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    Channel estimation using soft-decision feedback
    11.
    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
    12.
    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
    13.
    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.

    CHANNEL ESTIMATION USING SOFT-DECISION FEEDBACK
    15.
    发明专利
    CHANNEL ESTIMATION USING SOFT-DECISION FEEDBACK 未知

    公开(公告)号：CA2269580A1

    公开(公告)日：1999-10-30

    申请号：CA2269580

    申请日：1999-04-20

    Applicant: LUCENT TECHNOLOGIES INC

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

    IPC: H04L27/01 ,  H04L25/02 ,  H04L1/20 ,  H04Q7/34

    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 use the transmitted signal and the a priori knowledge to choose an estimate of channel impulse response which minimises the expected distance between the transmitted signal and a reconstructed signal. The expected distance that is minimised is a cost function; represented by E{¦¦r-Bh¦¦2r).. By using soft decision feedback, the invention minimises erroneous decision feedback which can cause error propagation. The decision are usually in the form of log likelihood ratios (LLR).

    19.
    发明专利
    未知

    公开(公告)号：DE69932118T2

    公开(公告)日：2006-11-30

    申请号：DE69932118

    申请日：1999-04-27

    Applicant: LUCENT TECHNOLOGIES INC

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

    IPC: H04L25/02 ,  H04L27/01

    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).

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