WO2011020243A1 - Procédé et équipement de relais coopératif dans un système de communication sans fil - Google Patents

Procédé et équipement de relais coopératif dans un système de communication sans fil Download PDF

Info

Publication number
WO2011020243A1
WO2011020243A1 PCT/CN2009/073358 CN2009073358W WO2011020243A1 WO 2011020243 A1 WO2011020243 A1 WO 2011020243A1 CN 2009073358 W CN2009073358 W CN 2009073358W WO 2011020243 A1 WO2011020243 A1 WO 2011020243A1
Authority
WO
WIPO (PCT)
Prior art keywords
data packet
access link
relay station
receiving device
link
Prior art date
Application number
PCT/CN2009/073358
Other languages
English (en)
Chinese (zh)
Inventor
陈继明
冷晓冰
刘继民
张凯宾
金珊
Original Assignee
上海贝尔股份有限公司
阿尔卡特朗讯
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 上海贝尔股份有限公司, 阿尔卡特朗讯 filed Critical 上海贝尔股份有限公司
Priority to PCT/CN2009/073358 priority Critical patent/WO2011020243A1/fr
Priority to CN200980159868.3A priority patent/CN102474388B/zh
Publication of WO2011020243A1 publication Critical patent/WO2011020243A1/fr

Links

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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0076—Distributed coding, e.g. network coding, involving channel coding
    • H04L1/0077—Cooperative coding
    • 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
    • H04L1/0618—Space-time coding
    • H04L1/0637—Properties of the code
    • H04L1/0668—Orthogonal systems, e.g. using Alamouti codes
    • 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
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0097—Relays

Definitions

  • the present invention generally relates to wireless communication systems and, more particularly, to a method and apparatus for cooperative relaying in a wireless communication system. Background technique
  • cooperative relaying is an efficient physical layer technology that achieves diversity gain in a distributed manner.
  • the primary idea of cooperative relay is to treat the relay node as a virtual antenna, thereby helping to facilitate wireless communication of a single source-destination pair by implementing two important features of the wireless medium.
  • Two important features of the wireless medium are its broadcast properties and the ability to obtain spatial diversity or spatial multiplexing.
  • the performance of the wireless communication system can be further improved by introducing cooperative relay technology between the base station (BS) and/or the relay station (RS).
  • a cooperative relaying solution commonly found in multi-hop wireless communication systems employs distributed space time block coding (STBC) and distributed spatial multiplexing (SM) in cooperative relaying. Since the distributed STBC and SM transmit data in a fixed format, the receiving end only needs to use channel information (which is obtained by transmitting a known reference signal through the transmitting end) for demodulation, and the transmitting end does not need channel information. Therefore, they do not require feedback channel state information (CSI), which can effectively improve system performance without requiring additional signaling overhead.
  • STBC space time block coding
  • SM distributed spatial multiplexing
  • FIG. 1 depicts an illustrative example of downlink spatial diversity of the cooperative relay described above, wherein the relay stations RS1 and RS2 receive data packets by a relay link via the transmitting device BS to RS1 and RS2 (S 2 , Si), and the receiving device mobile station (MS) receives the data packet respectively via the access link from RS1 and RS2 to the MS
  • the relay stations RS1 and RS2 receive data packets by a relay link via the transmitting device BS to RS1 and RS2 (S 2 , Si)
  • MS receiving device mobile station
  • the path loss exponent is 4
  • the difference between the access link power path loss will be 12 dB between the MS and BS separated by two kilometers and the MS and RS separated by one kilometer.
  • the spatial diversity gain will be almost completely lost, and even performance may be further deteriorated.
  • Figure 2 is a graph showing the effect of power imbalance on throughput performance when the signal-to-noise ratio SN is 4 dB, where throughput is the data rate transmitted at a unit frequency.
  • the present invention provides a new solution, which is specifically as follows:
  • a method for cooperative relaying in a wireless communication system comprising: receiving a data packet transmitted from a transmitting device via a relay link; Poor power, adaptively adjusted via the access chain a data packet format transmitted to the receiving device to combine data packets received via the direct path power relay station at the receiving device and to achieve spatial diversity between the coordinated relay stations; and to transmit data via the access link
  • the packet is sent to the receiving device.
  • a relay station for cooperative relay in a wireless communication system
  • the relay station comprising: receiving means for receiving a data packet transmitted from a transmitting device via a relay link And an adjusting device, configured to adaptively adjust a data packet group to be transmitted to the receiving device via the access link and a low access link power to cooperate from the access link according to the power difference between the coordinated relay stations
  • the data packets received by the relay station are combined, and spatial diversity between the coordinated relay stations is implemented.
  • the transmitting device is configured to send the data packet to the receiving device via the access link.
  • a method for cooperative relay in a wireless communication system comprising: receiving a data packet transmitted from a transmitting device via a direct link and receiving a coordinated from an access link a data packet transmitted by the relay station; combining the data packet received via the direct link with a data packet received from the coordinated low access link power relay station via the access link, wherein the coordinated relay station Adaptively adjusting data to be transmitted to a receiving device via an access link according to a power difference between each other.
  • a receiving device for cooperative relaying in a wireless communication system comprises: receiving means for receiving a data packet transmitted from the transmitting device via the direct link and receiving a data packet transmitted from the coordinated relay station via the access link; combining means for receiving via the direct link The data packet is merged with data packets received from the cooperating low access link power relay station via the access link, where The relay station adaptively adjusts the data packet format to be transmitted to the receiving device via the access link in accordance with the power difference between the two to achieve spatial diversity between the combined and coordinated relay stations.
  • a wireless communication system using cooperative relay comprising: a transmitting device, configured to send a data packet to a receiving device via a direct link And transmitting a data packet to the relay station via the relay link; a cooperative relay station for receiving data packets from the transmitting device via the relay link and adaptively adjusting according to a power difference between the coordinated relay stations a data packet format to be transmitted to the receiving device via the access link to enable data packet combining at the receiving device and spatial diversity of the coordinated relay station; a receiving device for receiving the data via the direct link The packets are combined with the digital packets received from the cooperating low access link power relay stations to obtain the same access link power between the access links.
  • relay station By implementing the method, relay station, receiving device and wireless communication system provided by the present invention, it is possible to reduce or eliminate power imbalance on an access link existing in cooperative relay, and to maximize diversity gain, Thereby improving the performance of the wireless communication system.
  • FIG. 1 is a diagram schematically showing an example of downlink spatial diversity of cooperative relay
  • FIG. 2 is a diagram schematically showing an effect of power imbalance of an access link in cooperative relay on throughput performance ;
  • FIG. 3 is a flow chart showing a method for cooperative relaying in a wireless communication system in accordance with one embodiment of the present invention
  • FIG. 4 is a block diagram showing a relay station for cooperative relay in a wireless communication system according to an embodiment of the present invention
  • FIG. 5 is a flow chart showing a method for cooperative relaying in a wireless communication system according to an embodiment of the present invention
  • FIG. 6 is a block diagram showing a receiving device for cooperative relay in a wireless communication system according to an embodiment of the present invention
  • FIG. 7 is a detailed flow chart schematically showing adaptive cooperative relay transmission in a downlink according to an embodiment of the present invention.
  • FIG. 8 is a diagram showing an adaptive STBC collaboration method and no cooperation according to the present invention.
  • FIG. 9 is a diagram showing BLER performance of adaptive spatial frequency block coding (SFBC) and distributed SFBC according to another embodiment of the present invention. Comparative diagram;
  • FIG. 10 is a diagram showing a simulation deployment of adaptive spatial frequency block coding according to another embodiment of the present invention.
  • Figure 11 is a system performance comparison diagram showing an adaptive cooperative relay method based on the distributed SFBC method and the present invention. detailed description
  • step 301 a data packet transmitted from the transmitting device is received via the relay link.
  • step 302 the data packet format to be transmitted to the receiving device via the access link is adaptively adjusted according to the power difference between the coordinated relay stations, so as to be received from the transmitting device via the direct link at the receiving device.
  • the data packets are combined with data packets received from the cooperating low access link power relay stations via the access link, and spatial multiplexing between the coordinated relay stations is achieved.
  • step 303 the data packet is sent to the receiving device via the access link.
  • the relay station includes a receiving device 401, an adjusting device 402, and a transmitting device 403.
  • the receiving device 401 is configured to receive a data packet sent from the transmitting device via the relay link.
  • the adjusting means 402 is configured to adaptively adjust a data packet format to be transmitted to the receiving device via the access link according to the power difference between the coordinated relay stations, so as to be received from the transmitting device via the direct link at the receiving device.
  • the data packet rows are merged and spatial diversity between the cooperative repeaters is achieved.
  • Transmitting device 403 is configured to transmit data packets to the receiving device via the access link.
  • FIG. 5 is a flow chart showing a method for cooperative relay in a wireless communication system according to an embodiment of the present invention.
  • step 501 via direct chain
  • the road receives the data packet transmitted from the transmitting device and receives the data packet transmitted from the coordinated relay station via the access link.
  • step 502 the received data received via the direct link is grouped into a merge.
  • the cooperating relay stations adaptively adjust the spatial packet diversity between the relay stations that will transmit the data packet format to be transmitted via the access link to the receiving device in accordance with the mutual power difference.
  • the receiving setting includes a receiving device 601 and a merging device 602.
  • the receiving device 601 is configured to receive a data packet transmitted from the transmitting device via the direct link and receive the data packet transmitted from the coordinated relay station via the access link.
  • the merging device 602 is configured to merge the data received via the direct link.
  • the coordinated relay station adaptively adjusts the data packet format to be transmitted to the receiving device via the access link according to the power difference between the two to achieve spatial diversity between the merged and coordinated relay stations.
  • the wireless communication system includes: And for transmitting a data packet to the receiving device via the direct link and transmitting the data packet to the relay station via the relay link.
  • a cooperative relay station for receiving data packets from the transmitting device via the relay link and adaptively adjusting a data packet format to be transmitted to the receiving device via the access link according to the power difference between the coordinated relay stations , in order to achieve data packet merging at the receiving device and spatial diversity of the coordinated relay station; and receiving means for relaying the data packet received via the direct link with the coordinated low access link power The number of packets received by the station are combined to obtain the same access link power between the access links.
  • FIG. 7 is a detailed flow chart schematically showing adaptive cooperative relay transmission in a downlink according to an embodiment of the present invention.
  • step 70 the transmitting device BS broadcasts a data packet (S 2 , S! ) to the relay stations RS1 and RS2 involved in the cooperative processing through the relay link and the receiving device MS passes the straight The link receives and stores these data packets from the BS without performing equalization and decoding processing on the data packets.
  • the MS respectively transmits channel quality feedback information of the access link between the RS1 and the RS2 to the RS1 and the RS2, and the channel quality feedback information is previously received according to the RS1 and the RS2.
  • the signal is estimated.
  • the previously received signal refers to the reference signal received by the MS in the previous time slot or the previous frame.
  • the channel information estimated by the reference signal can be used as the channel information of the time slot because the communication channel changes slowly. In an environment, adjacent time slots can be considered to be invariant.
  • RS1 and RS2 demodulate and decode the data signal received from the BS.
  • RS1 and RS2 determine respective channel link quality conditions (ie, respective access link power levels) according to the channel quality feedback information mentioned above, respectively, and adaptively determine that they will The data packet format transmitted to the MS. That is, when there is a power difference between the access links of R_S1 and RS2, the RS of the low access link power transmits to the MS in step 75 or 77 that it has the same data packet as the BS transmits to the MS on the direct link.
  • Formatted data packets ie, data packets (S ⁇ S ⁇ o and another RS with high access link power, transmit the same data content to the MS in step 76 or 78, but the data packet format is self-contained Adaptive conversion (symbol and conjugate transformation), ie, data packet (S ⁇ -S ⁇ ).
  • the transmitted data packet format from RS1 and RS2 will form a codeword that conforms to the spatial diversity coding. Codewords that conform to the STBC/SFBC encoding rules.
  • the MS uses the slightly modified existing STBC/SFBC detection scheme (ie, in equation (7) below) Addition), combining data packets received from RSs with low access link power with data packets previously received from the BS via direct link (preferably, maximum ratio combining), access of lower power RSs
  • the power is thereby compensated so that the diversity gain of the STBC/SFBC over the relay link can be maximized, which in turn improves the performance of the wireless communication system.
  • the relay RS implements cooperative relaying, which can be extended to cooperation between the BS and the RS, or for cooperation between multiple transmitting stations of the uplink or downlink.
  • the transmitting device is an MS
  • the receiving device is a switching technology, which also enhances the existing distributed STBC.
  • the received signal can be expressed as follows:
  • equation (1) can be written as follows:
  • the existing Alamouti is based on spatial direction coding for two-antenna STBC coding, that is, the first antenna transmits (S 1 ; -S 2 * ) and the second antenna transmits (S 2 , S ⁇ ), which is different from the spatial direction.
  • the existing Alamouti coding method after considering the data format transmitted on the direct link, the improved Alamouti code proposed by the present invention transmits a data packet (SS 2 ) at the first antenna (ie, at RS1) and at the second antenna. (ie at RS2) Send ( ), that is, encoding data packets based on the time direction. It can be seen that it is assumed here that the RS1 access link power is low, thus maintaining the same data packet format as the BS.
  • the signal received by the MS from the access link can be written as follows:
  • a and are channel state information on the access link from RSI and RS2 to the MS, respectively, assuming that there is a power difference between RS1 and RS2, and the access link power of RS1 to MS is low, so
  • the signals are respectively transmitted in two consecutive time slots, and s 2 ) a RS2 to the MS have high access link power, so that they respectively transmit the format-converted signals in two consecutive time slots, correspondingly ( 3) can be expressed as follows:
  • Equation (5) can be expressed in the following matrix form:
  • the channel state information matrix h reaches the third-order diversity gain, and in the prior system shown in FIG. 1, the distributed STBC can only obtain the two-order diversity gain, which is increased by one.
  • the order gain is derived from the data diversity of equation (2) and RS1 transmission, such as maximum ratio combining (MRC).
  • MRC maximum ratio combining
  • the power of the low access link is improved by increasing this order diversity gain to eliminate power imbalance.
  • Similar to the STBC algorithm it is assumed that the channel is invariant between the corresponding two consecutive time slots on the direct link, using the existing STBC detection algorithm, multiplying equation (6) by h*, sending The data packet can be recovered as follows.
  • the time diversity gain obtained by maximum ratio combining (MRC) can be used to compensate the RS with low access power, so that the RS reaches equal power or roughly balanced power, thereby Maximize the diversity gain between STBCs on the relay link.
  • the RS or BS with low access link power transmits a data packet having the same encoding format as the BS on the direct link. Therefore, when receiving device MS When the channel quality information (eg, signal-to-noise ratio SNR) of the two access links is fed back to the RS, RS1 and RS2 themselves will adaptively determine the STBC encoding format, ie, the RS with low access link power is in the access chain. Another RS transmitted in consecutive time slots of the path with high access link power is transmitted in consecutive time slots of the access link (- ⁇ , ⁇ .
  • SNR signal-to-noise ratio
  • the performance of the adaptive cooperative relay transmission scheme can be simulated, and for comparison purposes, the non-coordinated multi-hop relay based on the OFDM downlink system and the distributed STBC are also simulated, where In the simulation, cooperation is performed between the BS and the RS.
  • Table 1 shows the parameter settings for the simulation.
  • Fig. 8 illustrate the comparison of the packet error rate (BLER) performance in the above three cases.
  • BLER packet error rate
  • the path loss exponent is 4
  • the power difference is approximately 13 dB.
  • the adaptive cooperation scheme proposed by the present invention can be extended to an SFBC-based cooperative relay wireless communication system. Similar to the description of the implementation of the STBC, the use of the proposed method in SFBC-based cooperative relaying is described below by way of formulation.
  • Figure 10 depicts the simulation deployment diagram for the system.
  • the network of sectorized cells is formed with 7 cells and each cell includes 3 sectors. In each sector, two repeaters are deployed with a radius of the BS 2/3 cell.
  • the simulation parameters are shown in Table 2.
  • Figure 11 shows the simulation results.
  • SINR signal-to-interference-and-noise ratio
  • the present invention can take the form of an entirely hardware implementation, an entirely software implementation, or an implementation comprising both a hardware unit and a software unit.
  • the invention is implemented in software including, but not limited to, firmware, resident software, microcode, and the like.

Landscapes

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

Abstract

L’invention concerne un procédé et un équipement de relais coopératif dans un système de communication sans fil, le procédé comprenant les étapes suivantes : réception de paquets de données transmis par un dispositif émetteur par l’intermédiaire de liaisons de relais; modification adaptative du format des paquets de données destinés à être transmis à un dispositif récepteur par l’intermédiaire de liaisons d’accès, compte tenu de la différence de puissance entre des stations de relais coopératif de manière à combiner dans le dispositif récepteur les paquets de données reçus du dispositif émetteur par l’intermédiaire d’une liaison directe et les paquets de données reçus d’une station de relais coopératif présentant une faible puissance de liaison d’accès par l’intermédiaire d’une liaison d’accès, et à obtenir une diversité d’espace entre les stations de relais coopératif; et transmettre les paquets de données au dispositif récepteur par l’intermédiaire des liaisons d’accès. Le procédé et l’équipement selon l’invention permettent de réduire voire d’éliminer le déséquilibre de puissance des liaisons d’accès existant dans le relais coopératif et de maximiser le gain de diversité pour améliorer ainsi les performances du système de communication sans fil.
PCT/CN2009/073358 2009-08-19 2009-08-19 Procédé et équipement de relais coopératif dans un système de communication sans fil WO2011020243A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2009/073358 WO2011020243A1 (fr) 2009-08-19 2009-08-19 Procédé et équipement de relais coopératif dans un système de communication sans fil
CN200980159868.3A CN102474388B (zh) 2009-08-19 2009-08-19 用于无线通信系统中协作中继的方法和设备

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2009/073358 WO2011020243A1 (fr) 2009-08-19 2009-08-19 Procédé et équipement de relais coopératif dans un système de communication sans fil

Publications (1)

Publication Number Publication Date
WO2011020243A1 true WO2011020243A1 (fr) 2011-02-24

Family

ID=43606545

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2009/073358 WO2011020243A1 (fr) 2009-08-19 2009-08-19 Procédé et équipement de relais coopératif dans un système de communication sans fil

Country Status (2)

Country Link
CN (1) CN102474388B (fr)
WO (1) WO2011020243A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103188005A (zh) * 2011-12-30 2013-07-03 中国移动通信集团公司 一种实现终端通信的方法、系统以及装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106603431B (zh) * 2016-12-15 2020-09-04 中国科学院沈阳自动化研究所 基于混合关键任务的工业无线网络数据调度方法及装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1849768A (zh) * 2003-09-12 2006-10-18 沃达弗纳控股有限公司 用于在无线中继电路中使用协作分集的方法和系统
CN101237307A (zh) * 2008-03-05 2008-08-06 中科院嘉兴中心微系统所分中心 基于分布式空时分组码译码转发的无线传感网协同分集方案

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE0403218D0 (sv) * 2004-12-30 2004-12-30 Ericsson Telefon Ab L M Method and apparatus relating to communication-
CN104601215A (zh) * 2008-01-02 2015-05-06 交互数字技术公司 中继节点、网络节点及在中继节点中使用的方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1849768A (zh) * 2003-09-12 2006-10-18 沃达弗纳控股有限公司 用于在无线中继电路中使用协作分集的方法和系统
CN101237307A (zh) * 2008-03-05 2008-08-06 中科院嘉兴中心微系统所分中心 基于分布式空时分组码译码转发的无线传感网协同分集方案

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
NI, WEI ET AL.: "Cooperative Relaying with Spatial Diversity and Multiplexing", IEEE 802.16 BROADBAND WIRELESS ACCESS WORKING GROUP, 29 August 2007 (2007-08-29), pages 2 - 5, Retrieved from the Internet <URL:http://ieee802.org/16> *
SHEN, GANG ET AL.: "Multi-hop relay for next-generation wireless access networks", BELL LABS TECHNICAL JOURNAL, vol. 13, no. ISS.4, 25 February 2009 (2009-02-25), pages 175 - 193 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103188005A (zh) * 2011-12-30 2013-07-03 中国移动通信集团公司 一种实现终端通信的方法、系统以及装置
WO2013097633A1 (fr) * 2011-12-30 2013-07-04 中国移动通信集团公司 Procédé, système et dispositif pour mettre en œuvre des communications de terminaux
CN103188005B (zh) * 2011-12-30 2016-06-22 中国移动通信集团公司 一种实现终端通信的方法、系统以及装置

Also Published As

Publication number Publication date
CN102474388B (zh) 2014-10-01
CN102474388A (zh) 2012-05-23

Similar Documents

Publication Publication Date Title
US8081721B2 (en) Method and arrangement in wireless communication networks using relaying
JP4937403B2 (ja) 基地局装置および送信信号形成方法
US7406060B2 (en) Coverage improvement in wireless systems with fixed infrastructure based relays
EP1989788B1 (fr) Réseau et procédé pour créer une interface de canal à entrée multiple/sortie multiple (mimo)
KR101710616B1 (ko) 업링크 송신 다이버시티를 위한 시그널링 및 채널 추정
Zhang et al. Cooperative OFDM channel estimation in the presence of frequency offsets
Miyano et al. Cooperative relaying scheme with space time code for multihop communications among single antenna terminals
KR101417234B1 (ko) 다운링크에서의 사용자 장비에 적합한 중계 기법
Adachi et al. Distributed antenna network for gigabit wireless access
JP4857219B2 (ja) 無線通信システム及び中継無線装置
US20130208654A1 (en) Communication device, communication method and communication system
Patil On throughput performance of decode and forward cooperative relaying with packet combining and ARQ
KR101102084B1 (ko) 협력 중계 장치 및 협력 중계 방법과, 협력 중계 방식 기반의 무선 네트워크 시스템
WO2011020243A1 (fr) Procédé et équipement de relais coopératif dans un système de communication sans fil
Miyano et al. Space time coded cooperative relaying technique for multihop communications
Verde et al. Decentralized space-time block coding for two-way relay networks
WO2009039678A1 (fr) Procédé et appareil de relais combiné pour une pluralité de stations relais dans un réseau de communication sans fil
Alotaibi et al. Full-rate and full-diversity extended orthogonal space-time block coding in cooperative relay networks with imperfect synchronization
Chraiti et al. Distributed Alamouti full-duplex relaying scheme with direct link
Osseiran et al. Distributed relay diversity systems for OFDM-based networks
Moço et al. Multiple antenna relay-assisted schemes for the uplink OFDM based systems
Yang et al. Dynamic decode-and-forward and amplify-and-forward cooperative strategy using distributed space-time code in uplink MIMO systems with multiple relays
CN102577475A (zh) 利用基于波束成形的协同复用传送数据分组的方法和设备
Moço et al. Single and multiple antenna relay-assisted techniques for uplink and downlink OFDM systems
Miyazaki et al. Joint Tx/Rx FDE & spectrum combining for SC-ANC bi-directional relay in presence of timing offset

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200980159868.3

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09848384

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 09848384

Country of ref document: EP

Kind code of ref document: A1