WO2003103185A1 - Procede de reception fonde sur les techniques mimo et amrc - Google Patents

Procede de reception fonde sur les techniques mimo et amrc Download PDF

Info

Publication number
WO2003103185A1
WO2003103185A1 PCT/CN2002/000368 CN0200368W WO03103185A1 WO 2003103185 A1 WO2003103185 A1 WO 2003103185A1 CN 0200368 W CN0200368 W CN 0200368W WO 03103185 A1 WO03103185 A1 WO 03103185A1
Authority
WO
WIPO (PCT)
Prior art keywords
receiving
transmitting
antennas
antenna
signals
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.)
Ceased
Application number
PCT/CN2002/000368
Other languages
English (en)
Chinese (zh)
Inventor
Dandan Wang
Gang Wang
Yonghui Li
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Linkair Communications Inc
Original Assignee
Linkair Communications Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Linkair Communications Inc filed Critical Linkair Communications Inc
Priority to PCT/CN2002/000368 priority Critical patent/WO2003103185A1/fr
Priority to AU2002313159A priority patent/AU2002313159A1/en
Priority to CNA028181239A priority patent/CN1555613A/zh
Publication of WO2003103185A1 publication Critical patent/WO2003103185A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • 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
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/7103—Interference-related aspects the interference being multiple access interference
    • H04B1/7105—Joint detection techniques, e.g. linear detectors
    • H04B1/71057—Joint detection techniques, e.g. linear detectors using maximum-likelihood sequence estimation [MLSE]
    • 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
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03178—Arrangements involving sequence estimation techniques
    • H04L25/03331—Arrangements for the joint estimation of multiple sequences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/023—Multiplexing of multicarrier modulation signals, e.g. multi-user orthogonal frequency division multiple access [OFDMA]
    • H04L5/026—Multiplexing of multicarrier modulation signals, e.g. multi-user orthogonal frequency division multiple access [OFDMA] using code division

Definitions

  • the present invention belongs to the field of communication technology, and specifically, it is a receiving method based on MIMO CDMA.
  • BACKGROUND With the development of wireless communications, the status of data transmission has become increasingly prominent. In particular, 3G standards have paid special attention to data transmission.
  • the service capabilities of the third generation of mobile communications will be significantly improved over the second generation. It should be able to support voice packet data to multimedia services; it should be able to provide bandwidth as needed.
  • ITU International Telecommunication Union
  • the highest rate is 144kbi t / s; indoor environment, the highest rate is 2Mbi t / s; outdoor to indoor or pedestrian environment, the highest rate is 384kbi t / s. It is predicted that the speed of the fourth generation mobile communication can reach more than 10 Mbps, and may even reach 30 Mbps to 100 Mbps.
  • the frequency band of the first generation of analog mobile communications is several hundred megahertz
  • the frequency band of the second generation of digital mobile phone systems is several hundred megahertz to gigahertz
  • the frequency band of the third generation of mobile communications in the future will be 2 gigahertz (2GHz )about.
  • MIMO Multiple-input multiple-output system
  • N multiple antennas
  • the peak capacity can be increased by N times, and the code reuse and small modulation constellation can be combined to obtain other intermediate rates.
  • MIM0 and CDMA Code Division Multiple Access
  • Code division multiple access includes two basic technologies, one is code division technology, which is spread spectrum technology; the other is multiple access technology. Combining these two basic technologies and absorbing other key technologies has formed the technical support of today's CDMA mobile communication systems.
  • the resources that a cellular system provides to users include time, frequency, and coding methods. Generally speaking, different systems can use different communication resources to distinguish communication objects. One such channel can only accommodate one user for communication, and many users who communicate at the same time are distinguished from each other in the form of different abstract channels. Site concept.
  • the cellular mobile communication system is a system with multiple abstract channels working simultaneously, and has the characteristics of broadcasting and large-area coverage in the downlink direction.
  • Code division multiple access uses a set of orthogonal (or quasi-orthogonal) pseudo-random noise (PN) sequences (referred to as pseudo-random codes) through correlation processing to achieve the function of sharing frequency resources and simultaneous access to the network by multiple users.
  • PN pseudo-random noise
  • CDMA uses spread spectrum technology. The concept of spread spectrum technology is to transform the bandwidth of the original information into a much wider noise-like signal.
  • the spectrum of the useful signal is broadened after being spread-spectrum processed; at the receiving end, the spectrum of the useful signal is restored to a narrow-band spectrum after being subjected to despreading processing using the correlation of the pseudo code.
  • the wideband unwanted signal is not related to the local pseudocode, so it cannot be despread, and it is still a wideband spectrum; the narrowband unwanted signal is expanded by the local pseudocode into a wideband error. Since the unwanted interference signal is a wideband spectrum and the useful signal is a narrowband spectrum, we can use a narrowband filter to eliminate out-of-band interference levels, so the signal-to-noise ratio in the narrowband is greatly improved.
  • MIMO CDMA systems increase system capacity by sending independent spread-spectrum signals on different antennas. Signals on the same antenna are distinguished by orthogonal (or quasi-orthogonal) pseudo-random codes.
  • orthogonal (or quasi-orthogonal) pseudo-random codes due to the introduction of multiple antennas, under the Rayleigh fading channel model, the traditional RAKE reception scheme in CDMA technology is no longer applicable.
  • a new scheme on how to use the characteristics of CDMA signals for reception under multipath channel conditions is not. None appeared. Summary of the Invention
  • An object of the present invention is to provide a receiving method based on MIMO CDMA, which utilizes the characteristics of a MIM0 CDMA system under a Rayleigh fading channel, and proposes a MIMO CDMA system that is not only suitable for single carriers, but also according to the principle of maximum likelihood.
  • the receiving scheme applicable to overlapping or non-overlapping multi-carrier receiving systems enables the transmission signals on different carriers of different antennas in a MIMO CDMA system to be recovered.
  • the present invention provides an algorithm whose complexity is not high for the combination of two technologies, MIM0 and CDMA, and provides conditions for the application of these two technologies.
  • the technical solution of the present invention is: a receiving method based on MIMO CDMA, characterized in that the transmitting end uses at least two transmitting antennas to send signals independent of each other;
  • the receiving end uses at least two receiving antennas to receive the signal sent by the transmitting antenna, and according to the characteristics of MIMO CDMA under the Rayleigh fading channel, the signal sent by the transmitting antenna is recovered at the receiving end according to the maximum likelihood criterion.
  • the transmitting end uses at least two transmitting antennas to send signals independent of each other means that: the transmitting end may use more than two transmitting antennas to send signals; the receiving end uses at least two receiving antennas to send signals to the transmitting antennas Receiving means: The receiving end can use more than two receiving antennas to receive the signals sent by the transmitting antennas.
  • the transmitting terminal uses at least two transmitting antennas to send signals independent of each other means that: the transmitting terminal can use two transmitting antennas to send signals; the receiving terminal uses at least two receiving antennas to receive signals sent by the transmitting antennas It means: The receiving end can use two receiving antennas to receive the signal sent by the transmitting antenna.
  • the receiving step of the receiving end includes:
  • the receiving end uses at least two receiving antennas to receive the signals sent by the transmitting antennas; the receiving end obtains the differences received on different receiving antennas according to the characteristics of MIMO CDMA under the Rayleigh fading channel and the ideal autocorrelation and cross-correlation characteristics of the codeword Separation signal
  • the signal sent by the transmitting antenna is recovered at the receiving end according to the maximum likelihood criterion.
  • the receiving step of the receiving end further includes:
  • the receiving end uses the receiving antenna 1 and the receiving antenna 2 to receive signals transmitted by the transmitting antenna 1 and the transmitting antenna 2;
  • H1, H2, H3, and H4 are transmitting antenna 1 and receiving antenna 1, transmitting antenna 2 and receiving antenna 1, transmitting antenna 1 and receiving antenna 2 respectively.
  • rl and ⁇ 2 be the signals received on receiving antenna 1 and receiving antenna 2, respectively; Take the 2-path Rayleigh fading channel as an example,
  • c i is a spread-spectrum pseudo-random code of the i-th user. It has ideal auto-correlation and cross-correlation characteristics within the scope of investigation, and can be obtained:
  • G1 and G2 be the merging coefficients of ⁇ and ⁇ , respectively, and then obtain according to the maximum likelihood criterion: and according to the maximum likelihood criterion, obtain:
  • the signals bl and b2 sent by the transmitting antenna are recovered at the receiving end.
  • the above steps can be analogized to MIMO CDMA that uses more than two transmitting antennas to send signals and uses more than two receiving antennas to receive signals sent by transmitting antennas.
  • ⁇ ⁇ 12 ⁇ 2I 2 2 is not limited to the inversion matrix in this example, as long as the separated multipath signals are obtained, they can be combined according to this method.
  • the beneficial effects of the present invention are as follows:
  • the present invention is a receiving method designed according to the maximum likelihood maximum likelihood criterion using the characteristics of a MIMO CDMA system under a Rayleigh fading channel.
  • the invention is used in a MIMO CDMA system, and uses the characteristics of spread-spectrum signals in a multipath channel to separate receive and then combine, which is a method with little computational complexity and is applicable to both MIMO CDMA single-carrier and multi-carrier systems.
  • the invention provides a method with low computational complexity for the combination of the two technologies of MIMO and CDMA, and provides conditions for the application of these two technologies.
  • Figure 1 is a block diagram of a MIMO CDMA system
  • Figure 2 shows the simulation curves of MIM0, multipath, and bit error rate, where ML is: Maximum Likelihood Criterion and EGC is: Proportional Gain Merging.
  • Figure 1 is a block diagram of a MIMO CDMA system, where the transmitting end uses at least two transmitting antennas to send signals independent of each other; the receiving end uses at least two receiving antennas to receive signals sent by the transmitting antennas, and according to MIMO CDMA, the Rayleigh fading channel The characteristics, maximum likelihood criterion make the signal sent by the transmitting antenna recovered at the receiving end.
  • the calculation method of the present invention is described below by taking two transmitting antennas and two receiving antennas as examples. In other cases, the calculation method can be deduced by analogy.
  • Let bl and b2 be independent symbol information transmitted on the two antennas.
  • H1, H2, H3, and H4 are the transmitting antenna 1 and the receiving antenna 1, the transmitting antenna and the receiving antenna 1, the transmitting antenna 1 and the receiving antenna 2, respectively.
  • Let rl and r2 be the signals received on receiving antenna 1 and receiving antenna 2, respectively. Take 2 trails Rayleigh An example of a fading channel:
  • C is a spread-spectrum pseudo-random code of the i-th user, which has ideal auto-correlation and cross-correlation characteristics in the scope of investigation, that is:
  • Figure 2 shows some simulation characteristics. The figure also shows the curve of proportional gain combining (EGC).
  • ECG proportional gain combining
  • the invention is used in a MIMO CDMA system and uses the characteristics of a spread spectrum signal to receive separately in a multipath channel. It is an algorithm with little computational complexity and is applicable to both MIMO CDMA single-carrier and multi-carrier systems.
  • the invention provides a low complexity algorithm for the combination of the two technologies of MIM0 and CDMA, and provides conditions for the application of these two technologies.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de réception fondé sur les techniques MIMO et AMRC. Ce procédé se caractérise en ce que: le terminal émetteur envoie des signaux séparés à l'aide d'au moins deux antennes émettrices, le terminal récepteur reçoit les signaux émise par le terminal émetteur à l'aide d'au moins deux antennes de réception, puis il fait la synthèse des signaux émis par le terminal émetteur en fonction du critère de probabilité maximale et de la caractéristique selon MIMO et AMRC, dans le canal à évanouissement de Rayleigh. Selon la présente invention, on utilise un algorithme moins complexe pour la réception séparée selon la caractéristique des signaux étalés dans le canal multivoie, cela pour les techniques MIMO et AMRC, cet algorithme étant adapté à la fois au système à une seule onde porteuse et au système à plusieurs ondes porteuses selon les techniques MIMO et AMRC. L'algorithme selon l'invention est d'une moindre complexité fonctionnelle pour la combinaison de la technique MIMO et de la technique AMRC, et elle permet l'utilisation de ces deux techniques.
PCT/CN2002/000368 2002-05-30 2002-05-30 Procede de reception fonde sur les techniques mimo et amrc Ceased WO2003103185A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/CN2002/000368 WO2003103185A1 (fr) 2002-05-30 2002-05-30 Procede de reception fonde sur les techniques mimo et amrc
AU2002313159A AU2002313159A1 (en) 2002-05-30 2002-05-30 A receiving method based on mimo cdma
CNA028181239A CN1555613A (zh) 2002-05-30 2002-05-30 一种基于mimo cdma的接收方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2002/000368 WO2003103185A1 (fr) 2002-05-30 2002-05-30 Procede de reception fonde sur les techniques mimo et amrc

Publications (1)

Publication Number Publication Date
WO2003103185A1 true WO2003103185A1 (fr) 2003-12-11

Family

ID=29589402

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2002/000368 Ceased WO2003103185A1 (fr) 2002-05-30 2002-05-30 Procede de reception fonde sur les techniques mimo et amrc

Country Status (3)

Country Link
CN (1) CN1555613A (fr)
AU (1) AU2002313159A1 (fr)
WO (1) WO2003103185A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101938338A (zh) * 2010-09-30 2011-01-05 哈尔滨工业大学 基于二维块扩频系统的多用户mimo空间复用系统
CN101944933A (zh) * 2010-09-30 2011-01-12 哈尔滨工业大学 基于二维最小均方误差检测算法的二维块扩频系统中的残留多用户干扰抑制方法
CN101951309A (zh) * 2010-10-18 2011-01-19 哈尔滨工业大学 基于二维块扩频技术的多用户协作虚拟4天线空时循环延迟传输分集系统
CN101951277A (zh) * 2010-09-30 2011-01-19 哈尔滨工业大学 基于最大似然检测的二维块扩频系统中的残留多用户干扰抑制方法
CN101951278A (zh) * 2010-09-30 2011-01-19 哈尔滨工业大学 基于并行干扰取消及迭代检测的二维块扩频系统中的残留多用户干扰抑制方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7525988B2 (en) * 2005-01-17 2009-04-28 Broadcom Corporation Method and system for rate selection algorithm to maximize throughput in closed loop multiple input multiple output (MIMO) wireless local area network (WLAN) system
CN101056152B (zh) * 2006-04-30 2010-08-04 华为技术有限公司 通用移动通信系统中的传输方法及其系统
US7634235B2 (en) * 2006-05-30 2009-12-15 Broadcom Corporation Method and apparatus to improve closed loop transmit diversity modes performance via interference suppression in a WCDMA network equipped with a rake receiver
CN101272226B (zh) * 2007-03-23 2011-08-10 中兴通讯股份有限公司 时分同步码分多址系统室内覆盖的多输入多输出系统和方法
CN101272167B (zh) * 2007-03-23 2013-01-23 中兴通讯股份有限公司 时分同步码分多址系统室外宏蜂窝的多输入多输出系统和方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5546429A (en) * 1992-11-09 1996-08-13 Motorola, Inc. Frequency hopping code division multiple access radio communication unit
DE19953879A1 (de) * 1999-11-09 2001-06-13 Siemens Ag Verfahren zur Signalübertragung in einem Funk-Kommunikationssystem
EP1128575A1 (fr) * 2000-02-22 2001-08-29 TELEFONAKTIEBOLAGET L M ERICSSON (publ) Evaluation de canal dans un récepteur en diversité utilisant des séquences d'apprentisssage simultanément transmises
JP2001267986A (ja) * 2000-03-23 2001-09-28 Toshiba Corp ディジタル無線受信機

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5546429A (en) * 1992-11-09 1996-08-13 Motorola, Inc. Frequency hopping code division multiple access radio communication unit
DE19953879A1 (de) * 1999-11-09 2001-06-13 Siemens Ag Verfahren zur Signalübertragung in einem Funk-Kommunikationssystem
EP1128575A1 (fr) * 2000-02-22 2001-08-29 TELEFONAKTIEBOLAGET L M ERICSSON (publ) Evaluation de canal dans un récepteur en diversité utilisant des séquences d'apprentisssage simultanément transmises
JP2001267986A (ja) * 2000-03-23 2001-09-28 Toshiba Corp ディジタル無線受信機

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101938338A (zh) * 2010-09-30 2011-01-05 哈尔滨工业大学 基于二维块扩频系统的多用户mimo空间复用系统
CN101944933A (zh) * 2010-09-30 2011-01-12 哈尔滨工业大学 基于二维最小均方误差检测算法的二维块扩频系统中的残留多用户干扰抑制方法
CN101951277A (zh) * 2010-09-30 2011-01-19 哈尔滨工业大学 基于最大似然检测的二维块扩频系统中的残留多用户干扰抑制方法
CN101951278A (zh) * 2010-09-30 2011-01-19 哈尔滨工业大学 基于并行干扰取消及迭代检测的二维块扩频系统中的残留多用户干扰抑制方法
CN101938338B (zh) * 2010-09-30 2012-12-05 哈尔滨工业大学 基于二维块扩频系统的多用户mimo空间复用系统
CN101951278B (zh) * 2010-09-30 2013-03-27 哈尔滨工业大学 基于并行干扰取消及迭代检测的二维块扩频系统中的残留多用户干扰抑制方法
CN101944933B (zh) * 2010-09-30 2013-04-24 哈尔滨工业大学 基于二维最小均方误差检测算法的二维块扩频系统中的残留多用户干扰抑制方法
CN101951277B (zh) * 2010-09-30 2013-06-05 哈尔滨工业大学 基于最大似然检测的二维块扩频系统中的残留多用户干扰抑制方法
CN101951309A (zh) * 2010-10-18 2011-01-19 哈尔滨工业大学 基于二维块扩频技术的多用户协作虚拟4天线空时循环延迟传输分集系统

Also Published As

Publication number Publication date
AU2002313159A1 (en) 2003-12-19
CN1555613A (zh) 2004-12-15

Similar Documents

Publication Publication Date Title
TW589818B (en) Method of transmit diversity using TDD wideband multi-carrier DS-CDMA system
CN1124544A (zh) 用于解调下行链路码分多址信号的方法和系统
US20100172397A1 (en) Method and system for diversity processing
EP1338101A1 (fr) Architecture de recepteur pour une diversite d'emission dans un systeme amrc
WO2003103185A1 (fr) Procede de reception fonde sur les techniques mimo et amrc
Dekorsy et al. M-ary orthogonal modulation for MC-CDMA systems in indoor wireless radio networks
WO2003103249A1 (fr) Procede et systeme de transmission rapide de donnees selon la technique amrc
Lee et al. A solution to improvement of DS-UWB system in the wireless home entertainment network
JP5512627B2 (ja) マルチコードｃｄｍａシステムのｍｍｓｅスペースタイムイコライザーのための最適重み
Zhang et al. Research on beyond 3G mobile communications
Umehira et al. OFDM/CDMA technologies for future broadband mobile communication systems
Takeda et al. Performance evaluation of multi-rate DS-CDMA using frequency-domain equalization in a frequency-selective fading channel
Tao et al. Performance of space-time coded MC-CDMA over time and frequency selective fading channel
Sigdel et al. Performance evaluation of MC-CDMA uplink system with diversity reception and multiuser detection
Gohar et al. VBLAST: a space-division multiplexing technique is providing a spectral efficiency necessary for high data rate wireless networks
CN101160747B (zh) 发送系统和发送方法及接收系统和接收方法
Yaremko Efficiency increase of information services in3G and 4G networks, using MIMO-systems
Sundararajan et al. Performance Analysis of Uplink Cognitive Radio Transmission based on Overloaded MC-DS-CDMA
CN101047418A (zh) 空码发射分集信道接收解调方法
Nagaradjane et al. A robust space time co-channel interference mitigation and detection technique for Multiuser MIMO Multicarrier DS/CDMA systems
Zhang et al. Downlink CDMA systems with space-time codes and interference cancellation
Liu et al. Performance of the uplink multicarrier CDMA systems for WPAN indoor applications on MMW band
Ruihua et al. Multi Antenna Precoding Algorithm Based on M Spread Spectrum
CN101447819A (zh) Mimo-cdma基站空间复用接收机系统
Sinha et al. Experimental studies and simulations based prediction of a better MIMO-OFDM combined system for broadband wireless mobile communication

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ OM PH PL PT RO RU SD SE SG SI SK SL TJ TM TN TR TT TZ UA UG US UZ VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 20028181239

Country of ref document: CN

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP