The TAR decoder-a bandpass Viterbi/FFT decoder for convolutional encoded spread-spectrum signals

A new form of bandpass convolutional decoder termed the TAR decoder is presented. The decoder has as its basis the classic Viterbi algorithm, but uses a fast Fourier transform (FFT) in order to cope with a frequency offset, phase rotating, received signal. The TAR decoder also uses a two-dimensional...

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Bibliographic Details
Published in:IEEE transactions on communications Vol. 44; no. 11; pp. 1392 - 1398
Main Authors: Tomlinson, M., Abu-Rgheff, M.N.A.
Format: Journal Article
Language:English
Published: IEEE 01.11.1996
Subjects:
Convolution
Convolutional codes
Decoding
Fast Fourier transforms
Frequency
History
Modems
Multiaccess communication
Two dimensional displays
Viterbi algorithm
ISSN:0090-6778
Online Access:Get full text
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Summary:A new form of bandpass convolutional decoder termed the TAR decoder is presented. The decoder has as its basis the classic Viterbi algorithm, but uses a fast Fourier transform (FFT) in order to cope with a frequency offset, phase rotating, received signal. The TAR decoder also uses a two-dimensional (2-D) despread signal history array in addition to the usual path history registers. The advantage of the TAR decoder is that the decoder does not need to be preceded by a modem and is not subject to the problems of cycle slips. It can operate at negative input signal-to-noise ratio (SNR) values and is well suited to the decoding of low rate convolutional codes as may be used in code-division multiple-access (CDMA) systems. Symbol timing recovery is still required but this is straightforward in practical cases down to /spl sime/-15 dB SNR.
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ISSN:0090-6778
DOI:10.1109/26.544452