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Efficient demultiplexing algorithm for noncontiguous carriersA channel separation algorithm for the frequency division multiple access/time division multiplexing (FDMA/TDM) scheme is presented. It is shown that implementation using this algorithm can be more effective than the fast Fourier transform (FFT) algorithm when only a small number of carriers need to be selected from many, such as satellite Earth terminals. The algorithm is based on polyphase filtering followed by application of a generalized Walsh-Hadamard transform (GWHT). Comparison of the transform technique used in this algorithm with discrete Fourier transform (DFT) and FFT is given. Estimates of the computational rates and power requirements to implement this system are also given.
Document ID
19930048564
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Thanawala, A. A.
(NASA Lewis Research Center Cleveland, OH, United States)
Kwatra, S. C.
(NASA Lewis Research Center Cleveland, OH, United States)
Jamali, M. M.
(Toledo Univ. OH, United States)
Budinger, J.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 16, 2013
Publication Date
August 1, 1992
Publication Information
Publication: Journal of Spacecraft and Rockets
Volume: 29
Issue: 4
ISSN: 0022-4650
Subject Category
Communications And Radar
Accession Number
93A32561
Funding Number(s)
CONTRACT_GRANT: NAG3-799
Distribution Limits
Public
Copyright
Other

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