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    22.
    发明专利
    未知

    公开(公告)号：DE60019091D1

    公开(公告)日：2005-05-04

    申请号：DE60019091

    申请日：2000-05-05

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： LUSCHI CARLO ,  KUZMINSKIY ALEXANDR ,  STRAUCH PAUL EDWARD ,  YAN RAN-HONG

    IPC: H04B1/10 ,  H04B7/005 ,  H04B7/08 ,  H04B7/26 ,  H04L1/06 ,  H04L1/20 ,  H04L25/03

    Abstract: A mobile telephone system includes a base station which establishes a link with a selected mobile station. The received signal from the mobile station will include a noise component as well as a possible interference component from another mobile station operating at the same frequency in another cell. The base station has a trellis based equalisation system which operates on the assumption that the received signal includes components which have a predominantly Gaussian characteristic. A switch controller determines when the interference component (which is non-gaussian) in the received signal becomes a dominant component and operates to switch a spatio-temporal filter into the circuit instead of the trellis based equalisation system, to improve the bit error rate performance.

    ITERATIVE CHANNEL ESTIMATION
    23.
    发明专利
    ITERATIVE CHANNEL ESTIMATION 未知

    公开(公告)号：CA2269925C

    公开(公告)日：2004-02-03

    申请号：CA2269925

    申请日：1999-04-26

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： YAN RAN-HONG ,  LUSCHI CARLO ,  BAR-DAVID ISRAEL

    IPC: H04B7/005 ,  H04B1/10 ,  H04L25/02 ,  H04L1/00 ,  H04L1/20

    Abstract: The invention includes method and apparatus for estimating channel impulse response and data in a signal transmitted over a channel in a communication system. The channel impulse response is estimated and then, using the estimated channel impulse response, the data in the signal is estimated. The output is then fed back to the channel impulse response estimator and the channel impulse estimation is repeated. The data estimation and channel impulse response estimation may be iterated a number of times. The channel impulse response estimating step uses correlative channel sounding.

    Channel estimation using soft-decision feedback
    28.
    发明专利
    Channel estimation using soft-decision feedback 未知

    公开(公告)号：AU722419B2

    公开(公告)日：2000-08-03

    申请号：AU2400899

    申请日：1999-04-27

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： LUSCHI CARLO ,  MUJTABA SYED AON ,  SANDELL MAGNUS ,  STRAUCH PAUL EDWARD ,  YAN RAN-HONG ,  BRINK STEPHAN TEN

    IPC: H04L27/01 ,  H04L25/02 ,  H04B1/10 ,  H04B7/005

    Abstract: A method of estimating channel impulse response in a signal transmitted over a channel in a communication system is described. The channel estimator obtains a priori knowledge about the transmitted signal, and then uses the transmitted signal and the a priori knowledge to choose an estimate of channel impulse response which minimizes the expected distance between the transmitted signal and a reconstructed signal. The expected distance that is minimized is a cost function, represented by E{∥r-Bh∥2r}. By using soft decision feedback, the invention minimizes erroneous decision feedback which can cause error propagation. The decisions are usually in the form of log likelihood ratios (LLR).

    Source controlled channel decoding
    29.
    发明专利
    Source controlled channel decoding 未知

    公开(公告)号：GB2344034A

    公开(公告)日：2000-05-24

    申请号：GB9922345

    申请日：1999-09-21

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： LUSCHI CARLO ,  SANDELL MAGNUS ,  STRAUCH PAUL EDWARD ,  YAN RAN-HONG

    IPC: H03M13/39 ,  H04L1/00 ,  H03M13/00

    Abstract: A method of source controlled channel decoding a bit of a received frame comprises: determining inter-frame a priori information based on correlation between corresponding elements U k-l,n and U k,n of successive frames; determining intra-frame a priori information based on correlation between predetermined elements U k,n and U k,l of each frame; determining the a priori information for the bit by combining the inter-frame and intra-frame a priori information. The step of combining the inter-frame and intra-frame a priori information may comprise adding the inter-frame and intra-frame a priori soft values.

    ACCUMULATIVE ARQ METHOD AND SYSTEM
    30.
    发明专利
    ACCUMULATIVE ARQ METHOD AND SYSTEM 未知

    公开(公告)号：CA2347226A1

    公开(公告)日：2000-04-27

    申请号：CA2347226

    申请日：1999-10-12

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： LUSCHI CARLO ,  SANDELL MAGNUS ,  DEMETRESCU CRISTIAN

    IPC: H04L1/18 ,  H04B7/26 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56

    Abstract: There is disclosed a method of recovering a received packet comprising the steps of: generating a soft value for each bit of the received packet; stori ng the soft values of the received packet; performing an error check on the received packet; and responsive to detection of an error: i) receiving a retransmission of the packet; ii) generating a soft value for each bit of th e retransmitted packet; iii) combining each generated soft value with the respective last stored soft values; iv) storing the combined soft values; v) performing an error check based on the thus combined soft values; and vi) responsive to detection of an error repeating steps i) to v). Circuitry for implementing such a method in a receiver is also disclosed.

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