发明名称 |
Method and apparatus for MAP decoding of binary hamming codes and related error correction codes |
摘要 |
A method and apparatus are disclosed for MAP decoding of signals encoded using error correction codes to make maximum probability decisions about each transmitted bit. A disclosed MAP decoding algorithm extends the work of Hartman and Rudolph and exploits properties of Hamming error correction codes to provide a decoding algorithm having a complexity that is proportional to n log n for Hamming codes. The invention computes a difference, rho, of the probabilities the that transmitted symbol was zero and one based on characteristics of the channel and then determines the product of the rhol values corresponding to non-zero positions of codewords of the dual code using real vector and F2[<custom-character file="US20040088645A1-20040506-P00900.TIF" wi="20" he="20" id="custom-character-00001"/>2]-vector fast Walsh-Hadamard transforms. The invention also processes all positions of all codewords to determine a sum for each position that indicates the reliability that a received bit is a given value for a given position using the real vector fast Walsh-Hadamard transforms.
|
申请公布号 |
US2004088645(A1) |
申请公布日期 |
2004.05.06 |
申请号 |
US20020285365 |
申请日期 |
2002.10.31 |
申请人 |
ASHKHMIN ALEXEI;LITSYN SIMON |
发明人 |
ASHKHMIN ALEXEI;LITSYN SIMON |
分类号 |
H03M13/39;H03M13/45;(IPC1-7):H03M13/00 |
主分类号 |
H03M13/39 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|