[go: up one dir, main page]

WO2010069098A1 - Procédé d'émission dans un système de communications sans fil - Google Patents

Procédé d'émission dans un système de communications sans fil Download PDF

Info

Publication number
WO2010069098A1
WO2010069098A1 PCT/CN2008/073515 CN2008073515W WO2010069098A1 WO 2010069098 A1 WO2010069098 A1 WO 2010069098A1 CN 2008073515 W CN2008073515 W CN 2008073515W WO 2010069098 A1 WO2010069098 A1 WO 2010069098A1
Authority
WO
WIPO (PCT)
Prior art keywords
antennas
antenna
encoded
symbols
symbol
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/CN2008/073515
Other languages
English (en)
Inventor
Mattias Wennstrom
Jaap Van De Beek
Branislav Popovic
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.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
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 Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to PCT/CN2008/073515 priority Critical patent/WO2010069098A1/fr
Priority to CN200880132081.3A priority patent/CN102150371B/zh
Publication of WO2010069098A1 publication Critical patent/WO2010069098A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • H04L1/02—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
    • H04L1/0606—Space-frequency 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
    • H04L1/0643—Properties of the code block codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices

Definitions

  • the present invention relates to transmission in a wireless communication system and more particularly to a method in a transmitter which comprises a plurality of transmit antennas. Furthermore, a transmitter device relating to the method is disclosed.
  • a transmission scheme can be selected in a plethora of different ways depending on the aim of a transmission.
  • the transmission schemes can heuristically be categorized into two groups, namely those providing diversity and those providing capacity. However, some transmission schemes provide both capacity and diversity.
  • transmit diversity schemes To increase the reliability of a wireless link, transmit diversity schemes have been proposed in prior art. Most transmit diversity schemes are often designed to maintain a simple receiver structure, and these schemes commonly operate well with a single receive antenna. Transmit diversity has a low spectral efficiency, but it is possible to increase the spectral efficiency slightly if transmit diversity is used in conjunction with e.g. link adaptation.
  • each information bit or symbol may be transmitted from more than one transmit antenna.
  • each bit or symbol will pass through at least two different fading channels, and by proper combining in the receiver, diversity is obtained.
  • a straightforward approach is therefore to transmit the same symbol from all available transmit antennas.
  • transmitted symbols may destructively interfere in the receiver due to the fading in the channel, and performance gain is lost.
  • Use of multiple receive antennas may circumvent this detrimental condition of destructive combining, but will increase the cost and complexity of the receiver.
  • STC orthogonal Space Time Code
  • the STC is a well known transmit diversity scheme, which through the design of the code allows for single antenna reception.
  • STC from orthogonal designs also avoid signal cancellation at the receiver antennas by transmitting different symbols from different antennas at each transmission instant. Instead, multiple transmission instants are used to make sure that each symbol is transmitted from more than one antenna, thereby obtaining transmit diversity.
  • the symbols are coded (distributed) over multiple antennas and multiple symbol intervals in time. Is not necessary to use time as a second dimension, which is the case in space time codes.
  • this so called auxiliary dimension may be frequency which will give a Space- Frequency Code (SFC) and the encoder then uses multiple symbol intervals in the frequency domain.
  • SFC Space- Frequency Code
  • the notation STC will be used for simplicity but it shall be understood that other auxiliary dimensions than time may be used.
  • SMUX Spatial Multiplexing
  • ISI Inter Stream Interference
  • MIMO Multiple Input Multiple Output
  • SM Spatial Modulation
  • a transmitter uses information bits at the transmitter side to select a modulation constellation symbol and to select an antenna from which the symbol shall be transmitted. It is then the receiver's task to detect which modulation symbol that was transmitted and from which antenna.
  • GSSK Generalized Space Shift Keying
  • the present invention aims to provide a transmission scheme for a wireless communications system with high spectral efficiency for a transmitter with a plurality of transmit antennas.
  • the spectral efficiency may be improved compared to solutions according to prior art since the transmission scheme allows for selection of K out of N antennas for transmission and uses non-trivial modulation constellations on the selected antennas.
  • a transmission scheme allows for encoding of the modulated symbols to be transmitted from the K selected antennas and over T symbol intervals in an auxiliary dimension such as e.g. time or frequency, thereby avoiding signal cancellation in the receiver.
  • transmit diversity encoding is preferably used on the modulated symbols to be transmitted from the K selected antennas and over T symbol intervals providing diversity gain for both coded bits and uncoded bits, thereby ensuring diversity gain also at higher code rates.
  • Figure 1 shows an embodiment of the present invention
  • FIG. 2 shows an embodiment of the present invention where a Generalized Antenna Modulation (GAM) encoder comprises a modulator and a transmit diversity encoder;
  • - Figure 3 shows an embodiment of the present invention where a GAM encoder comprises a modulator and an Alamouti orthogonal block code encoder;
  • GAM Generalized Antenna Modulation
  • FIG. 4 shows an embodiment of the present invention where a GAM encoder comprises a spatial multiplexer
  • Figure 5 shows an example of an embodiment of the present invention where a transmitter comprises a plurality of distributed antennas
  • Figure 6 shows simulations results for a transmission scheme according to the present invention.
  • Figure 7 shows additional simulation results for a transmission scheme according the present invention.
  • SM Spatial Modulation
  • K out of N antennas always gives more combinations than selecting 1 out of N antennas and thus the former selection contains more information.
  • an Antenna Selection Modulation (ASM) method comprising a Generalized Antenna Modulation (GAM) encoder and an antenna selection encoder.
  • the GAM encoder takes at least one input bit and outputs K output signals over T symbol intervals, where 1 ⁇ K
  • the antenna selection encoder takes at least one input bit and selects and holds K out of N antennas for transmission of the K output signals for a period of T symbol transmission intervals, where N denotes the number of transmit antennas at the transmitter and where 1 ⁇ K ⁇ N.
  • the antenna selection encoder receives the bits for antenna selection and outputs the K indices of the antennas to be activated and used for the transmission of the output from the GAM encoder.
  • a general idea with the present invention is to use additional dimensions in the encoding of bits to be transmitted by antennas selected by antenna selection bits. The additional dimensions are visible in the output of the GAM encoder which outputs K > 1 encoded symbols over T > 1 symbol intervals.
  • the transmitter comprises a plurality of N transmit antennas for transmitting signals in a wireless communication system.
  • An input signal is received which comprises a plurality of bits for transmission (a(k) ).
  • the plurality of received bits can be blocks of encoded bits constituting code words for transmission, but can also be a stream of uncoded bits.
  • the received bits are separated in a bit separator into r e bits (or at least one bit) to be encoded and r a bits (or at least one bit) for antenna selection.
  • the resulting r e bits from the bit separator equipment to be encoded are provided to a GAM encoder, where the r e bits in this case are encoded generating K encoded output symbols over T symbol transmission intervals, i.e. T sets of K encoded symbols are obtained.
  • the r a bits for antenna selection are provided to an antenna selection encoder, wherein each of the
  • N transmit antennas has a unique antenna index.
  • the antenna selection encoder selects K antenna indices associated with K transmit antennas to be activated out of the plurality of N transmit antennas.
  • the antenna selection encoder holds the selection of K out of N associated antennas for transmission of the GAM over T symbol transmission intervals; the antenna selection encoder holds the selection synchronized with the ASM output signals over T symbol intervals.
  • T sets of K encoded symbols are transmitted over T symbol intervals, respectively, and each of the K encoded symbols is transmitted on one of the K selected transmit antennas associated with the K antenna indices, respectively.
  • FIG. 2 Another embodiment of a transmission scheme according to the present invention is shown in Figure 2.
  • An ASM-TXD (Antenna Selection Modulation, transmit diversity) scheme is employed in this embodiment, hence the GAM encoder equipment comprises a symbol modulator and a transmit diversity (TXD) encoder in this example embodiment.
  • An orthogonal STC might be used in the transmit diversity encoder, e.g. a two dimensional STC utilizing the space dimension and one additional auxiliary dimension such as time or frequency.
  • a two dimensional design such as the orthogonal STC requires that the channel is invariant over T symbol intervals of the auxiliary dimension in order to keep the orthogonality. Therefore, the selection of K out of N antennas by the antenna selection encoder must hold the antenna selection constant for at least T> 1 symbol time intervals or, correspondingly, frequency bins.
  • STBC Space-Time Block Code
  • SFBC Space Frequency Block Code
  • An exemplary embodiment of an ASM-TXD encoder employing an Alamouti encoder is shown in Figure 3.
  • a block of 21og 2 M bits is modulated to produce a block of two modulated symbols s k , s k+l , respectively, each taken from a symbol constellation of M symbols.
  • Aux dim 1 Aux dim 2 where the rows are transmitted from different antennas and the columns are transmitted through the different auxiliary dimensions (as mentioned above, examples of auxiliary dimensions are time and frequency).
  • an ASM-SMUX scheme is employed, which is shown in Figure 4.
  • the GAM encoder comprises a bit selector and K symbol modulators.
  • T 1 in this case since there is no encoding over auxiliary dimensions as in the previous ASM-TXD embodiments.
  • the K output symbols are mapped to the K out of N transmit antennas selected by the antenna selection encoder using K antenna indices associated with K transmit antennas.
  • the total number of transmitted bits per channel use is therefore with ASM- SMUX bits, which is an increased number of transmitted bits compared
  • a transmitter comprises a plurality of transmit antennas, wherein the plurality of transmit antennas are distributed antennas consisting each of a plurality of antenna elements.
  • the antenna elements that transmit the same signal define an antenna port.
  • the plurality of antenna elements of an antenna port may be geographically separated to obtain a wide coverage of a transmitted signal from each antenna port, such as for a 3GPP MBSFN.
  • An example embodiment according to invention with a transmitter as described above is shown in Figure 5.
  • a transmitter comprises three geographically separated transmitters, each with antenna elements 1 and 2, respectively, which transmits signals to a receiver.
  • Antenna element 1 in transmitters 1-3 defines antenna port 1, and thus transmits the same signal.
  • antenna element 2 in transmitters 1-3 defines antenna port 2, and therefore transmits the same signal, which is different from what is transmitted on antenna port 1.
  • antenna port 1 there are only two transmit antennas or, antenna ports, in this exemplified system since the receiver can not distinguish the signals from the individual antenna elements within each antenna port.
  • a plurality of transmit antennas correspond to a plurality of antenna ports.
  • Figure 6 and 7 shows simulation results for transmission schemes according to the present invention.
  • the fading channel was modelled according to the 3GPP Typical Urban (TU) channel model and a 3GPP ReI.8 Turbo encoder was used for the comparison.
  • the results are given as the block error rate (BLER) as a function of the transmit signal power to receive noise power ratio (denoted SNR).
  • BLER block error rate
  • the simulations show that the present invention with an ASM-TXD embodiment has the lowest BLER of the three compared schemes.
  • the Alamouti encoder with frequency as auxiliary dimension, where ten bits are input to the bit separator, wherein two of the bits are used for antenna selection encoding and eight of the bits are used for Alamouti encoding two 16QAM symbols, respectively.
  • the two bits for antenna selection are used to select antennas in pairs such as e.g. (1,2), (3,4), (5,6) or (7,8).
  • the results for SFBC+FSTD with 16QAM and for SM, where three bits select one antenna out of eight, and four bits select a 16QAM modulation symbol are also shown in Figure 7, where the solid lines are results using four receive antennas and dashed lines are with two receive antennas.
  • the ASM-TXD scheme shows the best performance among the compared schemes.
  • the corresponding threshold for two receive antennas is 700/168 ⁇ 4.2 information bits per channel use.
  • the method for transmitting signals from a transmitter which comprises a plurality of transmit antennas and processing circuitry operating according to the method, is suitable for implementing based upon a computer program, having code means, which when run in a computer causes the computer to execute the steps of the method.
  • the computer program is preferably included in a computer readable medium of a computer program product.
  • the computer readable medium may consist of essentially any memory, such as a ROM (Read-Only Memory), a PROM (Programmable Read-Only Memory), an EPROM (Erasable PROM), a Flash memory, an EEPROM (Electrically Erasable PROM), or a hard disk drive.

Landscapes

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

Abstract

La présente invention concerne un procédé d'émission dans un système de communications sans fil, et plus particulièrement un procédé mis en œuvre dans un émetteur comportant une pluralité d'antennes d'émission. Un mode de réalisation illustratif de l'invention comporte une étape consistant à coder des signaux en vue de leur émission et assure une émission sur un nombre choisi d'antennes d'émission.
PCT/CN2008/073515 2008-12-15 2008-12-15 Procédé d'émission dans un système de communications sans fil Ceased WO2010069098A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2008/073515 WO2010069098A1 (fr) 2008-12-15 2008-12-15 Procédé d'émission dans un système de communications sans fil
CN200880132081.3A CN102150371B (zh) 2008-12-15 2008-12-15 在无线通信系统中进行传输的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2008/073515 WO2010069098A1 (fr) 2008-12-15 2008-12-15 Procédé d'émission dans un système de communications sans fil

Publications (1)

Publication Number Publication Date
WO2010069098A1 true WO2010069098A1 (fr) 2010-06-24

Family

ID=42268245

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2008/073515 Ceased WO2010069098A1 (fr) 2008-12-15 2008-12-15 Procédé d'émission dans un système de communications sans fil

Country Status (2)

Country Link
CN (1) CN102150371B (fr)
WO (1) WO2010069098A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102404088A (zh) * 2011-07-21 2012-04-04 京信通信系统（中国）有限公司 基于线性离散码的多用户分集方法及装置
WO2012048218A1 (fr) * 2010-10-07 2012-04-12 Research In Motion Limited Codes rares pour canal mimo et variantes de détecteurs pour code rare

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1497988A (zh) * 2002-09-30 2004-05-19 ���ǵ�����ʽ���� 移动通信系统中采用多天线发射和接收信号的装置及方法
CN1541465A (zh) * 2001-02-27 2004-10-27 Toa��ʽ���� 发送器与接收器
CN1815941A (zh) * 2005-02-04 2006-08-09 松下电器产业株式会社 多天线传输系统中的天线选择和比特分配方法及装置
WO2007081181A2 (fr) * 2006-01-13 2007-07-19 Lg Electronics Inc. Procédé et appareil destinés à obtenir une diversité d'émission et un multiplexage spatial au moyen d'une sélection d'antenne basée sur des informations de rétroaction
CN101015137A (zh) * 2004-07-13 2007-08-08 三星电子株式会社 用于在多天线系统中进行波束形成的设备和方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1541465A (zh) * 2001-02-27 2004-10-27 Toa��ʽ���� 发送器与接收器
CN1497988A (zh) * 2002-09-30 2004-05-19 ���ǵ�����ʽ���� 移动通信系统中采用多天线发射和接收信号的装置及方法
CN101015137A (zh) * 2004-07-13 2007-08-08 三星电子株式会社 用于在多天线系统中进行波束形成的设备和方法
CN1815941A (zh) * 2005-02-04 2006-08-09 松下电器产业株式会社 多天线传输系统中的天线选择和比特分配方法及装置
WO2007081181A2 (fr) * 2006-01-13 2007-07-19 Lg Electronics Inc. Procédé et appareil destinés à obtenir une diversité d'émission et un multiplexage spatial au moyen d'une sélection d'antenne basée sur des informations de rétroaction

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012048218A1 (fr) * 2010-10-07 2012-04-12 Research In Motion Limited Codes rares pour canal mimo et variantes de détecteurs pour code rare
CN103262453A (zh) * 2010-10-07 2013-08-21 捷讯研究有限公司 用于mimo信道的稀疏码以及用于稀疏码的检测器备选
US9231677B2 (en) 2010-10-07 2016-01-05 Blackberry Limited Sparse codes for MIMO channel and detector alternatives for sparse code
CN103262453B (zh) * 2010-10-07 2017-03-08 黑莓有限公司 用于mimo信道的稀疏码以及用于稀疏码的检测器备选
CN102404088A (zh) * 2011-07-21 2012-04-04 京信通信系统（中国）有限公司 基于线性离散码的多用户分集方法及装置

Also Published As

Publication number Publication date
CN102150371B (zh) 2013-08-07
CN102150371A (zh) 2011-08-10

Similar Documents

Publication Publication Date Title
KR101299386B1 (ko) 개선된 다중 입력 다중 출력 인터리빙 방법 및 인터리버 시스템
CA2575701C (fr) Appareil et procede de codage de bloc espace-temps-frequence a l'aide d'indicateurs de qualite du canal
US9509384B2 (en) System and method for mapping symbols for MIMO transmission
KR101643439B1 (ko) 다중 반송파 전송을 위한 공간 경로를 생성하는 비트 스트림의 분할
EP1608081A2 (fr) Dispositif et procédé pour le codage/décodage espace-fréquence dans un système de communication
JP5237290B2 (ja) 少なくとも２つのアンテナを有する無線システムにおいてデータのストリームを送信する方法および該方法を実装した送信機
KR100688120B1 (ko) 무선통신시스템에서 시공간 주파수 블록 부호화 장치 및방법
EP1701464A1 (fr) Procédé et dispositif pour le mappage de donées codés en temps et en espace sur sous-porteuses dans un système sans fil de communication large bande
US20060093066A1 (en) Apparatus and method for space-time-frequency block coding
WO2006049443A1 (fr) Appareil et procede d'emission et de reception de donnees par codage de blocs spatio-temporel
US20080232489A1 (en) Spatial interleaver for MIMO wireless communication systems
MXPA04010118A (es) Multiplexacion espacial ortogonalizada para comunicacion inalambrica.
US20060153312A1 (en) Apparatus and method for space-time frequency block coding in a wireless communication system
KR101639462B1 (ko) 다중 안테나 신호 처리 시스템 및 그 방법
CN101741797B (zh) 多天线广播的发送方法及装置
KR100922957B1 (ko) 다중입출력 통신시스템의 신호검출 장치 및 방법
JP2010504006A (ja) Ｍｉｍｏ無線ネットワークにおける信号のためのサブキャリアマッピングの方法および機器
EP1689108B1 (fr) Appareil de transmission et méthode pour système MIMO
WO2010069098A1 (fr) Procédé d'émission dans un système de communications sans fil
US8929485B2 (en) System and method for broadcast pre-coding in a MIMO system
US7680175B2 (en) Apparatus and method for transmitting/receiving signal in a communication system using a plurality of transmit antennas
CN101459459A (zh) 一种多输入多输出信号的发射方法、系统和装置
CN101534144B (zh) 一种发射机及其发射方法
WO2009066208A2 (fr) Réseau de transmission de données
US20080025198A1 (en) Communication System, Transmitter, Receiver, Transmitting Method, Receiving Method, And Program

Legal Events

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

Ref document number: 200880132081.3

Country of ref document: CN

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

Ref document number: 08878842

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: 08878842

Country of ref document: EP

Kind code of ref document: A1