发明名称 |
Soft-decision syndrome-based decoder for convolutional codes |
摘要 |
A soft-decision decoder computes a maximum likelihood estimated transmitted code from a demodulated received signal with less complexity compared to a conventional Viterbi soft-decision decoder. A symbol-by-symbol detector determines a hard-decision vector from a demodulated received signal vector. A syndrome calculator multiplies the hard-decision vector by a scalar parity check matrix to calculate a syndrome vector. A syndrome modifier examines the syndrome vector for predetermined syndrome patterns corresponding to isolated errors in the hard-decision vector. Syndrome patterns are removed from the syndrome vector to create a modified syndrome vector, and the corresponding error in the hard-decision vector is recorded in an estimated error vector. A syndrome-based decoder uses the modified syndrome vector to create a simplified error trellis to produce a remaining error vector. Subtracting the estimated error vector and the remaining error vector from the hard-decision vector creates a maximum likelihood estimated transmitted code vector.
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申请公布号 |
US6009552(A) |
申请公布日期 |
1999.12.28 |
申请号 |
US19970877845 |
申请日期 |
1997.06.18 |
申请人 |
MOTOROLA, INC. |
发明人 |
ARIEL, MEIR;MEIDAN, REUVEN |
分类号 |
G06F11/10;H03M13/15;H03M13/23;H03M13/45;H04L1/00;(IPC1-7):G01R31/28 |
主分类号 |
G06F11/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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