Multiple symbol differential detection

Details Multiple symbol differential detection Multiple symbol differential detection

1990-07-31

1991-05-21

Grimm, Siegfried H.

Demodulators

Phase shift keying or quadrature amplitude demodulator

375 53, 375 56, 375 85, 375 86, H04L 2722

Patent

active

050178830

ABSTRACT:
A differential detection technique for MPSL signals is provided which uses a multiple symbol observation interval on the basis of which a joint decision is made regarding the phase of the received symbols. In accordance with the invention, a first difference phase is created between first and second received symbols. Next the first difference phase is correlated with the possible values thereof to provide a first plurality of intermediate output signals. A second difference phase is next created between second and third received symbols. The second difference phase is correlated with plural possible values thereof to provide a second plurality of intermediate output signals. Next, a third difference phase is created between the first and third symbols. The third difference phase is correlated with plural possible values thereof to provide a third plurality of intermediate output signals. Each of the first plurality of intermediate outputs are combined with each of the second plurality of intermediate outputs and each of the third plurality of intermediate outputs to provide a plurality of possible output values. Finally, a joint decision is made by choosing from the plurality of possible output values the value which represents the best combined correlation of the first, second and third difference values with the possible values thereof.

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Abstract-IEEE Global Telecommunication Conference & Exhibition, Communication for the Information Age Conference Record Adaptive Direct-Sequence Spread-Spectrum Receiver for Operation in Fading Channels with Narrowband Interferences, Conference Location: Hollywood, Fla., Date: 1988 Nov. 28-Dec. 1, Published by IEEE, New York, 1988.

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