Reduced complexity maximum likelihood multiple symbol differenti

Details Reduced complexity maximum likelihood multiple symbol differenti Reduced complexity maximum likelihood multiple symbol differenti

1996-12-27

1998-07-28

Grimm, Siegfried H.

Demodulators

Phase shift keying or quadrature amplitude demodulator

329310, 375283, 375330, 375324, H04L 27233

Patent

active

057867259

ABSTRACT:
A reduced complexity maximum likelihood multiple symbol differential detector which utilizes a maximum likelihood sequence estimation of the transmitted phase and does so by expanding the observation window to observe the received symbol over N signal intervals and making a simultaneous decision on N-1 symbols. The phase of the received signal is calculated up front and thus the detector requires only real subtractions and real additions as opposed to complex multiplications and additions. Furthermore, the detector does not sacrifice performance over conventional prior art detectors.

REFERENCES:
patent: 5550506 (1996-08-01), Tsumura
D. Divsalar and M.K. Simon, "Multiple-Symbol Differential Detection of MPSK," IEEE Trans. on Comm., vol. 38, No. 3, Mar. 1990, pp. 300-308.
C.C. Powell and J. Boccuzzi, "Performance of .pi./4-OPSK Baseband Differential Detection Under Frequency Offset Conditions," IEEE Globecom 1991, pp. 526-530.

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