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    • 4. 发明公开
    • Method and apparatus for map detection with reduced complexity
    • 降低复杂度的地图检测方法和装置
    • EP2083520A2
    • 2009-07-29
    • EP09151154.3
    • 2009-01-22
    • Agere Systems, Inc.
    • Fitzpatrick, Kelly K.Haratsch, Erich F.
    • H03M13/39H04L1/00
    • G11B5/09H03M13/3905H03M13/395H03M13/6343H03M13/6502H04L1/0055H04L1/0066
    • Methods and apparatus are provided for high-speed, low-power, high-performance channel detection. A soft output channel detector is provided that operates at a rate of 1/N and detects N bits per 1/N-rate clock cycle. The channel detector comprises a plurality, D, of MAP detectors operating in parallel, wherein each of the MAP detectors generates N/D log-likelihood ratio values per 1/N-rate clock cycle and wherein at least one of the plurality of MAP detectors constrains each of the bits. The log-likelihood ratio values can be merged to form an output sequence. A single MAP detector is also provided that comprises a forward detector for calculating forward state metrics; a backward detector for calculating backward state metrics; and a current branch detector for calculating a current branch metric, wherein at least two of the forward detector, the backward detector and the current branch detector employ different trellis structures.
    • 提供了用于高速,低功率,高性能信道检测的方法和装置。 提供一个软输出通道检测器,以1 / N的速率工作,并检测每个1 / N速率时钟周期的N位。 信道检测器包括并行操作的多个MAP检测器,其中每个MAP检测器每个1 / N速率时钟周期产生N / D对数似然比值,并且其中多个MAP检测器中的至少一个 约束每个比特。 对数似然比值可以合并以形成输出序列。 还提供单个MAP检测器,其包括用于计算正向状态度量的正向检测器; 用于计算反向状态量度的后向检测器; 以及电流分支检测器,用于计算电流分支量度,其中正向检测器,反向检测器和当前分支检测器中的至少两个采用不同的格子结构。