EP1419605A1 - Procede pour ameliorer la fiabilite de diversite en emission par integration de l'entrelacement des donnees d'emission dans une seule tranche de temps - Google Patents

Procede pour ameliorer la fiabilite de diversite en emission par integration de l'entrelacement des donnees d'emission dans une seule tranche de temps

Info

Publication number
EP1419605A1
EP1419605A1 EP02796256A EP02796256A EP1419605A1 EP 1419605 A1 EP1419605 A1 EP 1419605A1 EP 02796256 A EP02796256 A EP 02796256A EP 02796256 A EP02796256 A EP 02796256A EP 1419605 A1 EP1419605 A1 EP 1419605A1
Authority
EP
European Patent Office
Prior art keywords
data
interleaving
code
applying
spreading
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
EP02796256A
Other languages
German (de)
English (en)
Inventor
Stephen William Wales
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.)
Nokia Solutions and Networks GmbH and Co KG
Original Assignee
Siemens AG
Nokia Siemens Networks GmbH and Co KG
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
Priority claimed from GB0120535A external-priority patent/GB0120535D0/en
Application filed by Siemens AG, Nokia Siemens Networks GmbH and Co KG filed Critical Siemens AG
Publication of EP1419605A1 publication Critical patent/EP1419605A1/fr
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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • 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

Definitions

  • the present invention relates to a method of improving transient diversity reliability.
  • transmit diversity is a known technique which is used to improve down-link reception performance, by providing different transmission paths to a mobile 0 receiver.
  • a base station transmits data from a mobile communication unit (telephone) it can be determined which path i.e. which base station, at that time is able to provide the best reception to 5 signals from the mobile communication unit. Consequently it can be assumed that subsequent reply transmissions, to the mobile communication unit, are also made from the base station that has the best reception. This is because the link can be assumed to be a reciprocal channel i.e. the channel impulse response is the same in both directions. 0
  • Feedback information from a receiver at the mobile communication unit dictates from which base station antenna it is best to transmit. This technique is known as "switched antenna diversity". If characteristic signal fading, applied to each transmission path, is 5 sufficiently decorrelated then the likelihood that all transmission paths suffer equally from signal fading is reduced.
  • the system appears to utilise a parallel or serial concatenated convolutional code.
  • Polynomials output by the generator are mapped to different antennas.
  • Interleavers are part of a normal concatenated code where interleaving is performed between coding steps. Instead of time multiplexing the outputs of different generator polynomials into a single stream, the different generator polynomials are multiplexed to different antennas. Interleaving is performed after error correction coding and not as part of the error correction coding process.
  • a number of transmit diversity schemes have been developed including switched antenna diversity as described above.
  • Delay diversity is also known where the same transmission is made from each antenna but a known delay is deliberately introduced betweentransmissions.
  • different spreading codes or different sets of spreading codes are assigned to different users. If a fixed spreading factor is used, then different transmission rates are accommodated by data being spread by a number of spreading codes by forming a multi-code group. The codes of the multi-code group are transmitted in parallel.
  • a method of transmitting digitised data via at least two transmission paths (channels) includes the step of applying interleaving of data in the space domain.
  • the method is carried out using the steps of: a) coding data by spreading the data using a number of spreading codes; b) applying interleaving to the coded data in the space domain; c) frame segmenting the coded data ; and d) transmitting said frame segmented data via at least two antennae:
  • the inventor has determined a method of overcoming the problems, when using multi-code transmissions where different codes are mapped to different antennas.
  • interleaving is also applied in the time domain.
  • Interleaving is a technique used to prevent severe data loss and acts to spread errors when used with an error correcting code.
  • an interleaved block is obtained.
  • the interleaved block is then segmented and transmitted in different time slots, if a time slotted transmission format is employed.
  • bits of data are shuffled before insertion into the time slots.
  • shuffled data is reordered. If the data in one time slot gets lost, corrupted or destroyed, for example due to fading, then there is a chance that data arriving in a subsequent time slot, remains intact. Errors are thus spread and subsequent application of error correction methods allows lost data to be recovered more effectively.
  • Figure 1 shows a schematic representation of a simple embodiment of the invention showing downlink transmission via multiple antennas using interleaving in the coding (space) domain;
  • Figure 2 shows a further embodiment employing interleaving in both the time and coding (space) domain
  • Figure 3 compares shows a further embodiment of the invention where time domain interleaving is also incorporated.
  • data transmitted is first encoded using a convolutional encoder 1.
  • Other encoders such as a Turbo encoder may alternatively be used.
  • the coded data is interleaved in the space domain before segmentation. This is done by interleaving the data to be transmitted in a single time slot before segmentation 3 into parallel data blocks. Data blocks are transmitted by each code of the multi-code group. This interleaving is hereinafter referred to as interleaving in the space domain and any reference to such should be inte ⁇ reted as above.
  • the data to be transmitted on each code is modulated and spread 4 according to a known spreading function. The data is then transmitted by one of the antennas 5 at the base station.
  • This example is similar to that described in Example 1 above, but includes an extra stage of interleaving in the time domain shown as 7 in Figure 2. Again data is encoded. The resulting data is then interleaved across multiple frames and segmented into data to be transmitted in each frame. Data for one frame is mapped to multiple spreading codes in a single time slot.
  • the above frame interleaving process is essentially time interleaving.
  • Space domain interleaving is then applied. This is done by the following process, as before by applying interleaving to data transmitted within one time slot; i.e. time slot interleaving is a way of applying code domain interleaving
  • data is divided into multiple segments. Each segment is transmitted using a different spreading code.
  • Transmissions are received by a mobile telephone.
  • the signal is de-spread, and is then subjected to a detection process, comprising a channel impulse response estimator and an appropriate detection algorithm.
  • the transmitted signal must support the possibility for the receiver base station to estimate each of the transmission paths to the mobile telephone and to associate respective channel impulse responses with one or more of the spreading codes of the multi-code group. This can be achieved in a number of ways through either code specific known data sequences, for example as used in the UTRA TDD system or through transmit antenna specific known data sequences and knowledge of the antenna code mapping. After detection the data is de-interleaved before being decoded.
  • each burst contains two data fields either side of a known midamble sequence.
  • This unique midamble sequence can be associated with a spreading code according to a default mapping consequently the mobile telephone can obtain a channel estimate associated with each spreading code and this is sufficient for detection pu ⁇ oses.
  • the mobile telephone does not need information concerning the mapping of spreading codes to antennas.
  • Example 2 provide equal performance to that of switched antenna diversity in a TDD system where the reciprocal nature of the channel is used to select from which antenna to transmit.
  • One advantage of space-time interleaving transmit diversity is that it is not reliant upon the presence of any feedback and can be used for common control channels.
  • FIG. 3 An example of the performance achieved using space time interleaving is shown in Figure 3 for a typical multipath channel model.
  • a 64kb/s data channel is encoded using a 1/3 rate Turbo code and transmitted using 6 spreading codes mapped to two antennas.
  • the performance of space-time interleaving (S-TI) is shown to be comparable to switched antenna diversity (SA), which relies upon transmissions from the mobile telephone to determine from which antenna to transmit.
  • SA switched antenna diversity

Abstract

L'invention concerne un procédé permettant, dans un système de télécommunication, d'émettre des données numérisées par l'intermédiaire d'au moins deux voies de transmission (canaux) et comportant comme étape le fait d'appliquer un entrelacement dans le domaine spatial, c.-à-d. un entrelacement dans une seule tranche de temps, ce qui suppose de préférence les étapes suivantes : coder les données par diffusion des données à l'aide d'un nombre de codes de diffusion ; appliquer l'entrelacement dans le domaine spatial ; segmenter les données en trame et émettre lesdites données par l'intermédiaire d'au moins deux antennes. L'entrelacement peut également être appliqué à travers le domaine spatial.
EP02796256A 2001-08-23 2002-08-20 Procede pour ameliorer la fiabilite de diversite en emission par integration de l'entrelacement des donnees d'emission dans une seule tranche de temps Ceased EP1419605A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB0120535A GB0120535D0 (en) 2001-08-23 2001-08-23 Space-time interleaving transmit diversity
GB0120535 2001-08-23
GB0127207A GB2379136B (en) 2001-08-23 2001-11-10 Method of improving transmit diversity reliability
GB0127207 2001-11-10
PCT/EP2002/009344 WO2003019849A1 (fr) 2001-08-23 2002-08-20 Procede pour ameliorer la fiabilite de diversite en emission par integration de l'entrelacement des donnees d'emission dans une seule tranche de temps

Publications (1)

Publication Number Publication Date
EP1419605A1 true EP1419605A1 (fr) 2004-05-19

Family

ID=26246466

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02796256A Ceased EP1419605A1 (fr) 2001-08-23 2002-08-20 Procede pour ameliorer la fiabilite de diversite en emission par integration de l'entrelacement des donnees d'emission dans une seule tranche de temps

Country Status (3)

Country Link
EP (1) EP1419605A1 (fr)
CN (1) CN1309198C (fr)
WO (1) WO2003019849A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7725084B2 (en) * 2003-11-24 2010-05-25 Nokia Corporation Apparatus, and associated method, for communicating communication data in a multiple-input, multiple-output communication system
GB2408898B (en) * 2003-12-02 2006-08-16 Toshiba Res Europ Ltd Improved communications apparatus and methods
DE602004028387D1 (de) * 2004-12-13 2010-09-09 Mitsubishi Electric Corp Verfahren, System und Vorrichtung zur gleichmässig verteilten Datenübertragung in MIMO-Übertragungssystemen
CN101299627B (zh) * 2007-05-03 2012-12-26 上海贝尔股份有限公司 移动终端和发送信息帧的方法
CN101159510B (zh) * 2007-11-16 2011-09-28 海能达通信股份有限公司 一种提高信息比特传输可靠性的方法
US8737502B2 (en) 2009-02-09 2014-05-27 Qualcomm Incorporated Multiplexing and coding schemes for multiple transmit antennas in a wireless communication system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0982870B1 (fr) * 1998-08-21 2008-06-18 Lucent Technologies Inc. Système à AMDC multi-code utilisant une décodage itérative
FI106897B (fi) * 1998-09-14 2001-04-30 Nokia Networks Oy RAKE-vastaanotin
JP2003512761A (ja) * 1999-10-19 2003-04-02 ノキア ネットワークス オサケ ユキチュア 空間及び時間インターリーブによるリンククオリティの最適化

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO03019849A1 *

Also Published As

Publication number Publication date
CN1309198C (zh) 2007-04-04
WO2003019849A1 (fr) 2003-03-06
CN1545780A (zh) 2004-11-10

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