JPH0856184A - Distortion compensation system for transmitter - Google Patents
Distortion compensation system for transmitterInfo
- Publication number
- JPH0856184A JPH0856184A JP19024094A JP19024094A JPH0856184A JP H0856184 A JPH0856184 A JP H0856184A JP 19024094 A JP19024094 A JP 19024094A JP 19024094 A JP19024094 A JP 19024094A JP H0856184 A JPH0856184 A JP H0856184A
- Authority
- JP
- Japan
- Prior art keywords
- distortion
- frequency
- transmission
- distortion component
- signal
- 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
- 230000005540 biological transmission Effects 0.000 claims abstract description 51
- 238000012360 testing method Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 11
- 230000003321 amplification Effects 0.000 description 13
- 238000003199 nucleic acid amplification method Methods 0.000 description 13
- 238000005259 measurement Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transmitters (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は複数の送信信号を送信ア
ンテナから放射する送信装置の歪み補償方式に関し、特
に上記送信信号の相互変調歪みを改善する送信装置の歪
み補償方式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distortion compensating method for a transmitting apparatus that radiates a plurality of transmitting signals from a transmitting antenna, and more particularly to a distortion compensating method for a transmitting apparatus that improves intermodulation distortion of the transmitting signals.
【０００２】[0002]
【従来の技術】従来のこの種の送信装置の歪み補償方式
について図面を参照して説明する。2. Description of the Related Art A conventional distortion compensation method for a transmitter of this type will be described with reference to the drawings.
【０００３】図３は従来の送信装置のブロック図であ
る。また、図２は、この従来技術による送信装置を含
め、本発明に関わる共通増幅部２のブロック図である。
この送信装置は、公開特許公報，平３−１０８２５号
（発明の名称：無線装置）に開示されたと基本的には同
じ技術を用いている。FIG. 3 is a block diagram of a conventional transmitter. Further, FIG. 2 is a block diagram of the common amplifying unit 2 according to the present invention including the transmitting device according to the conventional technique.
This transmitting device basically uses the same technology as disclosed in Japanese Patent Laid-Open Publication No. Hei 3-10825 (title of the invention: wireless device).
【０００４】図３の送信装置は８００ＭＨｚ帯あるいは
１．５ＧＨｚ帯を複数の無線チャネルに周波数分割して
通信する移動体通信システムの基地局装置である。送信
機部１は、使用無線チャネルにそれぞれ対応するｎ（ｎ
は２以上の整数）台の送信機（ＴＸ）１−１，１−２，
…，１−ｎを備え、上記各送信機が出力する高周波数信
号を合成した高周波数信号１０１を生じる。高周波数信
号１０１は共通増幅部２に供給される。また、送信機１
−ｉ（ｉは１からｎまでの任意の整数）の各各は、高周
波数信号を出力している稼働期間中には、その高周波数
信号の周波数を示す周波数指定信号１０７を制御部５に
送る。The transmitting apparatus of FIG. 3 is a base station apparatus of a mobile communication system for performing frequency division communication of a 800 MHz band or a 1.5 GHz band into a plurality of radio channels. The transmitter unit 1 uses n (n
Is an integer of 2 or more) transmitters (TX) 1-1, 1-2,
, 1-n, the high-frequency signal 101 is generated by combining the high-frequency signals output from the transmitters. The high frequency signal 101 is supplied to the common amplification unit 2. Also, transmitter 1
Each of −i (i is an arbitrary integer from 1 to n) outputs to the control unit 5 the frequency designation signal 107 indicating the frequency of the high frequency signal during the operation period in which the high frequency signal is output. send.
【０００５】共通増幅部２は、高周波数信号１０１を共
通増幅し、送信信号１０２ａを生じる。共通増幅部２内
の高周波数信号１０１を増幅する共通増幅器２４には非
直線歪みの発生を無視し得ないので、送信信号１０２ａ
には各送信機１−ｉの高周波数信号がそれぞれ相互変調
された信号成分が複数含まれている。そこで、共通増幅
部２には、共通増幅器２４により発生する非直線歪みを
軽減するために、電力分配器２１，遅延線２２，電力合
成器２３，歪発生器２５，可変位相器２６および可変減
衰器２７からなるプリディストーション型の歪補償回路
を共通増幅器２４の前段に備えている（図２参照）。こ
の歪み補償回路は、共通増幅器２４で発生する歪み成分
と逆相かつ等レベルの歪みを発生することにより、共通
増幅器２４との間で互いの歪み成分を相殺して送信信号
１０２ａの含む相互変調歪み成分を低減することができ
る。The common amplifier 2 commonly amplifies the high frequency signal 101 to generate a transmission signal 102a. Since the occurrence of nonlinear distortion cannot be ignored in the common amplifier 24 that amplifies the high frequency signal 101 in the common amplification unit 2, the transmission signal 102a
Contains a plurality of signal components obtained by intermodulating the high frequency signals of each transmitter 1-i. Therefore, in the common amplification unit 2, in order to reduce the non-linear distortion generated by the common amplifier 24, the power distributor 21, the delay line 22, the power combiner 23, the distortion generator 25, the variable phase shifter 26, and the variable attenuation. A pre-distortion type distortion compensating circuit composed of a device 27 is provided in a stage preceding the common amplifier 24 (see FIG. 2). The distortion compensating circuit generates distortion having a phase opposite to and equal to that of the distortion component generated in the common amplifier 24, thereby canceling the mutual distortion components with the common amplifier 24 and intermodulation included in the transmission signal 102a. The distortion component can be reduced.
【０００６】送信信号１０２ａは方向性結合器７に送ら
れて分岐され、大部分の送信信号１０２ｂは信号帯域を
規定値以下に制限する帯域通過ろ波器３を介してさらに
送信アンテナ４に送られ、その帯域制限後の送信信号１
０３ａが送信アンテナ４から送信電波として放射され
る。方向性結合器７で分岐された送信信号１０２ａの一
方，１０２ｃは歪み検出部８に送られる。The transmission signal 102a is sent to the directional coupler 7 and branched, and most of the transmission signal 102b is further sent to the transmission antenna 4 via the bandpass filter 3 which limits the signal band to a specified value or less. And the transmission signal 1 after the band limitation
03a is radiated from the transmission antenna 4 as a transmission radio wave. One of the transmission signals 102a and 102c branched by the directional coupler 7 is sent to the distortion detector 8.
【０００７】次に、この送信装置における相互変調歪み
の補償動作について説明する。Next, the operation of compensating for intermodulation distortion in this transmitter will be described.
【０００８】制御部５は、送信機部１から受けた周波数
指定信号１０７により、共通増幅部２で発生する相互変
調歪み成分の周波数を計算する。例えば、周波数Ａの高
周波数信号を出力する送信機１−１と周波数Ｂの高周波
数信号を出力する送信機１−２とが稼働していると、周
波数（２Ａ−Ｂ）および周波数（２Ｂ−Ａ）の相互変調
歪み成分が発生する。制御部５は、上記相互変調歪み成
分の周波数が別の送信機１−ｉの出力する高周波数信号
と同じ場合にはこの周波数を除き、計算した相互変調歪
み成分周波数の少くとも一つを示す測定周波数指定信号
１０５を歪み検出部８に送る。The control unit 5 calculates the frequency of the intermodulation distortion component generated in the common amplification unit 2 based on the frequency designation signal 107 received from the transmitter unit 1. For example, when the transmitter 1-1 that outputs a high frequency signal of frequency A and the transmitter 1-2 that outputs a high frequency signal of frequency B are operating, the frequency (2A-B) and the frequency (2B- The intermodulation distortion component of A) is generated. When the frequency of the intermodulation distortion component is the same as the high frequency signal output from another transmitter 1-i, the control unit 5 excludes this frequency and indicates at least one of the calculated intermodulation distortion component frequencies. The measurement frequency designation signal 105 is sent to the distortion detector 8.
【０００９】歪み検出部８は、測定周波数指定信号１０
５の指示する周波数の信号レベル，つまり相互変調歪み
成分のレベルを測定する。制御部５は、歪み検出部８の
測定する相互変調歪み成分レベルをモニタしながら、共
通増幅部２の歪み補償回路を歪み補償制御信号１０６ａ
により制御する。即ち、制御部５は、上記相互変調歪み
成分レベルが予め定めた所定値以下になるように、補償
制御信号１０６ａにより可変移相器２６および可変減衰
器２７を制御する。The distortion detector 8 is provided with a measurement frequency designation signal 10
The signal level of the frequency designated by 5, that is, the level of the intermodulation distortion component is measured. The control unit 5 monitors the level of the intermodulation distortion component measured by the distortion detection unit 8 and controls the distortion compensation circuit of the common amplification unit 2 to perform the distortion compensation control signal 106a.
Controlled by. That is, the control unit 5 controls the variable phase shifter 26 and the variable attenuator 27 by the compensation control signal 106a so that the intermodulation distortion component level becomes equal to or lower than a predetermined value.
【００１０】[0010]
【発明が解決しようとする課題】上述した従来の送信装
置の歪み補償方式は、共通増幅部の出力端における送信
信号の相互変調歪み成分のレベルを歪み補償の基礎デー
タとしているため、実際の送信装置において、共通増幅
部からさらに後段に配置される帯域通過ろ波器および送
信アンテナで発生する相互変調歪みを補償することがで
きず、システム運用において、送信信号の相互変調歪み
が規定値より大きくなることがあるという問題があっ
た。The above-described conventional distortion compensation method for the transmission apparatus uses the level of the intermodulation distortion component of the transmission signal at the output end of the common amplification section as the basic data for distortion compensation, and therefore the actual transmission is performed. In the equipment, it is not possible to compensate the intermodulation distortion that occurs in the bandpass filter and the transmission antenna that are arranged further after the common amplification section, and the intermodulation distortion of the transmission signal is larger than the specified value during system operation. There was a problem that sometimes.
【００１１】[0011]
【課題を解決するための手段】本発明による送信装置の
歪み補償方式は、複数の高周波数信号を共通増幅して送
信信号を生じる共通増幅器と、前記送信信号を帯域制限
する帯域通過ろ波器と、帯域制限された前記送信信号を
送信電波として放射する送信アンテナと、前記送信信号
の含む相互変調歪み成分を低減する歪み補償回路とを備
える送信装置の歪み補償方式において、前記相互変調歪
み成分の周波数を計算する歪み成分周波数計算部と、受
信アンテナに受けた前記送信電波と前記歪み成分周波数
計算部からの前記相互変調歪み成分の周波数情報とに応
答して前記相互変調歪み成分の周波数に対応する相互変
調歪み成分レベルを測定する試験用受信機と、測定され
る前記相互変調歪み成分レベルを予め定めた所定レベル
以下にするように前記歪み補償回路を制御する歪み補償
回路制御部とを備える。DISCLOSURE OF THE INVENTION A distortion compensating method for a transmitter according to the present invention comprises a common amplifier for common amplification of a plurality of high frequency signals to generate a transmission signal, and a band pass filter for band limiting the transmission signal. A distortion compensating method for a transmitter, comprising: a transmission antenna that radiates the band-limited transmission signal as a transmission radio wave; and a distortion compensation circuit that reduces an intermodulation distortion component included in the transmission signal. A frequency component of the intermodulation distortion component in response to the transmission radio wave received by the receiving antenna and the frequency information of the intermodulation distortion component from the distortion component frequency calculation unit. A test receiver for measuring the corresponding intermodulation distortion component level, and so that the measured intermodulation distortion component level is below a predetermined level. And a distortion compensation circuit control unit for controlling the Kiyugami compensation circuit.
【００１２】前記送信装置の歪み補償方式は、前記歪み
補償回路が、前記共通増幅器の前段に接続されるプリデ
ィストーション型の歪み補償回路である構成をとること
ができる。The distortion compensating method of the transmitting apparatus may be configured such that the distortion compensating circuit is a predistortion type distortion compensating circuit connected to a stage preceding the common amplifier.
【００１３】該送信装置の歪み補償方式は、互いに異な
る周波数の前記高周波数信号を生じ得るとともに稼働情
報を送出する複数の送信機をさらに備え、前記歪み成分
周波数計算部が、前記稼働情報に応答して前記送信機の
送出する高周波数信号の周波数を除く前記相互変調歪み
成分の周波数を計算する構成をとることができる。The distortion compensation method of the transmission device further comprises a plurality of transmitters capable of generating the high frequency signals having different frequencies and transmitting operation information, and the distortion component frequency calculation unit responds to the operation information. Then, the frequency of the intermodulation distortion component excluding the frequency of the high frequency signal transmitted by the transmitter can be calculated.
【００１４】[0014]
【実施例】次に、本発明について図面を参照して説明す
る。Next, the present invention will be described with reference to the drawings.
【００１５】図１は本発明の一実施例のブロック図であ
る。FIG. 1 is a block diagram of an embodiment of the present invention.
【００１６】図１および図２を併せ参照すると、この送
信装置は、図３に示したと同様の送信機部１，共通増幅
部２，帯域通過ろ波器３，送信アンテナ４および制御部
５を備えるが、共通増幅部２と帯域通過ろ波器３との間
の方向性結合器７を省き、また歪み検出部８に代えて試
験用受信機６を備えている。ここで、図３の送信装置に
おいても用いられている回路は、本実施例においても同
様の動作を行うので、冗長さを避けるため、同じ動作に
ついては説明を省略する。Referring to FIG. 1 and FIG. 2 together, this transmitter includes a transmitter section 1, a common amplifier section 2, a bandpass filter 3, a transmission antenna 4 and a control section 5 similar to those shown in FIG. However, the directional coupler 7 between the common amplifier 2 and the bandpass filter 3 is omitted, and the test receiver 6 is provided instead of the distortion detector 8. Here, the circuit used in the transmitter of FIG. 3 also performs the same operation in this embodiment, and therefore, to avoid redundancy, the description of the same operation is omitted.
【００１７】この送信装置において、共通増幅部２の後
段に接続される帯域通過ろ波器３および送信アンテナ４
は共通増幅器２４より少ないながらも非直線特性を有す
るため、帯域通過ろ波器３から出力する送信信号１０３
および送信アンテナ４から放射される送信電波１０４
は、共通増幅部２の出力する送信信号１０２が含むより
大きいレベルの相互変調歪み成分を含むことになる。In this transmitting apparatus, the bandpass filter 3 and the transmitting antenna 4 connected to the latter stage of the common amplifying section 2
Has a non-linear characteristic though the number is smaller than that of the common amplifier 24, the transmission signal 103 output from the band pass filter 3 is
And the transmission radio wave 104 radiated from the transmission antenna 4
Will contain a higher level of intermodulation distortion component contained in the transmission signal 102 output from the common amplification section 2.
【００１８】試験用受信機６は、共通増幅部２および送
受信機部１の近傍に移動自在に備えられ、送信アンテナ
４からの送信電波１０４を受信アンテナ６ａに受ける受
信機である。試験用受信機６は、送信電波１０４の含む
相互変調歪み成分レベル，つまり、制御部５から供給さ
れる測定周波数指定信号１０５の指示する周波数の信号
レベルを測定する。ここで、仮に上記歪み補償回路を動
作させない場合には、この受信機６による相互変調歪み
成分の測定レベルは、受信可能な送信電波１０４のレベ
ルを同一とすると、図３の歪み検出部８による測定レベ
ルより大きなものとなる。なお、測定周波数指定信号１
０５の指示する周波数は１つでも複数であってもよい。The test receiver 6 is a receiver that is movably provided in the vicinity of the common amplification section 2 and the transceiver section 1, and receives the transmission radio wave 104 from the transmission antenna 4 at the reception antenna 6a. The test receiver 6 measures the intermodulation distortion component level included in the transmitted radio wave 104, that is, the signal level of the frequency designated by the measurement frequency designation signal 105 supplied from the control unit 5. If the distortion compensating circuit is not operated, the measurement level of the intermodulation distortion component by the receiver 6 is the same as that of the receivable transmission radio wave 104, and the distortion detection unit 8 of FIG. It is larger than the measurement level. In addition, measurement frequency designation signal 1
The frequency indicated by 05 may be one or more.
【００１９】制御部５は、試験用受信機６の測定する相
互変調歪み成分レベルをモニタしながら、歪み補償制御
信号１０６により共通増幅部２の歪み補償回路を制御す
る。即ち、制御部５は、上記相互変調歪み成分の測定レ
ベルが予め定めた所定値以下になるように、補償制御信
号１０６により可変移相器２６および可変減衰器２７を
制御する。The control unit 5 controls the distortion compensation circuit of the common amplification unit 2 by the distortion compensation control signal 106 while monitoring the intermodulation distortion component level measured by the test receiver 6. That is, the control unit 5 controls the variable phase shifter 26 and the variable attenuator 27 by the compensation control signal 106 so that the measurement level of the intermodulation distortion component becomes equal to or lower than a predetermined value.
【００２０】上述のとおりに上記歪み補償回路を制御す
ることにより、本実施例の送信装置は、共通増幅部２，
帯域通過ろ波器３および送信アンテナ４の３個所で発生
する相互変調歪みを補償することができる。By controlling the distortion compensating circuit as described above, the transmitting apparatus according to the present embodiment has the common amplifying section 2,
It is possible to compensate the intermodulation distortion generated at the three places of the band pass filter 3 and the transmission antenna 4.
【００２１】[0021]
【発明の効果】以上説明したように本発明は、送信信号
の相互変調歪み成分の周波数を計算する歪み成分周波数
計算部と、受信アンテナに受けた前記送信電波と前記歪
み成分周波数計算部からの前記相互変調歪み成分の周波
数情報とに応答して前記相互変調歪み成分の周波数に対
応する相互変調歪み成分レベルを測定する試験用受信機
と、測定される前記相互変調歪み成分レベルを予め定め
た所定レベル以下にするように歪み補償回路を制御する
歪み補償回路制御部とを備えるので、共通増幅器で発生
する相互変調歪みのみならず、前記共通増幅器の後段に
接続した帯域通過ろ波器および送信アンテナから発生す
る相互変調歪みも補償することができ、システム運用に
おいて前記相互変調歪みによる前記送信電波の品質劣化
を低減できるという効果がある。As described above, according to the present invention, the distortion component frequency calculating section for calculating the frequency of the intermodulation distortion component of the transmission signal, the transmission radio wave received by the receiving antenna, and the distortion component frequency calculating section are provided. A test receiver for measuring the intermodulation distortion component level corresponding to the frequency of the intermodulation distortion component in response to the frequency information of the intermodulation distortion component, and the intermodulation distortion component level to be measured are predetermined. Since the distortion compensating circuit control unit that controls the distortion compensating circuit so as to keep the level below a predetermined level is provided, not only the intermodulation distortion that occurs in the common amplifier but also the bandpass filter and the transmission connected to the subsequent stage of the common amplifier are provided. It can be said that the intermodulation distortion generated from the antenna can be compensated, and the deterioration of the quality of the transmitted radio wave due to the intermodulation distortion can be reduced in system operation. There is an effect.
【図１】本発明の一実施例のブロック図である。FIG. 1 is a block diagram of one embodiment of the present invention.
【図２】本発明に関わる共通増幅部２のブロック図であ
る。FIG. 2 is a block diagram of a common amplification section 2 according to the present invention.
【図３】従来の送信装置のブロック図である。FIG. 3 is a block diagram of a conventional transmitter.
【符号の説明】 １ 送信機部 １−１〜１−ｎ 送信機（ＴＸ） ２ 共通増幅部 ３ 帯域通過ろ波器 ４ 送信アンテナ ５ 制御部 ６ 試験用受信機 ６ａ 受信アンテナ ７ 方向性結合器 ８ 歪み検出部 ２１ 電力合成器 ２２ 遅延線 ２３ 電力合成器 ２４ 共通増幅器 ２５ 歪発生器 ２６ 可変移相器 ２７ 可変減衰器[Explanation of Codes] 1 transmitter section 1-1 to 1-n transmitter (TX) 2 common amplification section 3 band pass filter 4 transmission antenna 5 control section 6 test receiver 6a reception antenna 7 directional coupler 8 distortion detector 21 power combiner 22 delay line 23 power combiner 24 common amplifier 25 distortion generator 26 variable phase shifter 27 variable attenuator
Claims (3)
信号を生じる共通増幅器と、前記送信信号を帯域制限す
る帯域通過ろ波器と、帯域制限された前記送信信号を送
信電波として放射する送信アンテナと、前記送信信号の
含む相互変調歪み成分を低減する歪み補償回路とを備え
る送信装置の歪み補償方式において、 前記相互変調歪み成分の周波数を計算する歪み成分周波
数計算部と、受信アンテナに受けた前記送信電波と前記
歪み成分周波数計算部からの前記相互変調歪み成分の周
波数情報とに応答して前記相互変調歪み成分の周波数に
対応する相互変調歪み成分レベルを測定する試験用受信
機と、測定される前記相互変調歪み成分レベルを予め定
めた所定レベル以下にするように前記歪み補償回路を制
御する歪み補償回路制御部とを備えることを特徴とする
送信装置の歪み補償方式。1. A common amplifier for commonly amplifying a plurality of high frequency signals to generate a transmission signal, a band pass filter for band limiting the transmission signal, and radiating the band limited transmission signal as a transmission radio wave. A distortion compensating method for a transmitting device, comprising: a transmitting antenna; and a distortion compensating circuit for reducing an intermodulation distortion component included in the transmission signal, wherein a distortion component frequency calculating section for calculating a frequency of the intermodulation distortion component, and a receiving antenna A test receiver for measuring an intermodulation distortion component level corresponding to the frequency of the intermodulation distortion component in response to the received transmission radio wave and the frequency information of the intermodulation distortion component from the distortion component frequency calculation unit; And a distortion compensation circuit control unit that controls the distortion compensation circuit so that the measured intermodulation distortion component level is equal to or lower than a predetermined level. Distortion compensation method of the transmission apparatus characterized by.
前段に接続されるプリディストーション型の歪み補償回
路であることを特徴とする請求項１記載の送信装置の歪
み補償方式。2. The distortion compensation system for a transmitter according to claim 1, wherein the distortion compensation circuit is a pre-distortion type distortion compensation circuit connected to a stage preceding the common amplifier.
を生じ得るとともに稼働情報を送出する複数の送信機を
さらに備え、 前記歪み成分周波数計算部が、前記稼働情報に応答して
前記送信機の送出する高周波数信号の周波数を除く前記
相互変調歪み成分の周波数を計算することを特徴とする
請求項２記載の送信装置の歪み補償方式。3. The apparatus further comprises a plurality of transmitters capable of generating the high-frequency signals having mutually different frequencies and transmitting operation information, wherein the distortion component frequency calculation unit transmits the operation information in response to the operation information. The distortion compensating method of the transmitting apparatus according to claim 2, wherein frequencies of the intermodulation distortion components other than frequencies of high frequency signals to be calculated are calculated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19024094A JPH0856184A (en) | 1994-08-12 | 1994-08-12 | Distortion compensation system for transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19024094A JPH0856184A (en) | 1994-08-12 | 1994-08-12 | Distortion compensation system for transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0856184A true JPH0856184A (en) | 1996-02-27 |
Family
ID=16254841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19024094A Pending JPH0856184A (en) | 1994-08-12 | 1994-08-12 | Distortion compensation system for transmitter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0856184A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6418302B1 (en) | 1999-03-17 | 2002-07-09 | Fujitsu Limited | Wireless device |
| US7127211B2 (en) * | 2002-02-21 | 2006-10-24 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for reduced intermodulation distortion in a radio transceiver |
| US7831369B2 (en) * | 2005-11-16 | 2010-11-09 | Gm Global Technology Operations, Inc. | Method and apparatus for vehicle and engine operation |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5915338A (en) * | 1982-07-16 | 1984-01-26 | Nippon Telegr & Teleph Corp <Ntt> | Radio communication device |
-
1994
- 1994-08-12 JP JP19024094A patent/JPH0856184A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5915338A (en) * | 1982-07-16 | 1984-01-26 | Nippon Telegr & Teleph Corp <Ntt> | Radio communication device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6418302B1 (en) | 1999-03-17 | 2002-07-09 | Fujitsu Limited | Wireless device |
| US7127211B2 (en) * | 2002-02-21 | 2006-10-24 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for reduced intermodulation distortion in a radio transceiver |
| US7831369B2 (en) * | 2005-11-16 | 2010-11-09 | Gm Global Technology Operations, Inc. | Method and apparatus for vehicle and engine operation |
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