JPH0983600A - Multilevel adaptive modulation radio equipment - Google Patents
Multilevel adaptive modulation radio equipmentInfo
- Publication number
- JPH0983600A JPH0983600A JP7260928A JP26092895A JPH0983600A JP H0983600 A JPH0983600 A JP H0983600A JP 7260928 A JP7260928 A JP 7260928A JP 26092895 A JP26092895 A JP 26092895A JP H0983600 A JPH0983600 A JP H0983600A
- Authority
- JP
- Japan
- Prior art keywords
- modulation
- circuit
- signal
- propagation path
- multilevel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003044 adaptive effect Effects 0.000 title claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 claims abstract description 44
- 230000003321 amplification Effects 0.000 claims description 35
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 35
- 238000013507 mapping Methods 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 2
- 238000011156 evaluation Methods 0.000 description 15
- 238000010586 diagram Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 5
- 238000000411 transmission spectrum Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005562 fading Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
Landscapes
- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
(57)【要約】
【課題】 送信電力増幅回路の電源効率がよい多値適応
変調無線装置を提供する。
【解決手段】 伝搬路状況が良くない場合は、変調多値
数が小さく且つコンステレーションの零点を交差しない
変調方式を利用するようにした上で、送信電力増幅回路
をバックオフの小さい状態で動作させるようにした。
Kind Code: A1 Abstract: A multilevel adaptive modulation radio apparatus in which the power supply efficiency of a transmission power amplifier circuit is good. When the propagation path condition is not good, a modulation method in which the number of modulation levels is small and the zero of the constellation is not crossed is used, and then the transmission power amplifier circuit is operated in a small backoff state. I was allowed to.
Description
【０００１】[0001]
【発明の属する技術分野】本願発明は、ＴＤＤ（Time D
ivision Duplex）通信方式のディジタル無線通信におい
て、受信した信号から伝搬路状況（すなわち回線の品
質）を推定し、この推定結果に応じて変調方式を自動的
に切替えて変調動作を行ない、その上で送信等を行なう
多値適応変調無線装置に関する。BACKGROUND OF THE INVENTION The present invention relates to a TDD (Time D
ivision Duplex) In the digital wireless communication of the communication method, the propagation path condition (that is, the quality of the line) is estimated from the received signal, and the modulation method is automatically switched according to the estimation result, and the modulation operation is performed. The present invention relates to a multilevel adaptive modulation wireless device that performs transmission and the like.
【０００２】[0002]
【従来の技術】受信信号と送信信号とを同一の周波数で
交互に送受信するＴＤＤ通信で用いる従来の多値適応変
調無線装置としては、例えば、スクウェア型多値ＱＡＭ
の変調多値数およびシンボルレート（すなわち伝送レー
ト）を伝搬路状況に応じて、自動的に切替える図４に示
すようなものが公表されている（電子情報通信学会技術
報告ＲＣＳ９４−６４）。なお、ＴＤＤ通信で用いられ
るこの種の多値適応変調無線装置は、以下の点に着目す
るものである。すなわち連続する受信信号と送信信号と
は、可逆性原理により、同じフェージング変動をしてい
る伝搬路を通るとみなせるので、受信信号から測定した
伝搬路のＣ／Ｎｏ（搬送波電力対雑音電力密度比）や遅
延スプレッドを用いて、次の送信タイミングにおける伝
搬路状況を推定できる点に着目するものである。2. Description of the Related Art A conventional multilevel adaptive modulation radio apparatus used in TDD communication for alternately transmitting and receiving a received signal and a transmitted signal is, for example, a square type multilevel QAM.
A method for automatically switching the modulation multi-valued number and the symbol rate (that is, the transmission rate) according to the state of the propagation path as shown in FIG. 4 has been published (Technical Report of the Institute of Electronics, Information and Communication Engineers RCS94-64). Note that this type of multilevel adaptive modulation wireless apparatus used in TDD communication focuses on the following points. That is, since the continuous reception signal and the transmission signal can be regarded as passing through the propagation path having the same fading fluctuation due to the reversibility principle, C / No (carrier power to noise power density ratio) of the propagation path measured from the reception signal. ) And the delay spread, it is possible to estimate the propagation path condition at the next transmission timing.
【０００３】図４において、受信部２は、送受信アンテ
ナ１で受信した受信信号に対し直交検波および復号等を
行ない受信データを得て、この受信データを送出する回
路部である。伝搬路推定回路３は、受信部２から受信ベ
ースバンド信号やＲＳＳＩ（Received Signal Strength
Indicator）等の受信レベル情報を取込み、これらを用
いて今回の受信タイミングにおけるＣ／Ｎｏや遅延スプ
レッド等を検出し、検出結果に基づいて次の送信タイミ
ングにおける伝搬路状況を推定し、推定結果である推定
信号を送出する回路である。In FIG. 4, a receiving section 2 is a circuit section for performing quadrature detection and decoding on a received signal received by the transmitting / receiving antenna 1 to obtain received data and transmitting the received data. The propagation path estimation circuit 3 receives a received baseband signal from the receiver 2 and an RSSI (Received Signal Strength).
Indicator) and other reception level information, and using them to detect C / No, delay spread, etc. at the current reception timing, and estimate the propagation path condition at the next transmission timing based on the detection result. It is a circuit for transmitting a certain estimation signal.
【０００４】変調レベル制御回路４は、上記伝搬路推定
回路３からの推定信号を入力し、この信号に基づいて、
上記伝搬路状況下で（すなわち推定した伝搬路状況下
で）、誤り率を所定値以下に保ちつつ、最大の情報速度
を得られる変調方式おびシンボルレートの組合わせを選
択して、この組合わせでの変調を指示する制御信号をシ
ンボルマッピング回路５に送出する回路部である。The modulation level control circuit 4 receives the estimation signal from the propagation path estimation circuit 3 and, based on this signal,
Under the above-mentioned channel conditions (that is, under the estimated channel conditions), a combination of the modulation method and the symbol rate that can obtain the maximum information rate while keeping the error rate below a predetermined value is selected, and this combination is selected. It is a circuit unit that sends a control signal for instructing modulation to the symbol mapping circuit 5.
【０００５】シンボルマッピング回路５は、与えられた
送信データを上記変調レベル制御回路４よりの制御信号
で指示された変調方式のシンボルにマッピングし、更に
上記制御信号で指示されたシンボルレート（伝送レー
ト）での複素ベースバンド信号を得て、この信号を直交
変調回路６に送出する回路部である。直交変調回路６
は、搬送波を上記シンボルマッピング回路５からの複素
ベースバンド信号により変調し、変調波を送信電力増幅
回路７に送出する回路部である。送信電力増幅回路７
は、線形すなわちＡ級の電力増幅器となっており、上記
直交変調回路６からの変調波を入力して、この変調波の
電力を増幅して出力する回路部である。この送信電力増
幅回路７で電力増幅された上記変調波は、送受信アンテ
ナ１より空間に輻射されることになる。The symbol mapping circuit 5 maps the given transmission data to the symbols of the modulation method instructed by the control signal from the modulation level control circuit 4, and further maps the symbol rate (transmission rate) instructed by the control signal. ) Is a circuit unit that obtains the complex baseband signal in (1) and sends this signal to the quadrature modulation circuit 6. Quadrature modulation circuit 6
Is a circuit unit that modulates a carrier wave with the complex baseband signal from the symbol mapping circuit 5 and sends a modulated wave to the transmission power amplifier circuit 7. Transmission power amplifier circuit 7
Is a linear or class A power amplifier, which is a circuit unit that receives the modulated wave from the quadrature modulation circuit 6 and amplifies and outputs the power of the modulated wave. The modulated wave power-amplified by the transmission power amplifier circuit 7 is radiated into space from the transmission / reception antenna 1.
【０００６】ところで、上記変調レベル制御回路４がシ
ンボルマッピング回路５に指示する各変調方式において
は、図５に示すように、変調多値数が大きくなる程、１
シンボル当りの情報量は増えるが、信頼度（伝搬路状況
が比較的劣悪でも誤り率を一定値以下に保てる度合）は
低下し、逆に変調多値数が小さくなる程、１シンボル当
りの情報量は減少するが、信頼度は向上する。すなわち
上記変調レベル制御回路４は、適応変調を実行するた
め、伝搬路状況が比較的劣悪であると判断されたとき
は、変調多値数が小さく信頼度が高い変調方式（伝搬状
況が最悪のときは、ダミーデータ伝送）を指示し、他
方、伝搬路状況が比較的良好であると判断されたとき
は、変調多値数が大きく信頼度が比較的低い変調方式を
指示する。このようにして伝搬状況に応じた適応変調を
行うことにより、ビットエラーレート等により見極めら
れる情報伝送の質が向上することになる。By the way, in each of the modulation methods instructed by the modulation level control circuit 4 to the symbol mapping circuit 5, as the modulation multi-value number becomes larger, as shown in FIG.
Although the amount of information per symbol increases, the reliability (the degree to which the error rate can be kept below a certain value even when the channel condition is relatively poor) decreases, and conversely, the smaller the number of modulation levels, the information per symbol decreases. Volume is reduced, but reliability is improved. That is, since the modulation level control circuit 4 executes adaptive modulation, when it is determined that the propagation path condition is relatively poor, the modulation method with a small number of modulation levels and high reliability (the propagation condition is the worst). If it is determined that the propagation path condition is relatively good, on the other hand, a modulation method with a large number of modulation levels and a relatively low reliability is instructed. By performing the adaptive modulation according to the propagation situation in this way, the quality of information transmission, which can be identified by the bit error rate or the like, is improved.
【０００７】[0007]
【発明が解決しようとする課題】ところで上記のような
従来の多値適応変調無線装置においては、上記送信電力
増幅回路７として、電源効率の点で劣るバックオフの大
きな線形電力増幅器（すなわちＡ級電力増幅器）を用い
ている。バックオフの大きな線形電力増幅器を用いる理
由は、バックオフの小さい飽和電力増幅器（たとえば、
ＡＢ級電力増幅器）を用いた場合には、変調波の包絡線
変動が大きいときに、スペクトラム歪みが発生し、この
歪みは多値ＱＡＭのような線形変調では送信信号の振幅
や位相の歪みを引起し、このような送信信号を受信した
受信側では、送信信号からの送信情報の抽出は、極めて
困難になるからである。図６は、上記理由を、一層、具
体的に説明するためのものであり、同図の（ａ）は、送
信電力増幅器としてバックオフが大きいＡ級電力増幅器
を用いた場合の送信スペクトラムを示し、また同図の
（ｂ）は、送信電力増幅増幅器としてバックオフが小さ
い例えばＡＢ級電力増幅器を用いた場合の送信スペトク
ラムを示している。上記（ａ）と（ｂ）の送信スペクト
ラムを比較すると（ｂ）の方は（バックオフが小さい
方）は、（ａ）の方（バックオフが大きい方）に比べて
サイドローブが盛上がっており、歪みが発生しているこ
とが分かる。この歪みの有無が、同図の（ｃ）および
（ｄ）に示すコンステレーション歪みの有無すなわち送
信信号の振幅や位相の歪みの有無につながるのである。
そして、上記（ｄ）に示すようなコンステレーション歪
みを持つ送信信号すなわち振幅や位相が歪んでいる送信
信号から送信情報を抽出することは極めて困難になるの
である。By the way, in the conventional multi-level adaptive modulation radio apparatus as described above, the transmission power amplification circuit 7 is a linear power amplifier with large back-off (that is, class A) inferior in power supply efficiency. Power amplifier). The reason for using a linear power amplifier with a large backoff is that a saturated power amplifier with a small backoff (for example,
When a class AB power amplifier is used, spectrum distortion occurs when the envelope variation of the modulated wave is large, and this distortion causes distortion of the amplitude or phase of the transmission signal in linear modulation such as multilevel QAM. This is because it becomes extremely difficult for the receiving side that receives such a transmission signal to extract the transmission information from the transmission signal. FIG. 6 is for explaining the above reason more concretely, and FIG. 6A shows a transmission spectrum when a class A power amplifier having a large backoff is used as the transmission power amplifier. Further, (b) of the figure shows a transmission spectrum when a class AB power amplifier having a small backoff is used as the transmission power amplification amplifier. Comparing the transmission spectra of (a) and (b) above, the side lobe of (b) (smaller backoff) is higher than that of (a) (larger backoff). It can be seen that distortion is occurring. The presence / absence of this distortion leads to the presence / absence of constellation distortion shown in (c) and (d) of the figure, that is, the presence / absence of distortion in the amplitude and phase of the transmission signal.
Then, it becomes extremely difficult to extract the transmission information from the transmission signal having the constellation distortion as shown in (d), that is, the transmission signal in which the amplitude and the phase are distorted.
【０００８】以上のような理由により、従来、上記送信
電力増幅回路７としてはバックオフの大きな線形電力増
幅を用いてきたが、これは、上述のように電源効率が悪
く、電力消費といった面で問題がある。For the above-mentioned reasons, conventionally, a linear power amplifier with a large backoff has been used as the transmission power amplifier circuit 7. However, this is inferior in power supply efficiency as described above and in terms of power consumption. There's a problem.
【０００９】本願発明は、上述のような事情に鑑みて、
なされたものであり、送信電力増幅回路を幾分でも電源
効率のよいものにすることができる多値適応変調無線装
置の提供を目的とする。The present invention has been made in view of the above circumstances.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a multilevel adaptive modulation radio apparatus that can make the transmission power amplification circuit somewhat efficient in power supply.
【００１０】[0010]
【課題を解決するための手段】請求項１の発明では、変
調に際しては伝搬路状況に応じて変調多値数の異なる複
数の変調方式のいずれかを選択し、選択した変調方式で
の変調動作を行なう多値適応変調無線装置を以下のよう
に構成した。According to a first aspect of the present invention, at the time of modulation, any one of a plurality of modulation methods having different modulation multi-value numbers is selected in accordance with the propagation path condition, and the modulation operation in the selected modulation method is performed. A multilevel adaptive modulation radio apparatus for performing the above is configured as follows.
【００１１】後述の制御回路の制御の下に、送信データ
を指定された変調多値数の変調方式のシンボルにマッピ
ングして、対応する複素ベースバンド信号を送出するシ
ンボルマッピング回路と、上記シンボルマッピング回路
よりの複素ベースバンド信号に基づき、直交変調を行な
う直交変調回路と、後述の制御回路の制御の下に、上記
直交変調回路よりの変調波の電力増幅を、指定されたバ
ックオフで行なう送信電力増幅回路と、受信信号に対し
て検波および復号の処理を加えて受信データを得て、こ
の受信データを出力する受信回路と、上記受信回路から
受信ベースバンド信号若しくは受信レベル情報の一方、
又はそれら両方を取込み、この取込んだ信号等に基づ
き、伝搬路状況を推定して、推定結果である推定信号を
送出する伝搬路推定回路と、上記伝搬路推定回路よりの
推定信号が、伝搬路状況は比較的悪いと推定するもので
あるときには、上記シンボルマッピング回路に対して、
変調多値数が４以下でコンステレーション（ディジタル
直交変調の信号配置図）の零点を交差しないように構成
した変調方式を指定すると共に、上記送信電力増幅回路
に対して、小さいバックオフでの動作を指定し、他方、
上記推定信号が、伝搬路状況は比較的良いと推定するも
のであるときには、上記シンボルマッピング回路に対し
て、変調多値数が４を越える変調方式を指定すると共
に、上記送信電力増幅回路に対して、線形領域のみを利
用する大きなバックオフでの動作を指定する制御回路と
を備える構成とした。Under the control of a control circuit, which will be described later, a symbol mapping circuit that maps transmission data to symbols of a specified modulation multi-level modulation scheme and sends a corresponding complex baseband signal, and the symbol mapping circuit. Transmission that performs power amplification of the modulated wave from the quadrature modulation circuit with specified backoff under the control of a quadrature modulation circuit that performs quadrature modulation based on a complex baseband signal from the circuit and a control circuit described later. A power amplifier circuit, to obtain received data by applying detection and decoding processing to the received signal, and to output this received data, and one of the received baseband signal or reception level information from the receiving circuit,
Or, both of them are taken in, the propagation path estimation circuit that estimates the propagation path situation based on the acquired signal, and sends out the estimation signal that is the estimation result, and the estimated signal from the propagation path estimation circuit When it is estimated that the road condition is relatively bad,
The modulation method is configured so that the number of modulation levels is 4 or less and does not cross the zero points of the constellation (digital quadrature modulation signal layout diagram), and the transmission power amplification circuit operates with a small backoff. , On the other hand,
When the estimated signal estimates that the channel condition is relatively good, the symbol mapping circuit specifies a modulation method in which the number of modulation levels exceeds 4, and the transmission power amplifier circuit is instructed. And a control circuit for designating a large back-off operation using only the linear region.
【００１２】請求項２の発明では、請求項１の発明に係
る多値適応変調無線装置の上記制御回路を、変調多値数
が４以下の変調方式としては、π／２シフトＢＰＳＫ
（π／２シフト２値位相変調）又はπ／４シフトＱＰＳ
Ｋ（π／４シフト直交位相変調）を選択的に指定し、変
調多値数が４を越える変調方式としては、π／４シフト
ＱＰＳＫとＡＳＫ（振幅変調）とを組合わせた方式又は
スター１６ＱＡＭ（スター１６値直交振幅変調）を選択
的に指定する回路とした。According to a second aspect of the present invention, the control circuit of the multilevel adaptive modulation radio apparatus according to the first aspect of the invention uses a π / 2 shift BPSK as a modulation method with a modulation multilevel number of 4 or less.
(Π / 2 shift binary phase modulation) or π / 4 shift QPS
As a modulation method in which K (π / 4 shift quadrature phase modulation) is selectively designated and the modulation multi-value number exceeds 4, a method combining π / 4 shift QPSK and ASK (amplitude modulation) or star 16QAM A circuit for selectively designating (star 16-valued quadrature amplitude modulation) is adopted.
【００１３】請求項３の発明では、請求項２の発明に係
る多値適応変調無線装置の上記制御回路を、変調多値数
が４を越える変調方式の１つとしてπ／４シフトＱＰＳ
ＫとＡＳＫとトレリス符号化変調とを組合わせた変調方
式をも指定する回路とした。According to a third aspect of the present invention, the control circuit of the multilevel adaptive modulation radio apparatus according to the second aspect of the invention uses π / 4 shift QPS as one of the modulation schemes in which the number of modulation multilevels exceeds four.
A circuit for designating a modulation method in which K, ASK, and trellis coded modulation are combined is also specified.
【００１４】請求項４の発明では、請求項１の発明に係
る多値適応変調無線装置の上記制御回路を、多値数が４
以下の変調方式としては、π／２シフトＢＰＳＫ又はＯ
ＱＰＳＫ（オフセット直交位相変調）を選択的に指定
し、変調多値数が４を越える変調方式としては、ＯＱＰ
ＳＫとＡＳＫを組合わせた方式又は１６ＱＡＭ（１６値
直交振幅変調）を選択的に指定する回路とした。According to a fourth aspect of the present invention, the control circuit of the multilevel adaptive modulation radio apparatus according to the first aspect of the invention has a multilevel number of four.
The following modulation methods include π / 2 shift BPSK or O
As a modulation method in which QPSK (offset quadrature phase modulation) is selectively specified and the number of modulation levels exceeds 4, OQP
A circuit in which SK and ASK are combined or 16QAM (16-value quadrature amplitude modulation) is selectively designated is used.
【００１５】[0015]
【発明の実施の形態】以下、本願発明の実施の形態によ
り、本願発明を具体的に説明する。図１は、本願発明の
実施の形態に係る多値適応変調無線装置の構成を示すも
のである。同図において、従来例を示す前記図４におけ
る回路部と同一符号が付されている回路部は、図４にお
ける回路部と同一構成および機能を備えるものとなって
いる。すなわち、図４における変調レベル制御回路４お
よび送信電力増幅回路７は、図１においては、それぞれ
制御回路１４および送信電力増幅回路１７に変更されて
いるが、他の回路部については、概ね変更はない。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be specifically described with reference to the embodiments of the present invention. FIG. 1 shows the configuration of a multilevel adaptive modulation radio apparatus according to an embodiment of the present invention. In the same figure, the circuit section given the same reference numeral as the circuit section in FIG. 4 showing the conventional example has the same configuration and function as the circuit section in FIG. That is, the modulation level control circuit 4 and the transmission power amplification circuit 7 in FIG. 4 are changed to the control circuit 14 and the transmission power amplification circuit 17 in FIG. 1, respectively, but the other circuit parts are almost unchanged. Absent.
【００１６】図１において、制御回路１４は、伝搬路推
定回路３からの前記推定信号を入力し、この信号に基づ
いて、その時点の伝搬路状況で（すなわち推定した伝搬
路状況下で）誤り率を所定値以下に保ちつつ、最大の情
報速度が得られる変調方式を選択して、この変調方式で
のマッピングを指示する制御信号をシンボルマッピング
回路５に送出すると共に、送信電力増幅回路１７にも制
御信号を送ってこの送信電力増幅回路１７の増幅動作に
おけるバックオフの大きさを指示する回路になってい
る。また図１における送信電力増幅回路１７は、直交変
調回路６からの変調波を入力して、これを制御回路１４
によって指示された大きさのバックオフでの電力増幅を
行なって送出する回路部となっている。In FIG. 1, the control circuit 14 receives the estimated signal from the propagation path estimation circuit 3 and, based on this signal, makes an error in the propagation path situation at that time (that is, under the estimated propagation path situation). While keeping the rate below a predetermined value, a modulation method that maximizes the information rate is selected, and a control signal for instructing mapping in this modulation method is sent to the symbol mapping circuit 5 and to the transmission power amplification circuit 17. Is also a circuit that sends a control signal to instruct the magnitude of backoff in the amplification operation of the transmission power amplification circuit 17. Further, the transmission power amplifier circuit 17 in FIG. 1 inputs the modulated wave from the quadrature modulation circuit 6 and outputs it to the control circuit 14.
It is a circuit unit for performing power amplification with a back-off of a size instructed by and sending out.
【００１７】以上のように構成された本実施の形態にお
いては、伝搬路推定回路３は伝搬路状況を悪い方から順
にＡ、Ｂ、Ｃ、Ｄ、Ｅの５段階に分けて評価する。例え
ば伝搬路状況が最も悪く評価がＡであるときは、このＡ
を示す推定信号を伝搬路推定回路３から与えられた制御
回路１４は、シンボルマッピング回路５に対し変調方式
として図２の（ａ）に示すπ／２シフトＢＰＳＫを指示
すると共に、送信電力増幅回路１７に対しては、バック
オフを小さくした状態での増幅動作を指示する。また伝
搬路状況が比較的悪く、評価がＢのときは、このＢを示
す推定信号を伝搬路推定回路３から与えられた制御回路
１４はシンボルマッピング回路５に対し、変調方式とし
て、図２の（ｂ）に示すπ／４シフトＱＰＳＫを指示す
ると共に、送信電力増幅回路１７に対してはバックオフ
を小さくした状態での増幅動作を指示する。In the present embodiment configured as described above, the propagation path estimation circuit 3 evaluates the propagation path situation in five stages of A, B, C, D and E in order from the bad one. For example, when the propagation path situation is the worst and the evaluation is A, this A
The control circuit 14, which is given from the propagation path estimation circuit 3 with the estimated signal indicating the above, instructs the symbol mapping circuit 5 to use the π / 2 shift BPSK shown in FIG. The amplifier 17 is instructed to perform the amplifying operation with the backoff being reduced. When the condition of the propagation path is relatively bad and the evaluation is B, the control circuit 14 provided with the estimated signal indicating this B from the propagation path estimation circuit 3 instructs the symbol mapping circuit 5 as a modulation method of FIG. In addition to instructing the π / 4 shift QPSK shown in (b), it instructs the transmission power amplification circuit 17 to perform an amplification operation in a state where the backoff is small.
【００１８】また、伝搬路状況が比較的良好で評価がＣ
のときは、このＣを示す推定信号を伝搬路推定回路３か
ら与えられた制御回路１４はシンボルマッピング回路５
に対し、変調方式として、図２の（ｃ）に示すπ／４シ
フトＱＰＳＫとＡＳＫとＴＣＭ（トレリス符号化変調）
を組合わせたものを指示すると共に、送信電力増幅回路
１７に対しては、バックオフを大きくした状態での増幅
動作を指示する。評価がＤのときは、制御回路１４はシ
ンボルマッピング回路５に対し、変調方式として、図２
の（ｄ）に示すπ／４シフトＱＰＳＫとＡＳＫとを組合
わせたものを指示すると共に、送信電力増幅回路１７に
対しては、バックオフを大きくした状態での増幅動作を
指示する。そして、伝搬状況が極めて良好で、評価がＥ
のときは、制御回路１４はシンボルマッピング回路５に
対して、変調方式として、図２の（ｅ）に示すスター型
１６ＱＡＭを指示すると共に、送信電力増幅回路１７に
対してはバックオフを大きくした状態での増幅動作を指
示する。The condition of the propagation path is relatively good and the evaluation is C
In the case of, the control circuit 14 given the estimated signal indicating C from the channel estimation circuit 3 causes the symbol mapping circuit 5
On the other hand, as a modulation method, π / 4 shift QPSK, ASK, and TCM (trellis coded modulation) shown in (c) of FIG. 2 are used.
And a command for the amplification operation in the state where the backoff is increased. When the evaluation is D, the control circuit 14 instructs the symbol mapping circuit 5 to use the modulation method shown in FIG.
In addition to instructing a combination of the π / 4 shift QPSK and ASK shown in (d), the transmission power amplification circuit 17 is instructed to perform an amplification operation in a state where the backoff is increased. And the propagation situation is very good and the evaluation is E
In this case, the control circuit 14 instructs the symbol mapping circuit 5 to use the star type 16QAM shown in (e) of FIG. 2 as the modulation method, and increases the backoff of the transmission power amplification circuit 17. Instructs the amplification operation in the state.
【００１９】以上のように、この実施の形態において
は、評価がＡまたはＢの場合のように伝搬路状況が良く
ない場合は、変調方式を多値数が小さく且つコンステレ
ーションの零点を交差しないものとし、その上で送信電
力増幅回路１７のバックオフを小さくしてこの送信電力
増幅回路１７にＡＢ級増幅動作をさせて高電源効率を実
現している。この場合、送信電力増幅回路１７のバック
オフを小さくできるのは、上記変調方式で変調した変調
波の振幅には変調情報が含まれないためである。また、
評価がＣ、ＤまたはＥの場合のように伝搬路状況が良い
ときは、従来の多値適応変調無線装置と同様で、この良
好の伝搬路状況を活用するために変調多値数の大きな変
調方式を用い、送信電力増幅回路１７にはバックオフの
大きな状態での増幅動作（例えばＡ級増幅動作）をさせ
ている。これは、変調多値数の大きな変調方式で変調し
た変調波では、振幅にも変調情報が含まれるので、線形
領域での増幅動作の確保が必要だからである（すなわち
従来例において送信電力増幅回路７にＡ級増幅動作をさ
せていた理由と同様の理由である）。As described above, in this embodiment, when the condition of the propagation path is not good such as when the evaluation is A or B, the modulation method has a small multi-valued number and does not cross the zero points of the constellation. On the other hand, the back-off of the transmission power amplification circuit 17 is reduced and the transmission power amplification circuit 17 is made to perform class AB amplification operation to realize high power supply efficiency. In this case, the backoff of the transmission power amplification circuit 17 can be reduced because the amplitude of the modulated wave modulated by the above-mentioned modulation method does not include modulation information. Also,
When the propagation path condition is good as in the case of evaluation of C, D or E, it is the same as the conventional multi-level adaptive modulation radio apparatus, and in order to utilize this good propagation path condition, the modulation with a large number of modulation levels is performed. By using this method, the transmission power amplification circuit 17 is made to perform an amplification operation (for example, class A amplification operation) in a state where the backoff is large. This is because, in a modulated wave modulated by a modulation method with a large modulation multi-valued number, since the amplitude also contains modulation information, it is necessary to secure an amplification operation in a linear region (that is, in the conventional example, a transmission power amplification circuit). (The reason is the same as the reason that the A class amplification operation is performed in 7.)
【００２０】以上のように、この実施の形態によれば、
伝搬路状況が比較的良くなく、信頼度を重視し、１シン
ボル当りのビット数を押さえて伝送を行なっているとき
には、送信電力増幅回路１７のバックオフを小さくし
て、この送信電力増幅回路１７の電源効率を高いものと
することができる。As described above, according to this embodiment,
When the propagation path condition is not relatively good, reliability is emphasized, and the number of bits per symbol is suppressed for transmission, the back-off of the transmission power amplification circuit 17 is reduced to reduce the transmission power amplification circuit 17. The power efficiency of can be made high.
【００２１】なお、本願発明は、上記実施の形態に限定
されるものでなく、本願発明の範囲で種々応用変形が可
能である。例えば、上記実施の形態では伝搬路状況を
Ａ、Ｂ、Ｃ、Ｄ、Ｅの５段階で評価し、この評価に応じ
て、図２に示す各変調方式を切替えて利用するものであ
ったが、伝搬路状況を悪い方から順に、Ａ、Ｂ、Ｃ、Ｄ
の４段階で評価し、この評価に応じて、図３に示す各変
調方式を切替えて利用するようにしてもよい。すなわち
評価がＡのときはπ／２シフトＢＰＳＫ、評価がＢのと
きはＯＱＰＳＫ、評価がＣのときはＯＱＰＳＫとＡＳＫ
を組合せたもの、評価が最良でＤのときは１６ＱＡＭと
いった具合に切替えて利用するようにしてもよい。な
お、このような変調方式の切替えにおいても、伝搬路状
況が悪いときは、コンステレーションの零点を交差しな
いように構成した変調多値数の小さい変調方式を利用し
ているので、送信電力増幅回路１７をバックオフの小さ
い状態で利用でき、この送信電力増幅回路１７の電源効
率を高いものとすることができる。The invention of the present application is not limited to the above-described embodiment, but various application modifications are possible within the scope of the invention of the present application. For example, in the above-described embodiment, the propagation path condition is evaluated in five stages of A, B, C, D, and E, and the modulation schemes shown in FIG. 2 are switched and used according to this evaluation. , A, B, C, D in order from the poorest propagation path condition
The evaluation may be performed in four stages, and the modulation methods shown in FIG. 3 may be switched and used according to the evaluation. That is, π / 2 shift BPSK when the evaluation is A, OQPSK when the evaluation is B, and OQPSK and ASK when the evaluation is C.
It is also possible to switch and use a combination such as 16 QAM when the evaluation is the best and the evaluation value is D. Even in such a switching of the modulation method, when the propagation path condition is bad, a modulation method with a small modulation multi-level number configured so as not to cross the zero points of the constellation is used. 17 can be used in a state where the backoff is small, and the power supply efficiency of this transmission power amplification circuit 17 can be made high.
【００２２】[0022]
【発明の効果】以上詳述したように、本願発明によれ
ば、送信電力増幅回路の電源効率を良くすることができ
る多値適応変調無線装置の提供を可能とする。As described in detail above, according to the present invention, it is possible to provide a multilevel adaptive modulation radio apparatus capable of improving the power supply efficiency of a transmission power amplifier circuit.
【図１】本願発明の実施の一形態の回路構成を示す図で
ある。FIG. 1 is a diagram showing a circuit configuration of an embodiment of the present invention.
【図２】上記実施の形態において切替えて利用される変
調方式を示す図である。FIG. 2 is a diagram showing a modulation method that is switched and used in the above embodiment.
【図３】応用変形例において切替えて利用される変調方
式を示す図である。FIG. 3 is a diagram showing a modulation method that is switched and used in an applied modification.
【図４】従来例の回路構成を示す図である。FIG. 4 is a diagram showing a circuit configuration of a conventional example.
【図５】従来例において切替えて利用される変調方式を
示す図である。FIG. 5 is a diagram showing a modulation method used by switching in a conventional example.
【図６】従来例においてＡ級電力増幅器が用いられる理
由を説明するための図である。FIG. 6 is a diagram for explaining the reason why a class A power amplifier is used in a conventional example.
１ 送信アンテナ ２ 受信部 ３ 伝搬路推定回路 ４ 変調レベル制御回路 ５ シンボルマッピング回路 ６ 直交変調回路 ７ 送信電力増幅回路 １４ 制御回路 １７ 送信電力増幅回路 DESCRIPTION OF SYMBOLS 1 transmission antenna 2 reception part 3 propagation path estimation circuit 4 modulation level control circuit 5 symbol mapping circuit 6 quadrature modulation circuit 7 transmission power amplification circuit 14 control circuit 17 transmission power amplification circuit
Claims (4)
変調多値数の異なる複数の変調方式のいずれかを選択
し、選択した変調方式での変調動作を行なう多値適応変
調無線装置において、 後述の制御回路の制御の下に、送信データを指定された
変調多値数の変調方式のシンボルにマッピングして、対
応する複素ベースバンド信号を送出するシンボルマッピ
ング回路と、 上記シンボルマッピング回路よりの複素ベースバンド信
号に基づき、直交変調を行なう直交変調回路と、 後述の制御回路の制御の下に、上記直交変調回路よりの
変調波の電力増幅を、指定されたバックオフで行なう送
信電力増幅回路と、 受信信号に対して検波および復号の処理を加えて受信デ
ータを得て、この受信データを出力する受信回路と、 上記受信回路から受信ベースバンド信号若しくは受信レ
ベル情報の一方、又はそれら両方を取込み、この取込ん
だ信号等に基づき、伝搬路状況を推定して、推定結果で
ある推定信号を送出する伝搬路推定回路と、 上記伝搬路推定回路よりの推定信号が、伝搬路状況は比
較的悪いと推定するものであるときには、上記シンボル
マッピング回路に対して、変調多値数が４以下で且つコ
ンステレーションの零点を交差しないように構成した変
調方式を指定すると共に、上記送信電力増幅回路に対し
て、小さいバックオフでの動作を指定し、他方、上記推
定信号が、伝搬路状況は比較的良いと推定するものであ
るときには、上記シンボルマッピング回路に対して、変
調多値数が４を越える変調方式を指定すると共に、上記
送信電力増幅回路に対して、線形領域のみを利用する大
きなバックオフでの動作を指定する制御回路とを備える
ことを特徴とする多値適応変調無線装置。1. At the time of modulation, depending on the state of the propagation path,
In a multilevel adaptive modulation wireless device that selects one of multiple modulation methods with different multilevel values and performs the modulation operation in the selected modulation method, the transmission data is specified under the control of the control circuit described later. And a quadrature modulation circuit that performs quadrature modulation based on the complex baseband signal from the symbol mapping circuit. Under the control of the control circuit described later, a transmission power amplification circuit that amplifies the power of the modulated wave from the quadrature modulation circuit with a specified back-off, and adds detection and decoding processing to the received signal. One of the receiving circuit that receives the received data and outputs the received data, and the receiving baseband signal or the receiving level information from the receiving circuit, or the receiving circuit. Both of these are taken in, and the propagation path estimation circuit that estimates the propagation path situation based on the acquired signal and sends out the estimation signal that is the estimation result, and the estimation signal from the propagation path estimation circuit When it is estimated that the situation is relatively bad, the modulation method which is configured so that the modulation multi-value number is 4 or less and does not cross the constellation zero point is specified for the symbol mapping circuit, and the transmission is performed. When the operation with a small backoff is specified for the power amplifier circuit, while the estimated signal estimates that the channel condition is relatively good, the modulation multi-level signal is supplied to the symbol mapping circuit. And a control circuit for designating a modulation method in which the number exceeds 4 and for designating a large back-off operation using only the linear region for the transmission power amplification circuit. Multilevel adaptive modulation wireless device, characterized in that.
変調方式としては、π／２シフトＢＰＳＫ又はπ／４シ
フトＱＰＳＫを選択的に指定し、変調多値数が４を越え
る変調方式としては、π／４シフトＱＰＳＫとＡＳＫと
を組合わせた方式又はスター１６ＱＡＭを選択的に指定
する回路であることを特徴とする請求項１記載の多値適
応変調無線装置。2. The control circuit selectively designates π / 2 shift BPSK or π / 4 shift QPSK as a modulation method with a modulation multi-value number of 4 or less, and a modulation with a modulation multi-value number exceeding 4 is performed. 2. The multilevel adaptive modulation radio apparatus according to claim 1, wherein the system is a system combining π / 4 shift QPSK and ASK or a circuit for selectively designating a star 16QAM.
る変調方式の１つとしてπ／４シフトＱＰＳＫとＡＳＫ
とトレリス符号化変調とを組合わせた変調方式をも指定
する回路であることを特徴とする請求項２記載の多値適
応変調無線装置。3. The control circuit uses π / 4 shift QPSK and ASK as one of the modulation schemes in which the number of modulation levels exceeds 4.
3. The multilevel adaptive modulation wireless apparatus according to claim 2, wherein the circuit is a circuit that also specifies a modulation method in which the above and trellis coded modulation are combined.
変調方式としては、π／２シフトＢＰＳＫ又はＯＱＰＳ
Ｋを選択的に指定し、変調多値数が４を越える変調方式
としては、ＯＱＰＳＫとＡＳＫを組合わせた方式又は１
６ＱＡＭを選択的に指定する回路であることを特徴とす
る請求項１記載の多値適応変調無線装置。4. The control circuit uses π / 2 shift BPSK or OQPS as a modulation method with a modulation multi-value number of 4 or less.
As a modulation method in which K is selectively designated and the number of modulation levels exceeds 4, a method combining OQPSK and ASK or 1 is used.
2. The multilevel adaptive modulation radio apparatus according to claim 1, which is a circuit for selectively designating 6QAM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7260928A JPH0983600A (en) | 1995-09-14 | 1995-09-14 | Multilevel adaptive modulation radio equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7260928A JPH0983600A (en) | 1995-09-14 | 1995-09-14 | Multilevel adaptive modulation radio equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0983600A true JPH0983600A (en) | 1997-03-28 |
Family
ID=17354722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7260928A Pending JPH0983600A (en) | 1995-09-14 | 1995-09-14 | Multilevel adaptive modulation radio equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0983600A (en) |
Cited By (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6434201B1 (en) | 1998-03-02 | 2002-08-13 | Nec Corporation | Simply-constructed digital radio communication system capable of changing transmission capacity mode |
| JP2003218789A (en) * | 2000-06-26 | 2003-07-31 | Matsushita Electric Ind Co Ltd | Base station device, communication terminal device and communication method |
| JP2003258927A (en) * | 2002-02-27 | 2003-09-12 | Toshiba Corp | Wireless communication device, wireless processing device, and modulation / demodulation processing device |
| WO2003085862A1 (en) * | 2002-04-05 | 2003-10-16 | Mitsubishi Denki Kabushiki Kaisha | Base station and communication system |
| JP2004056734A (en) * | 2002-07-24 | 2004-02-19 | Denso Corp | In-vehicle wireless communication device |
| JP2006041959A (en) * | 2004-07-27 | 2006-02-09 | Kyocera Corp | COMMUNICATION DEVICE, TRANSMISSION POWER DETERMINING METHOD, AND PROGRAM |
| JP2006508555A (en) * | 2002-03-21 | 2006-03-09 | エルジー エレクトロニクス インコーポレイティド | Signal transmission method and apparatus in mobile communication system |
| JP2006115161A (en) * | 2004-10-14 | 2006-04-27 | Nippon Antenna Co Ltd | Transmission equipment |
| JP2006262538A (en) * | 2006-06-26 | 2006-09-28 | Matsushita Electric Ind Co Ltd | Data transmission device |
| WO2006112292A1 (en) * | 2005-04-13 | 2006-10-26 | Ntt Docomo, Inc. | Mobile communication system, mobile station, base station, and communication control method |
| JP2006524930A (en) * | 2003-04-29 | 2006-11-02 | エルジー エレクトロニクス インコーポレイティド | Signal transmission method in mobile communication system |
| WO2007037008A1 (en) * | 2005-09-29 | 2007-04-05 | Fujitsu Limited | Transmitting/receiving apparatus and transmitting/receiving method |
| US7221648B2 (en) | 2000-11-29 | 2007-05-22 | Lucent Technologies Inc. | Rate adaptation in a wireless communication system |
| JP2007522746A (en) * | 2004-02-13 | 2007-08-09 | トムソン ライセンシング | Wireless transmitter with reduced power consumption |
| JP2008104206A (en) * | 1997-11-03 | 2008-05-01 | Qualcomm Inc | Method and apparatus for high rate packet data transmission |
| JP2009060638A (en) * | 2008-09-26 | 2009-03-19 | Kyocera Corp | Radio transmission apparatus, transmission power control method, and transmission power control program |
| JP2009239958A (en) * | 1997-06-16 | 2009-10-15 | Interdigital Technol Corp | Subscriber unit of wireless digital code division multiple access (cdma) communication system |
| JP2009545207A (en) * | 2006-07-20 | 2009-12-17 | アルカテル−ルーセント ユーエスエー インコーポレーテッド | Method and apparatus for generation and detection of optical difference variable multilevel phase shift keying (ODVMPSK / PAM) signal by pulse amplitude modulation |
| JP2009296655A (en) * | 1999-07-28 | 2009-12-17 | Panasonic Corp | Transmitting method and device |
| US7693179B2 (en) | 2002-11-29 | 2010-04-06 | Panasonic Corporation | Data transmission apparatus using a constellation rearrangement |
| JP2010093819A (en) * | 1997-10-14 | 2010-04-22 | Wi-Lan Inc | Method and apparatus for maintaining predefined transmission quality in wireless man network |
| JP2010114931A (en) * | 2010-01-18 | 2010-05-20 | Kyocera Corp | Communicating device, transmitting-power determining method, and program |
| KR100968665B1 (en) * | 2005-09-07 | 2010-07-06 | 닛본 덴끼 가부시끼가이샤 | Adaptive radio / modulation device, receiver, radio communication system and radio communication method |
| JP2011130478A (en) * | 2011-02-02 | 2011-06-30 | Kyocera Corp | Communication apparatus, transmission power determining method and program |
| WO2011118546A1 (en) * | 2010-03-24 | 2011-09-29 | 日本電気株式会社 | Communication device, communication system, and communication control method |
| JP2011234395A (en) * | 2011-06-27 | 2011-11-17 | Kyocera Corp | Base station apparatus and communication method |
| JP2012528507A (en) * | 2009-05-29 | 2012-11-12 | アルカテル−ルーセント | Transmitter for multiple format data |
| US9107109B2 (en) | 2000-10-25 | 2015-08-11 | Qualcomm Incorporated | Method and apparatus for determining a data rate in a high rate packet data wireless communications system |
| JPWO2023148979A1 (en) * | 2022-02-07 | 2023-08-10 |
-
1995
- 1995-09-14 JP JP7260928A patent/JPH0983600A/en active Pending
Cited By (58)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7710927B2 (en) | 1997-06-16 | 2010-05-04 | Interdigital Technology Corporation | Method for using a base station to selectively utilize B and D channels to support a plurality of communications |
| US9614610B2 (en) | 1997-06-16 | 2017-04-04 | Interdigital Technology Corporation | Method for using a base station to selectively utilize channels to support a plurality of communications |
| US9345025B2 (en) | 1997-06-16 | 2016-05-17 | Interdigital Technology Corporation | Method for using a base station to selectively utilize channels to support a plurality of communications |
| US9019940B2 (en) | 1997-06-16 | 2015-04-28 | Interdigital Technology Corporation | Method for using a base station to selectively utilize channels to support a plurality of communications |
| US8619722B2 (en) | 1997-06-16 | 2013-12-31 | Interdigital Technology Corporation | Method for using a base station to selectively utilize B and D channels to support a plurality of communications |
| US8300607B2 (en) | 1997-06-16 | 2012-10-30 | Interdigital Technology Corporation | Method for using a base station to selectively utilize B and D channels to support a plurality of communications |
| JP2009239958A (en) * | 1997-06-16 | 2009-10-15 | Interdigital Technol Corp | Subscriber unit of wireless digital code division multiple access (cdma) communication system |
| US8054916B2 (en) | 1997-06-16 | 2011-11-08 | Interdigital Technology Corporation | Method for using a base station to selectively utilize B and D channels to support a plurality of communications |
| JP2009284503A (en) * | 1997-06-16 | 2009-12-03 | Interdigital Technol Corp | Wireless digital code division multiple access (cdma) communication system |
| JP2010093819A (en) * | 1997-10-14 | 2010-04-22 | Wi-Lan Inc | Method and apparatus for maintaining predefined transmission quality in wireless man network |
| JP2010110010A (en) * | 1997-11-03 | 2010-05-13 | Qualcomm Inc | Method and apparatus for high rate packet data transmission |
| JP2010110009A (en) * | 1997-11-03 | 2010-05-13 | Qualcomm Inc | Method and apparatus for high rate packet data transmission |
| JP2008104206A (en) * | 1997-11-03 | 2008-05-01 | Qualcomm Inc | Method and apparatus for high rate packet data transmission |
| JP2010193459A (en) * | 1997-11-03 | 2010-09-02 | Qualcomm Inc | Method and apparatus for transmission of high rate packet data |
| JP2009153170A (en) * | 1997-11-03 | 2009-07-09 | Qualcomm Inc | Method and apparatus for high rate packet data transmission |
| US6434201B1 (en) | 1998-03-02 | 2002-08-13 | Nec Corporation | Simply-constructed digital radio communication system capable of changing transmission capacity mode |
| US8295399B2 (en) | 1999-07-28 | 2012-10-23 | Panasonic Corporation | Transmission apparatus, reception apparatus and digital radio communication method |
| US9106486B2 (en) | 1999-07-28 | 2015-08-11 | Wi-Fi One, Llc | Transmission apparatus, reception apparatus and digital radio communication method |
| JP2011030263A (en) * | 1999-07-28 | 2011-02-10 | Panasonic Corp | Method and apparatus for generating transmission signal |
| US9525575B2 (en) | 1999-07-28 | 2016-12-20 | Wi-Fi One, Llc | Transmission apparatus, reception apparatus and digital radio communication method |
| US10270631B2 (en) | 1999-07-28 | 2019-04-23 | WiFi One, LLC | Transmission apparatus, reception apparatus and digital radio communication method |
| JP2009296655A (en) * | 1999-07-28 | 2009-12-17 | Panasonic Corp | Transmitting method and device |
| US10498571B2 (en) | 1999-07-28 | 2019-12-03 | Wi-Fi One, Llc | Transmission apparatus, reception apparatus and digital radio communication method |
| JP2003218789A (en) * | 2000-06-26 | 2003-07-31 | Matsushita Electric Ind Co Ltd | Base station device, communication terminal device and communication method |
| US9107109B2 (en) | 2000-10-25 | 2015-08-11 | Qualcomm Incorporated | Method and apparatus for determining a data rate in a high rate packet data wireless communications system |
| US7221648B2 (en) | 2000-11-29 | 2007-05-22 | Lucent Technologies Inc. | Rate adaptation in a wireless communication system |
| US7697565B2 (en) | 2001-02-21 | 2010-04-13 | Panasonic Corporation | Data transmission apparatus and communication system using a constellation rearrangement |
| JP2003258927A (en) * | 2002-02-27 | 2003-09-12 | Toshiba Corp | Wireless communication device, wireless processing device, and modulation / demodulation processing device |
| US7324792B2 (en) | 2002-03-21 | 2008-01-29 | Lg Electronics Inc. | Apparatus and method for transmitting signal in mobile communication system |
| JP2006508555A (en) * | 2002-03-21 | 2006-03-09 | エルジー エレクトロニクス インコーポレイティド | Signal transmission method and apparatus in mobile communication system |
| WO2003085862A1 (en) * | 2002-04-05 | 2003-10-16 | Mitsubishi Denki Kabushiki Kaisha | Base station and communication system |
| JP2004056734A (en) * | 2002-07-24 | 2004-02-19 | Denso Corp | In-vehicle wireless communication device |
| US7693179B2 (en) | 2002-11-29 | 2010-04-06 | Panasonic Corporation | Data transmission apparatus using a constellation rearrangement |
| JP2006524930A (en) * | 2003-04-29 | 2006-11-02 | エルジー エレクトロニクス インコーポレイティド | Signal transmission method in mobile communication system |
| US7515649B2 (en) | 2003-04-29 | 2009-04-07 | Lg Electronics Inc. | Signal transmitting method in mobile communication system |
| JP2007522746A (en) * | 2004-02-13 | 2007-08-09 | トムソン ライセンシング | Wireless transmitter with reduced power consumption |
| JP2006041959A (en) * | 2004-07-27 | 2006-02-09 | Kyocera Corp | COMMUNICATION DEVICE, TRANSMISSION POWER DETERMINING METHOD, AND PROGRAM |
| JP2006115161A (en) * | 2004-10-14 | 2006-04-27 | Nippon Antenna Co Ltd | Transmission equipment |
| JP2006319940A (en) * | 2005-04-13 | 2006-11-24 | Ntt Docomo Inc | Mobile communication system, mobile station, base station, and communication control method |
| US8320382B2 (en) | 2005-04-13 | 2012-11-27 | Ntt Docomo, Inc. | Mobile communication system, a mobile station, a base station and communication control method |
| WO2006112292A1 (en) * | 2005-04-13 | 2006-10-26 | Ntt Docomo, Inc. | Mobile communication system, mobile station, base station, and communication control method |
| KR100968665B1 (en) * | 2005-09-07 | 2010-07-06 | 닛본 덴끼 가부시끼가이샤 | Adaptive radio / modulation device, receiver, radio communication system and radio communication method |
| JP4867918B2 (en) * | 2005-09-07 | 2012-02-01 | 日本電気株式会社 | Adaptive radio / modulation apparatus, reception apparatus, radio communication system, and radio communication method |
| US7961800B2 (en) | 2005-09-07 | 2011-06-14 | Nec Corporation | Adaptive radio/modulation apparatus, receiver apparatus, wireless communication system, and wireless communication method |
| WO2007037008A1 (en) * | 2005-09-29 | 2007-04-05 | Fujitsu Limited | Transmitting/receiving apparatus and transmitting/receiving method |
| JP2006262538A (en) * | 2006-06-26 | 2006-09-28 | Matsushita Electric Ind Co Ltd | Data transmission device |
| JP2009545207A (en) * | 2006-07-20 | 2009-12-17 | アルカテル−ルーセント ユーエスエー インコーポレーテッド | Method and apparatus for generation and detection of optical difference variable multilevel phase shift keying (ODVMPSK / PAM) signal by pulse amplitude modulation |
| JP2011160478A (en) * | 2006-07-20 | 2011-08-18 | Alcatel-Lucent Usa Inc | Method and apparatus for generation and detection of optical differential varied-multilevel phase-shift keying with pulse amplitude modulation (odvmpsk/pam) signal |
| JP2009060638A (en) * | 2008-09-26 | 2009-03-19 | Kyocera Corp | Radio transmission apparatus, transmission power control method, and transmission power control program |
| JP2012528507A (en) * | 2009-05-29 | 2012-11-12 | アルカテル−ルーセント | Transmitter for multiple format data |
| JP2010114931A (en) * | 2010-01-18 | 2010-05-20 | Kyocera Corp | Communicating device, transmitting-power determining method, and program |
| US9113425B2 (en) | 2010-03-24 | 2015-08-18 | Nec Corporation | Communication device, a communication system and a communication control method |
| JP5472448B2 (en) * | 2010-03-24 | 2014-04-16 | 日本電気株式会社 | COMMUNICATION DEVICE, COMMUNICATION SYSTEM, AND COMMUNICATION CONTROL METHOD |
| WO2011118546A1 (en) * | 2010-03-24 | 2011-09-29 | 日本電気株式会社 | Communication device, communication system, and communication control method |
| JP2011130478A (en) * | 2011-02-02 | 2011-06-30 | Kyocera Corp | Communication apparatus, transmission power determining method and program |
| JP2011234395A (en) * | 2011-06-27 | 2011-11-17 | Kyocera Corp | Base station apparatus and communication method |
| JPWO2023148979A1 (en) * | 2022-02-07 | 2023-08-10 | ||
| WO2023148979A1 (en) * | 2022-02-07 | 2023-08-10 | 日本電信電話株式会社 | Wireless communication method, wireless communication system, and wireless transmission device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0983600A (en) | Multilevel adaptive modulation radio equipment | |
| US8189701B2 (en) | Adaptive modulation scheme and data rate control method | |
| US7953177B2 (en) | Radio communication apparatus capable of switching modulation schemes | |
| US10498571B2 (en) | Transmission apparatus, reception apparatus and digital radio communication method | |
| EP0963074B1 (en) | Estimation of constellation size for adaptive modulation system | |
| US7254167B2 (en) | Constellation-multiplexed transmitter and receiver | |
| US7298784B2 (en) | Reception method, reception apparatus and wireless transmission system using adaptive modulation scheme | |
| CN100490367C (en) | base station device and terminal device | |
| CN1214586C (en) | Anti-fading Multilevel Quadrature Amplitude Modulation Receiver | |
| US20080170636A1 (en) | Apparatus and method for reducing peak-to-average power ratio in a wireless communication system | |
| US20040237016A1 (en) | Transmission/reception apparatus and transmission/reception method | |
| CN100571231C (en) | Radio communication system and its demodulation method and data rate control method | |
| US20060034384A1 (en) | Method and system for communicating data frames | |
| JPH1093650A (en) | Transceiver with variable modulation parameter adaptive modulation scheme | |
| US20040180695A1 (en) | Site diversity transmission/reception apparatus, base station, and mobile station | |
| US20070127360A1 (en) | Method of adaptive transmission in an orthogonal frequency division multiplexing system with multiple antennas | |
| US20090270052A1 (en) | Apparatus and method for radio transmission | |
| US7031397B1 (en) | Communication system with reduced power variation and method therefor | |
| CN1917497B (en) | A method for multiple-input multiple-output OFDM link adaptation based on capacity | |
| US7565114B2 (en) | Transmitter apparatus, receiver apparatus, and radio communication system | |
| JP4918935B2 (en) | Adaptive modulation method and data rate control method | |
| CN100364253C (en) | Method for Subband Adaptive Turbo Coding Modulation in OFDM | |
| US20100150272A1 (en) | Wireless communications device for signal with selected data symbol mapping and related methods | |
| JP3980017B2 (en) | Transmitting apparatus and communication method | |
| Shraddha | Performance Analysis of Spatial Modulation Scheme in Wireless Communication |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20040309 |