Method of digital demodulation

Details Method of digital demodulation Method of digital demodulation

H - Electricity

04

L

H04L 27/22 (2006.01) H04B 7/02 (2006.01) H04L 1/00 (2006.01) H04L 1/04 (2006.01) H04L 1/06 (2006.01)

Patent

CA 2211246

A receiving device performs N separate demodulations (N>=2) each supplying respective estimates of successive binary symbols resulting from differential coding of a sequence of bits sent by a transmitting device, the said differential coding being of the form a k=c k ~ a f(k) where ax and c k designate the binary symbol at position k and the bit at position k, f(k) designates an integer equal to k-1 at most and ~ designates the exclusive-OR operation. Each estimate of a binary symbol at position k is a real number s~ (1<=-i<=N) the sign of which represents the most probable value of the said symbol and the modulus of which measures the likelihood of the said most probable value. The value of a bit at position k of the sequence is estimated on the basis of the number: (see figure I)

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