On forward-adaptive versus forward/backward-adaptive SISO algorithms for Rayleigh fading channels

Two types of soft-input soft-output (SISO) algorithms have previously been proposed for iterative decoding of concatenated codes applied over fading channels; forward-adaptive algorithms exploit the dependency between the present symbol interval and past symbol intervals, while forward/backward-adap...

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Bibliographic Details
Published in:IEEE communications letters Vol. 5; no. 12; pp. 477 - 479
Main Authors: Hansson, A., Chugg, K.M., Aulin, T.
Format: Journal Article
Language:English
Published: New York IEEE 01.12.2001
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Additive noise
Additive white noise
Algorithms
AWGN
Channels
Concatenated codes
Decoding
Fading
Frequency
Gaussian noise
Intervals
Iterative algorithms
Iterative decoding
Phase modulation
Rayleigh channels
Symbols
ISSN:1089-7798, 1558-2558
Online Access:Get full text
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Summary:Two types of soft-input soft-output (SISO) algorithms have previously been proposed for iterative decoding of concatenated codes applied over fading channels; forward-adaptive algorithms exploit the dependency between the present symbol interval and past symbol intervals, while forward/backward-adaptive algorithms take both the past and the future into account. Numerical results presented for interleaved serially concatenated continuous phase modulation (CPM) over the Rayleigh fading channel indicate that the performance of forward-adaptive algorithms approaches the performance of forward/backward-adaptive algorithms when a long channel-memory depth is exploited.
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ISSN:1089-7798
1558-2558
DOI:10.1109/4234.974491