Apparatus and method for demodulating signal

Details Apparatus and method for demodulating signal Apparatus and method for demodulating signal

2008-01-08

2008-01-08

Payne, David C. (Department: 2611)

Pulse or digital communications

Receivers

C375S341000

Reexamination Certificate

active

07317766

ABSTRACT:
An apparatus for and a method of signal demodulation which reduces a number of calculations required for demodulating an M-bit codeword which has been modulated from an N-bit codeword. Probability data for each bit of the M-bit codeword is tested to determine if the probability data indicates a high reliability of being either a one or a zero. Bits having the high reliability are compared with corresponding bits in each of a plurality of reference codewords and the codewords having bits which match the corresponding bits having the high reliability are used along with the probability data to calculate a probability of each bit of the N-bit codeword. As a number of bits having the high reliability increases, a number of calculations required to calculate the probability of each bit of the N-bit codeword decreases.

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Patrick Robertson et al., “A Comparison of Optimal and Sub-Optimal MAP Decoding Algorithms Operating in the Log Domain”, Jun. 18, 1995, p. 1009-1013.

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