Method for bit detection at the receiver end of differentially c

Details Method for bit detection at the receiver end of differentially c Method for bit detection at the receiver end of differentially c

1991-08-06

1993-05-04

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

329304, H04L 2722

Patent

active

052088367

ABSTRACT:
In a method for bit detection at the receiver end of differentially coded binary or quaternary PSK signals in differential-coherent demodulation, first received, processed signals (Y.sub.n) are supplied parallel to L symbol detectors (S1 to SL) of the order j (j=1,2,3, . . . , L; (L>1)). Then the conjugate complex signals (Y*.sub.n-1, Y*.sub.n-2, . . . Y*.sub.n-L), which are delayed by j symbol periods, and the unchanged, processed input signals (Y.sub.n) are multiplied in multiplication elements (M) to non-quantized output values z.sub.n.sup.(j) of the L symbol detectors and are subsequently complex conjugated. Thereafter, already detected, regenerated PSK symbols (a.sub.n-1, a.sub.n-2, . . . a.sub.n-L+1), delayed by time delay elements (T), are correspondingly fed back, and from this a symbol (a.sub.n) is determined, for which the sum of the squared distances .vertline.z.sub.n.sup.(j) -.epsilon.a.sub.n a.sub.n-1 a.sub.n-2. . . a.sub.n-j+1 .vertline..sup.2 with j=2,3, . . . L) of the L symbol detectors assumes a minimum.

REFERENCES:
patent: 3794921 (1974-02-01), Unkauf
patent: 4603393 (1986-07-01), Laurent et al.
patent: 4608540 (1986-08-01), Tsuchiya et al.
patent: 4715047 (1987-12-01), Hambley
patent: 4879728 (1989-11-01), Tarallo
IEEE Transactions on Information Theory, vol. 34, No. 6, Nov. 1988, pp. 1491-1500.

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