中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

36 records (took 0.025 seconds)

    22.
    发明专利
    未知

    公开(公告)号：BR0101093A

    公开(公告)日：2001-11-06

    申请号：BR0101093

    申请日：2001-03-19

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： DEMETRESCU CRISTIAN ,  SAMARAS KONSTANTINOS ,  SAMUEL LOUIS GWYN ,  WU JIAN JUN ,  YAN RAN-HONG ,  SANDELL MAGNUS

    IPC: H04L12/28 ,  H04B7/26 ,  H04B14/04 ,  H04L12/56

    Abstract: In the GPRS, a method of decoding uplink status having reduced interleaving depth in a RLC/MAC block is proposed; for RT-EGPRS users, all of the uplink flag bits are provided in the first burst of the four bursts; and for EGPRS users, nine bits of the uplink status flags are provided in the first burst of the RLC/MAC block and the remaining bits in the next three bursts. On receiving the first nine bits, a mobile performs an autocorrelation to identify the USF whether it belongs to the EGPRS or to the RT-EGPRS group.

    Iterative (turbo) equalisation
    23.
    发明专利
    Iterative (turbo) equalisation 未知

    公开(公告)号：GB2354676A

    公开(公告)日：2001-03-28

    申请号：GB9922244

    申请日：1999-09-20

    Applicant: LUCENT TECHNOLOGIES INC

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

    IPC: H03M13/29 ,  H04L1/00 ,  H04L25/03 ,  H03M13/00 ,  H03M13/27

    Abstract: There is disclosed a method of recovering a received signal comprising the steps of: equalising (100) the received signal, channel decoding (102) the equalised received signal, wherein a priori information of the received signal is utilised in the equalisation step. The equalising step may be performed in a sub-optimum equaliser. The channel decoding step may be performed in an a posterior channel decoder. The a priori information is obtained by subtracting (110) the output of the a posterior decoder (102) from the output of the deinterleaver (104).

    Accumulative ARQ method and system
    24.
    发明专利
    Accumulative ARQ method and system 未知

    公开(公告)号：AU2255000A

    公开(公告)日：2000-05-08

    申请号：AU2255000

    申请日：1999-10-12

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： DEMETRESCU CRISTIAN ,  LUSCHI CARLO ,  SANDELL MAGNUS

    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; storing 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 the 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
    25.
    发明专利
    Channel estimation using soft-decision feedback 未知

    公开(公告)号：AU2400899A

    公开(公告)日：1999-11-11

    申请号：AU2400899

    申请日：1999-04-27

    Applicant: LUCENT TECHNOLOGIES INC

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

    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).

    29.
    发明专利
    未知

    公开(公告)号：DE69932118D1

    公开(公告)日：2006-08-10

    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).

Patent Agency Ranking