WO2005119998A1 - Procede et dispositif d'evaluation cote recepteur de parametres des co-canaux dans un systeme de radiocommunication - Google Patents

Procede et dispositif d'evaluation cote recepteur de parametres des co-canaux dans un systeme de radiocommunication Download PDF

Info

Publication number
WO2005119998A1
WO2005119998A1 PCT/EP2005/052499 EP2005052499W WO2005119998A1 WO 2005119998 A1 WO2005119998 A1 WO 2005119998A1 EP 2005052499 W EP2005052499 W EP 2005052499W WO 2005119998 A1 WO2005119998 A1 WO 2005119998A1
Authority
WO
WIPO (PCT)
Prior art keywords
channel
data
assigned
channels
sequence
Prior art date
Application number
PCT/EP2005/052499
Other languages
German (de)
English (en)
Inventor
Sabah Badri-Hoeher
Peter Adam Hoeher
Claudiu Krakowski
Wen Xu
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
Publication of WO2005119998A1 publication Critical patent/WO2005119998A1/fr

Links

Classifications

    • 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
    • H04L25/0204—Channel estimation of multiple channels
    • 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
    • H04L25/0212—Channel estimation of impulse response
    • 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
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals

Definitions

  • the invention relates to a method for the receiver-side estimation of data in a transmission system according to the preamble features of claim 1 and to a device for the receiver-side estimation of data in a radio communication system.
  • JLSCE Java Least Square Channel Estimation
  • PA Ranta A. Hottinen
  • Z.-C. Honkasalo "Co-channel interference cancellation receiver for TDMA mobile systems”
  • the object of the invention is to propose a method or a device for the receiver-side estimation of data in a transmission system, in particular a drive or a device for estimating the training sequence code number and / or for applying a JLSCE for a quasi-synchronous TDMA network.
  • a device for estimating data on the receiver side in a transmission system in particular a radio communication system with an estimation device for estimating the data
  • the estimation device being fed an input sequence of data from data, which are assigned to a channel, and from this superimposed data which are assigned to at least one co-channel to the channel, the superimposed data of different channels being received with a time shift and the channel and different co-channels having different channel coefficients
  • the estimation device is designed to estimate the channel coefficients of at least one co-channel, in particular is designed to carry out a corresponding one of the methods.
  • a method is preferred in which the training sequences have permanently assigned training sequence code numbers and when estimating the training sequence code numbers are additionally or preferably estimated instead of the training sequences.
  • a method is preferred in which received bursts with sequences from data use their midambles for estimating.
  • a method is particularly preferred in which the channel coefficients of a multiplicity, in particular all, of the co-channels are estimated.
  • a method is preferred in which the training sequence is extended by the length of the shift amount as a result of data by adding zeros.
  • signals or data are transmitted via a radio interface in a transmission system, in particular a radio communication system, for example in accordance with the GSM / EDGE standard.
  • a radio communication system for example in accordance with the GSM / EDGE standard.
  • sequences from data yo, yi are sent to different subscriber stations, for example to a first subscriber station MS0 or to a second subscriber station.
  • Transfer station MSI Transfer station MSI.
  • the first subscriber station MSO is regarded as the receiver, in which the sequence of useful data originally sent for this receiver MSO is to be reconstructed as best possible for the receiver as the 5th data.
  • the sequence of data y 0 transmitted from the first base station BSO to the receiver MSO is transmitted over a first channel h 0 .
  • a channel estimation for example a JLSCE, is carried out in the receiver MSO for preferably all possible training sequences TSC X of the J interfering channels h 0 , hi, ..., hj. This leads to hypotheses (h 0 , h ,, ..., h j ). In a subsequent step, it is determined which of these hypotheses best results in a correct assignment of the training sequences.
  • the channel coefficients of the J + 1 co-channels are estimated when there is an unknown time shift between the co-channels, the time shift being able to arise, for example, due to different propagation delays.
  • JLSCE joint-least-squares channel estimation
  • a data sequence y received in the receiver MSO can be described in a complex baseband notation in vector / matrix form after a baud rate sampling:
  • the (L + l) xl channel coefficient vectors are h-, the following being valid for a running index for the interfering data sequence and / or channels: O ⁇ j ⁇ J.
  • the run index j 0 is assigned to the desired channel or the desired data sequence without loss of generality.
  • elements of a (KL) xl noise vector n it is assumed that these are statistically independent and Gaussian distributed with mean equal to zero and a variance ⁇ ".
  • f: hj, h ⁇ , ..., h] j.
  • Formula (5) corresponds to a linear system of equations with K-L equations and (J + 1) (L + 1) unknowns, both of which apply to each quadrature component. Therefore, the performance decreases with increasing L and J for a given K.
  • K 26
  • MSE Mean Squared Error
  • EN 0 is the mean signal-to-noise ratio (SNR: Signal-to-Noise Ratio) per data symbol and tr ⁇ . ⁇ denotes the assigned trace.
  • SNR Signal-to-Noise Ratio
  • tr ⁇ . ⁇ denotes the assigned trace.
  • CCI signal to interference ratio
  • Equation (10) can be simplified
  • Training sequences of a variety of channels which also include transmissions to certain participants, wrote.
  • the large number of these training sequences preferably comprises a desired training sequence of a data sequence which is transmitted to the receiver itself via a desired channel.
  • the training sequences to be estimated preferably include as many training sequences or training sequences or channels and data sequences that interfere with them.
  • the estimation of these training sequence code numbers can preferably also suffice to a sufficient extent, since the actual training sequences can be assigned in this way.
  • an estimation device in particular a maximum likelihood estimator, is proposed for estimating a large number of training sequences or training sequence code numbers.
  • the training sequence of the desired participant or the desired channel is known.
  • all training sequences are different from one another.
  • the euclidean distance to the received sequence is preferably calculated from data y for each of the hypotheses (h o ⁇ j ⁇ - ⁇ h j ) and the best hypothesis is selected: y - A o h o - ⁇ j ⁇ j ji ( 14)
  • the performance difference in comparison with a true JLSCE is for the region of interest of signal-to-noise ratios (Es / N 0 > OdB) negligible. Therefore, the general belief that the training sequences TSC of all interfering channels must be known to the receiver is obviously not correct from a practical application point of view.
  • a synchronous network is understood to mean that all base stations are operated synchronized in time. Due to the random delay in the propagation of the signals on a radio interface, this does not necessarily mean that the signals are running on the direct, straight path Signals from all co-channels arrive at the mobile subscriber stations at the same time. Typically, signals or sequences from data of interfering channels arrive with a delay with respect to signals or sequences from data of the desired subscriber or channel.
  • shift ambiguity means that in the event that the channel coefficients, in particular estimated, are shifted to the left by a number of positions, then the corresponding, In particular, the estimated data sequence or sequence of data is shifted to the right by V j positions, the shifts also being able to be carried out in the opposite manner:
  • the corresponding estimated channel coefficients are automatically shifted to the left by V j positions.
  • the shift can be carried out in the opposite direction. If this principle is applied to all co-channels, then all channel coefficients are aligned and it is therefore sufficient to carry out the originals JLSCE, ie to estimate L + 1 coefficients per co-channel.
  • the MSE performance can be calculated using equation (6).
  • equation (8) is modified slightly to take account of the displacements v ⁇ . Due to the shifts, the training sequences TSC are expanded accordingly by zeros.
  • JMMSE Joint Minimum Mean Square Error Estimation

Landscapes

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

Abstract

L'invention concerne un procédé d'évaluation côté récepteur de données (y0) dans un système de transmission, p. ex. un système de radiocommunication (GSM/EDGE), une série de données (y) introduite présentant des données (y0), associées à un canal (h0), et des données (yj j=1, ..., J) prioritaires sur ces dernières, associées à au moins un co-canal (hj) dudit canal, et différentes séquences d'apprentissage (TSCj) étant associées aux données du canal et du co-canal. Ledit procédé se caractérise en ce que les séquences d'apprentissage du co-canal et, en particulier, du canal sont évaluées lors de l'évaluation. L'invention concerne également un procédé d'évaluation côté récepteur de données (y0) dans un système ionique (GSM/EDGE) selon un mode de réalisation alternatif ou de préférence combiné, une série de données (y) introduite présentant des données (y0), associées à un canal (h0), et des données (yj j=1, ..., J) prioritaires sur ces dernières, associées à au moins un co-canal (hj) dudit canal, les données prioritaires de différents canaux (hj) étant reçues de façon décalée dans le temps et différents coefficients de canal étant associés aux données du canal et des différents co-canaux. Ledit procédé se caractérise en ce que les coefficients de canal d'au moins un co-canal sont évalués.
PCT/EP2005/052499 2004-06-04 2005-06-01 Procede et dispositif d'evaluation cote recepteur de parametres des co-canaux dans un systeme de radiocommunication WO2005119998A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004027288.3 2004-06-04
DE200410027288 DE102004027288A1 (de) 2004-06-04 2004-06-04 Verfahren und Vorrichtung zum empfängerseitigen Schätzen von Daten in einem Übertragungssystem

Publications (1)

Publication Number Publication Date
WO2005119998A1 true WO2005119998A1 (fr) 2005-12-15

Family

ID=34968821

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/052499 WO2005119998A1 (fr) 2004-06-04 2005-06-01 Procede et dispositif d'evaluation cote recepteur de parametres des co-canaux dans un systeme de radiocommunication

Country Status (2)

Country Link
DE (1) DE102004027288A1 (fr)
WO (1) WO2005119998A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002021781A1 (fr) * 2000-09-05 2002-03-14 Infineon Technologies Ag Egalisation de canal amelioree pour recepteur de telephonie mobile
EP1475932A2 (fr) * 2003-05-09 2004-11-10 Texas Instruments Incorporated Detection d'un signal d'interference et estimation du canal pour des reseaux de communication sans fil

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6947502B2 (en) * 2002-04-16 2005-09-20 Taylor Matthew A Parameter estimator for a multiuser detection receiver

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002021781A1 (fr) * 2000-09-05 2002-03-14 Infineon Technologies Ag Egalisation de canal amelioree pour recepteur de telephonie mobile
EP1475932A2 (fr) * 2003-05-09 2004-11-10 Texas Instruments Incorporated Detection d'un signal d'interference et estimation du canal pour des reseaux de communication sans fil

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CHEN X ET AL: "BLIND EQUALIZATION WITH ITERATIVE JOINT CHANNEL AND DATA ESTIMATION FOR WIRELESS DPSK SYSTEMS", GLOBECOM'01. 2001 IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE. SAN ANTONIO, TX, NOV. 25 - 29, 2001, IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE, NEW YORK, NY : IEEE, US, vol. VOL. 1 OF 6, 25 November 2001 (2001-11-25), pages 274 - 279, XP001090260, ISBN: 0-7803-7206-9 *
RANTA P A ET AL: "Chapter 3: Radio Aspects: Interference suppression by joint demodulation of cochannel signals", GSM: EVOLUTION TOWARDS 3RD GENERATION SYSTEMS, KLUWER, DORDRECHT, NL, 1999, pages 1 - 31, XP002331762 *

Also Published As

Publication number Publication date
DE102004027288A1 (de) 2005-12-29

Similar Documents

Publication Publication Date Title
DE60118896T2 (de) Mehrbenutzerdetektion unter verwendung einer adaptiven kombination von gleichzeitiger erfassung und sequentieler interferenzunterdrückung
DE19616829C1 (de) System zur Funkübertragung digitaler Signale zwischen mehreren Teilnehmerstationen und einer Basisstation
DE69935088T2 (de) Iterative Kanalabschätzung
EP0490427B1 (fr) Récepteur ayant au moins deux branches de réception
DE19733336A1 (de) Verfahren und Funkstation zur Datenübertragung
EP1000476B1 (fr) Procede et station radio pour la transmission de donnees
EP1320200B1 (fr) Procédé de transmission de signaux entre une premiere et deuxième station radio et station radio
EP0986882B1 (fr) Procede d'adaptation variant dans le temps et dispositif de reception de donnees
DE60131678T2 (de) Methode zur schätzung der signalqualität
DE102013106413A1 (de) Verfahren und Verarbeitungseinheit zum Verarbeiten eines Datensignals
DE60034043T2 (de) Verfahren und vorrichtung zur kanalschätzung mit sendediversität
DE19923407C1 (de) Empfangsverfahren und Empfangseinrichtung für Mobilfunkanwendungen
DE10141971A1 (de) Adaptive Kanalschätzung in einem OFDM-basierten Mobilfunksystem durch Variation der Anzahl der Pilotsymbole
DE60010553T2 (de) Interferenzunterdrückungsverfahren
EP1004172B1 (fr) Procede et dispositif pour l'estimation de canaux
DE19826036C2 (de) Verfahren zur Trennung von mehreren überlagerten codierten Nutzersignalen
DE19820761C1 (de) Verfahren und Einrichtung zur Kanalschätzung
WO2005119998A1 (fr) Procede et dispositif d'evaluation cote recepteur de parametres des co-canaux dans un systeme de radiocommunication
EP0904640A1 (fr) Procede pour separer un melange de signaux re us
DE60308419T2 (de) Empfänger mit iterativer kanalschätzung unter verwendung einerrückkehrschleife (turboschätzung)
DE60314838T2 (de) Verfahren zum Senden von Daten in einem Telekommunikationssystem
WO1999020011A1 (fr) Procede et station radio pour transmettre des donnees
DE19858724C1 (de) Verfahren zur Kanalschätzung
DE10115583B4 (de) Verfahren und Vorrichtung zur Bildung eines Ähnlichkeitsmaßesund Kanalschätzung mittels Ähnlichkeitsmaß
EP1327342B1 (fr) Estimation de canal effectuee a partir de plusieurs estimations de canal anterieures et servant a un precorrection

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 BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU MC NL PL PT RO SE SI SK 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
NENP Non-entry into the national phase

Ref country code: DE

WWW Wipo information: withdrawn in national office

Country of ref document: DE

122 Ep: pct application non-entry in european phase