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Multiple symbol differential detectionA differential detection technique for multiple phase shift keying (MPSK) 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.
Document ID
19910018125
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Divsalar, Dariush (California Inst. of Tech. Pasadena., United States)
Simon, Marvin K. (Jet Propulsion Lab. California Inst. of Tech., Pasadena., United States)
Date Acquired
August 14, 2013
Publication Date
May 21, 1991
Subject Category
Communications And Radar
Accession Number
91N27439
Funding Number(s)
CONTRACT_GRANT: NAS7-918
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-5,017,883|NASA-CASE-NPO-17896-1-CU
Patent Application
US-PATENT-APPL-SN-560691

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