Journal ArticleDOI
Channel coding with multilevel/phase signals
TLDR
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.Abstract:
A coding technique is described which improves error performance of synchronous data links without sacrificing data rate or requiring more bandwidth. This is achieved by channel coding with expanded sets of multilevel/phase signals in a manner which increases free Euclidean distance. Soft maximum--likelihood (ML) decoding using the Viterbi algorithm is assumed. Following a discussion of channel capacity, simple hand-designed trellis codes are presented for 8 phase-shift keying (PSK) and 16 quadrature amplitude-shift keying (QASK) modulation. These simple codes achieve coding gains in the order of 3-4 dB. It is then shown that the codes can be interpreted as binary convolutional codes with a mapping of coded bits into channel signals, which we call "mapping by set partitioning." Based on a new distance measure between binary code sequences which efficiently lower-bounds the Euclidean distance between the corresponding channel signal sequences, a search procedure for more powerful codes is developed. Codes with coding gains up to 6 dB are obtained for a variety of multilevel/phase modulation schemes. Simulation results are presented and an example of carrier-phase tracking is discussed.read more
Citations
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Journal ArticleDOI
Approximation to the symmetric capacity of Rayleigh fading channels with multi-level signals
TL;DR: This approximation is quite tight over all SNR ranges and can be considered as a good alternative for estimating the symmetric channel capacity for both AWGN and Rayleigh fading channels.
Patent
Programmable signal decoder
TL;DR: In this paper, a generic four-level decoder structure includes two levels that are programmable Viterbi decoders, one level that is a Wagner decoder and another level that provides free bit selection operations.
Journal ArticleDOI
Burst-by-burst adaptive decision feedback equalized TCM, TTCM, and BICM for H.263-assisted wireless video telephony
TL;DR: The adaptive TTCM scheme was found to provide the best video performance, although at the cost of the highest complexity in the CDMA-based universal mobile telecommunications systems terrestrial radio access (UTRA) scenario and the good performance of adaptive TTCm scheme recorded when communicating over the COST 207 channels was retained in the UTRA environment.
Journal ArticleDOI
Some block- and trellis-coded modulations for the Rayleigh fading channel
Dojun Rhee,S. Rajpal,Shu Lin +2 more
TL;DR: This paper is concerned with the construction of block and trellis MPSK modulation codes for the Rayleigh fading channel and the distance parameters are chosen to achieve good error performance with reduced decoding complexity.
References
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Journal ArticleDOI
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Journal ArticleDOI
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