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    METHODS AND APPARATUS FOR REDUCING ERROR FLOORS IN MESSAGE PASSING DECODERS
    3.
    发明公开
    METHODS AND APPARATUS FOR REDUCING ERROR FLOORS IN MESSAGE PASSING DECODERS 有权
    Turbo均衡与软输入 - 软输出信号处理和迭代消息传递解码

    公开(公告)号：EP1696786A2

    公开(公告)日：2006-09-06

    申请号：EP04814978.5

    申请日：2004-12-17

    申请人： Qualcomm Flarion Technologies, Inc.

    发明人： RICHARDSON, Tom

    IPC分类号： A61B1/00

    CPC分类号： H03M13/1128 ,  H03M13/1111 ,  H03M13/2963 ,  H03M13/3723 ,  H03M13/6331 ,  H04L1/0051 ,  H04L1/0057 ,  H04L25/03171

    摘要： An iterative message passing decoder, e.g., an LDPC decoder (404), operating in conjunction with a soft input - soft output signal processing unit (402), e.g., an ISI detector, has an error floor performance region influenced by the decoder’s suboptimal message passing nature. Error floor reduction is achieved by a simple message re-initialization mechanism. Decoder edge states, e.g., constraint to variable node messages in decoder memory, are reinitialized, e.g., for an iteration, during the decoding after soft values provided by signal-processing unit (402) have improved. During the message re-initialization and for some subsequent amount of iterative decoder processing, extrinsic information (416) fed back from the decoder to the signal processing unit (402) and/or soft values delivered to the decoder from the signal processing unit (402), in an outer communications loop, is temporarily frozen, e.g., using a switch and a buffer (410). Then, the outer communications loop is restored as the decoding continues, achieving improved decoding performance.

    METHODS AND APPARATUSES FOR DATA RATE ADAPTATION
    4.
    发明公开
    METHODS AND APPARATUSES FOR DATA RATE ADAPTATION 有权
    方法和设备适应数据速率

    公开(公告)号：EP1856831A1

    公开(公告)日：2007-11-21

    申请号：EP06738103.8

    申请日：2006-03-08

    申请人： QUALCOMM Flarion Technologies, Inc.

    发明人： LAROIA, Rajiv ,  JIN, Huui ,  RICHARDSON, Tom

    IPC分类号： H04L1/00

    CPC分类号： H04L1/0033 ,  H04L1/0003 ,  H04L1/0015 ,  H04L1/0025 ,  H04L1/0026

    摘要： A base station selects and assigns uplink segments to specific wireless terminals. The base station estimates potential system interference levels, selects, assigns, and transmits a maximum uplink rate indicator value to a wireless terminal indicating the maximum uplink dat rate that the wireless terminal is permitted to use. The wireless terminal receives the maximum data rate indicator and selects an uplink data rate to use which is less than or equal to the maximum data rate indicator level. The selection includes consideration of data amounts, data importance, communications channel quality, changes affecting the channel and/or power information. The wireless terminal encodes information indicative of the selected used rate wit the user data/information to be transmitted by placing additional energy on a subset of the uplin signals. The base station receives the uplink signals including user data/information and data rate. The base station extracts the data rate used and utilizes the data rate to demodulate and decode the uplink user data/information.

    METHODS AND APPARATUS FOR IMPLEMENTING AND USING AN IN-BAND RATE INDICATOR
    6.
    发明公开
    METHODS AND APPARATUS FOR IMPLEMENTING AND USING AN IN-BAND RATE INDICATOR 有权
    方法和用于实现，并使用带速率指示装置

    公开(公告)号：EP1908192A2

    公开(公告)日：2008-04-09

    申请号：EP06787643.3

    申请日：2006-07-19

    申请人： Qualcomm Flarion Technologies, Inc.

    发明人： LAROIA, Rajiv ,  JIN, Hui ,  LI, Junyi ,  LANE, Frank, A. ,  RICHARDSON, Tom

    IPC分类号： H04B7/26

    CPC分类号： H04L1/0057 ,  H04L1/0004 ,  H04L1/0005 ,  H04L1/0009 ,  H04L1/0025 ,  H04L1/0029 ,  H04L27/0008 ,  H04L27/2608 ,  Y02D50/10

    摘要： Downlink traffic channel data rate options and methods of indicating to a wireless terminal a utilized downlink data rate option are described. The downlink traffic channel rate option for a segment is conveyed using an assignment signal and/or a block in the downlink traffic channel segment which is not used for user data. Downlink segment assignment signals in some implementations allocate fewer bits for rate option indication than are required to uniquely identify each option. In some implementations low rate options, e.g., using QPSK, are uniquely identified via assignment signals. Higher rate options, e.g., using QAM16 modulation, are conveyed via the distinct information block in the downlink traffic segment using a first coding/modulation method. Still higher rate options, e.g., using QAM16, QAM64, or QAM256, are conveyed via the information block in the segment using a second coding/modulation method which is applied to the rate option information.