Journal ArticleDOI
Symbol-aided plus decision-directed reception for PSK/TCM modulation on shadowed mobile satellite fading channels
G.T. Irvine,Peter J. McLane +1 more
TLDR
A system employing SADD phase estimation, trellis-coded modulation, interleaving, and amplitude weighting within the Viterbi decoder yielded the best BER performance on the shadowed MSAT channel considered.Abstract:
The symbol-aided (SA) synchronization concept developed by Moher and Lodge (1989) is applied to the MSAT channel modeled with a shadowed Rician process. Simulation data demonstrate that it can track the severe phase jitter encountered on the fading channel free of the false lock which plagues conventional techniques. The algorithm multiplexes known symbols into the data stream, establishing an absolute reference free of decision errors that is used to estimate the fading phase. An improvement to the SA algorithm which extracts phase information from the data-bearing symbols is proposed. It is found that the new technique is more effective for larger K. The improved algorithm is referred to as symbol-aided plus decision-directed (SADD) phase estimation. A system employing SADD phase estimation, trellis-coded modulation, interleaving, and amplitude weighting within the Viterbi decoder yielded the best BER performance on the shadowed MSAT channel considered. >read more
Citations
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Proceedings Article
Wireless communications
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Journal ArticleDOI
Adaptive joint detection and decoding in flat-fading channels via mixture Kalman filtering
Rong Chen,Xiaodong Wang,J.S. Liu +2 more
TL;DR: A novel adaptive Bayesian receiver for signal detection and decoding in fading channels with known channel statistics is developed, based on the sequential Monte Carlo methodology, and is ideally suited for high-speed parallel implementation using the very large scale integration (VLSI) systolic array technology.
Patent
Method and apparatus for coherent communication reception in a spread-spectrum communication system
TL;DR: In this article, a received reference symbol coded spread-spectrum communication signal is despread with a spreading code to derive a stream of reference samples (152) and stream of data samples (158) and an offset frequency detector (443) determines an offset to be applied to the received signal via a frequency locked loop.
Patent
Method and apparatus for coherent communication in a spread-spectrum communication system
TL;DR: In this paper, a method and apparatus for encoding and decoding to facilitate coherent communication is provided, in which reference symbols are inserted into a stream of input data symbols to form a reference coded stream of data symbols.
References
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Journal ArticleDOI
Channel coding with multilevel/phase signals
TL;DR: A coding technique is described which improves error performance of synchronous data links without sacrificing data rate or requiring more bandwidth by channel coding with expanded sets of multilevel/phase signals in a manner which increases free Euclidean distance.
Journal ArticleDOI
The design of trellis coded MPSK for fading channels: performance criteria
Dariush Divsalar,Marvin K. Simon +1 more
TL;DR: The definition of a new distance measure of optimization of trellis codes transmitted over Rician fading channels, guided by maximizing d/sub free, is proposed.
Journal ArticleDOI
Bandwidth efficient coding for fading channels: code construction and performance analysis
C. Schlegel,Daniel J. Costello +1 more
TL;DR: The authors apply a general method of bounding the event error probability of TCM (trellis-coded modulation) schemes to fading channels and use the effective length and the minimum-squared-product distance to replace theminimum-free-squaring-Euclidean distance as code design parameters for Rayleigh and Rician fading channels with a substantial multipath component.
Journal ArticleDOI
TCMP-a modulation and coding strategy for Rician fading channels
M.L. Moher,J.H. Lodge +1 more
TL;DR: TCMP is a novel modulation strategy for Rician fading channels that multiplexes a time domain pilot sequence with trellis-coded data to permit coherent detection and is shown to provide remarkably robust performance in the presence of fading.
Journal ArticleDOI
The design of trellis coded MPSK for fading channels: set partitioning for optimum code design
Dariush Divsalar,Marvin K. Simon +1 more
TL;DR: It is demonstrated that allowing for multiple symbols per trellis branch provides an additional degree of freedom for designing a code to meet the optimization on the fading channel.