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WO1997048192A1 - Procede pour separer un melange de signaux reçus - Google Patents

Procede pour separer un melange de signaux reçus Download PDF

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Publication number
WO1997048192A1
WO1997048192A1 PCT/DE1997/001160 DE9701160W WO9748192A1 WO 1997048192 A1 WO1997048192 A1 WO 1997048192A1 DE 9701160 W DE9701160 W DE 9701160W WO 9748192 A1 WO9748192 A1 WO 9748192A1
Authority
WO
WIPO (PCT)
Prior art keywords
subscriber
matrix
received signal
specific
channel equalization
Prior art date
Application number
PCT/DE1997/001160
Other languages
German (de)
English (en)
Inventor
Anja Klein
Paul Walter Baier
Bernd Steiner
Peter Jung
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to EP97928111A priority Critical patent/EP0904640A1/fr
Publication of WO1997048192A1 publication Critical patent/WO1997048192A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H21/00—Adaptive networks
    • H03H21/0012—Digital adaptive filters
    • 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
    • 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
    • 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
    • H04L25/03987—Equalisation for sparse channels
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H21/00—Adaptive networks
    • H03H21/0012—Digital adaptive filters
    • H03H21/0025—Particular filtering methods
    • H03H2021/0034—Blind source separation
    • 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
    • H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
    • H04L2025/03375—Passband transmission
    • 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
    • H04L2025/03592—Adaptation methods
    • H04L2025/03598—Algorithms
    • H04L2025/03605—Block algorithms
    • 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
    • H04L25/0202—Channel estimation
    • H04L25/024—Channel estimation channel estimation algorithms
    • H04L25/0242—Channel estimation channel estimation algorithms using matrix methods

Definitions

  • the invention relates to a method for separating a received signal mix according to the preamble of claim 1.
  • the reception-side separation of a signal mixture in the context of a multi-subscriber signal transmission system is required, for example, on the reception side of the downlink of mobile radio systems in which a fixed base station communicates with a large number of mobile stations can.
  • the base station wants to communicate with K subscriber stations in a mobile radio system at the same time. It must therefore be ensured that in the downlink the signal coming from the base station and intended for one of the K subscriber stations can be separated from the signals intended for other subscriber stations in the relevant subscriber station. Such separation is made possible by using multiple access methods.
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • CDMA code division multiple access
  • CDMA Code Division Multiple Access
  • the K subscriber signals which each consist of a data sequence with data symbols strung together, differ in the CDMA spreading codes contained in the data symbols, which are also called signatures.
  • the following considerations gen primarily concern systems using CDMA.
  • the applicability of the method according to the invention is not limited to CDMA systems.
  • the separation of a signal mixture which corresponds to a data estimate in CDMA systems, can be accomplished in a known manner by means of signal-adapted filtering (MF, Matched Filtering), which is adapted to the CDMA spreading code of the subscriber.
  • MF Matched Filtering
  • the transmission of the sum signal s over a mobile radio channel 4 with the impulse response h can be done by multiplication with a matrix
  • a combined channel impulse response arises here by discrete folding of a CDMA code c (k) with a time-discrete channel impulse response h with W channel parameters.
  • the sum signal s is thus transmitted via a mobile radio channel 4 with the impulse response h.
  • the reception signal e results after the addition of a noise signal n symbolized by a summing element 6.
  • the received signal e is processed further in a channel equalizer 7 in order to obtain an estimated value s for the transmitted sum signal s.
  • the method according to the invention is particularly advantageous if the subscriber-specific CDMA codes are orthogonal. In contrast to the JD algorithm and the IC algorithm, only the channel impulse response h and the subscriber-specific CDMA code, but not the CDMA code of the other subscribers, need to be known in the receiver 5 of the subscriber k.
  • the ZF or MMSE criterion can be used in the channel equalizer 7, similarly to the algorithm used in connection with the joint detection (JD, Joint Detection). The estimates for the case of uncorrelated noise n with the variance ⁇ 2 when using the IF criterion and when using the MMSE criterion
  • R s E (s * s * T ) is the covariance matrix of the sum signal s.
  • the data estimates) c, MMSE according to the MMSE criterion additionally contain an intersymbol (ISI) and multiple access (MAI) interference component.
  • ISI intersymbol
  • MAI multiple access
  • the dimension of the matrix is increased. This reduces the systematic error and thus the additional disruption that the right-hand circular expansion causes, particularly with the first and last data symbols of each participant. It also enables the dimension of the matrix to be a power of two, so that the fast Fourier transform (FFT, Fast Fourier Transform) can be used to solve the problem in the frequency domain.
  • FFT Fast Fourier transform
  • the main diagonals of the matrix are added the same value ⁇ 2 z and not a higher value for the more disturbed first and last data symbols of a participant, so that the right-hand circular structure of the matrix is preserved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Dans un système radio à plusieurs abonnés (1), dans lequel une forme propre aux abonnés est appliquée aux signaux, après une transmission intervenant par l'intermédiaire d'un et d'un même canal de transmission (4), le mélange de signaux reçus dans un poste d'abonné (5), est séparé en deux étapes d'une manière spécifique adaptée aux abonnés concernés. Une égalisation (7) des canaux est effectuée dans une première étape. Dans la seconde étape, un filtrage (8) est ensuite effectué, les coefficients de filtrage étant déterminés à partir de la forme du signal propre à l'abonné concerné. Ce procédé s'utilise pour la liaison descendante (downlink) d'un système radio mobile fonctionnant par accès multiple par code de répartition.
PCT/DE1997/001160 1996-06-13 1997-06-09 Procede pour separer un melange de signaux reçus WO1997048192A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97928111A EP0904640A1 (fr) 1996-06-13 1997-06-09 Procede pour separer un melange de signaux re us

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996123665 DE19623665C1 (de) 1996-06-13 1996-06-13 Verfahren zum Separieren eines empfangenen Signalgemisches
DE19623665.7 1996-06-13

Publications (1)

Publication Number Publication Date
WO1997048192A1 true WO1997048192A1 (fr) 1997-12-18

Family

ID=7796886

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1997/001160 WO1997048192A1 (fr) 1996-06-13 1997-06-09 Procede pour separer un melange de signaux reçus

Country Status (3)

Country Link
EP (1) EP0904640A1 (fr)
DE (1) DE19623665C1 (fr)
WO (1) WO1997048192A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7042967B2 (en) 2003-03-03 2006-05-09 Interdigital Technology Corporation Reduced complexity sliding window based equalizer
US7428279B2 (en) 2003-03-03 2008-09-23 Interdigital Technology Corporation Reduced complexity sliding window based equalizer
EP2271037A1 (fr) * 2009-07-03 2011-01-05 Universität Duisburg-Essen Calcul en domaine fréquentiel pour le précodage pour canaux à plusieurs entrées et sorties

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19826036C2 (de) * 1998-06-12 2000-05-25 Bosch Gmbh Robert Verfahren zur Trennung von mehreren überlagerten codierten Nutzersignalen
FR2783987B1 (fr) * 1998-09-11 2006-08-04 Commissariat Energie Atomique Procede de reception de signaux amrc a suppression parallele d'interferences, etage et recepteur correspondants
US8831130B1 (en) 1999-10-16 2014-09-09 Ipcom Gmbh & Co. Kg Channel estimate predicted from several previous channel estimates, for pre-equalization
DE19950021A1 (de) * 1999-10-09 2001-11-08 Bosch Gmbh Robert Datenübertragungsverfahren
DE10206966B4 (de) 2002-02-19 2011-08-11 Rohde & Schwarz GmbH & Co. KG, 81671 Verfahren zum Schätzen von Verstärkungsfaktoren eines CDMA-Signals
CN100459474C (zh) * 2002-10-24 2009-02-04 华为技术有限公司 码分多址系统中的多径搜索方法及装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996006487A1 (fr) * 1994-08-25 1996-02-29 Nokia Telecommunications Oy Methode de reception cdma et recepteur

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996006487A1 (fr) * 1994-08-25 1996-02-29 Nokia Telecommunications Oy Methode de reception cdma et recepteur

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
KLEIN A ET AL: "ZERO FORCING AND MINIMUM MEAN-SQUARE-ERROR EQUALIZATION FOR MULTIUSER DETECTION IN CODE-DIVISION MULTIPLE-ACCESS CHANNELS", IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, vol. 45, no. 2, May 1996 (1996-05-01), pages 276 - 287, XP000598095 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7042967B2 (en) 2003-03-03 2006-05-09 Interdigital Technology Corporation Reduced complexity sliding window based equalizer
US7428279B2 (en) 2003-03-03 2008-09-23 Interdigital Technology Corporation Reduced complexity sliding window based equalizer
US7609794B2 (en) 2003-03-03 2009-10-27 Interdigital Technology Corporation Reduced complexity sliding window based equalizer
EP2271037A1 (fr) * 2009-07-03 2011-01-05 Universität Duisburg-Essen Calcul en domaine fréquentiel pour le précodage pour canaux à plusieurs entrées et sorties

Also Published As

Publication number Publication date
EP0904640A1 (fr) 1999-03-31
DE19623665C1 (de) 1997-04-30

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