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
A Simulation Study of Two Bandwidth-Efficient Modulation Techniques
Desmond P. Taylor,Hing Chan +1 more
TL;DR: This paper investigates two signal space coded signaling systems by means of computer simulation with a band-limited, nonlinear channel and both systems exhibit performance improvenment compared to uncoded systems.
Patent
System and method for generating waveforms and utilization thereof
TL;DR: In this paper, a method for transmitting a waveform includes adjusting first multiplexing parameters of a first multi-carrier waveform to meet communications requirements of a communications system.
Proceedings ArticleDOI
Multistage coding and decoding for a M-PSK system
T. Woerz,J. Hagenauer +1 more
TL;DR: In this paper, the maximum likelihood metric for different stages of multistage decoding is derived and the simulation results and bounds for coded 4-PSK (phase shift keying) show a gain over classical coding at the same bit-error rate (BER) and the same coding rate.
Journal ArticleDOI
Spectrum, distance, and receiver complexity of encoded continuous phase modulation
P.K.M. Ho,P.J. McLane +1 more
TL;DR: A comparison of different classes of encoded continuous phase modulation (CPM) schemes is presented, and it is found that coded eight- level systems are better than coded four-level systems and that partial- response signalling is better than full-response signalling.
Journal ArticleDOI
Systematic design of space-time codes employing multiple trellis coded modulation
Xiaotong Lin,Rick S. Blum +1 more
TL;DR: It is illustrated that, if the trellis branches are properly labeled, the overall coding gain can be made larger than that achieved by conventional ST codes with the same transmission rate and the same number of states.
References
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Journal ArticleDOI
The viterbi algorithm
TL;DR: This paper gives a tutorial exposition of the Viterbi algorithm and of how it is implemented and analyzed, and increasing use of the algorithm in a widening variety of areas is foreseen.
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TL;DR: Minimal encoders are shown to be immune to catastrophic error propagation and, in fact, to lead in a certain sense to the shortest decoded error sequences possible per error event.
Journal ArticleDOI
Coherent and Noncoherent Detection CPFSK
W. Osborne,M. Luntz +1 more
TL;DR: This work provides a complete analysis of the performance of CPFSK at high SNR as well as low SNR and thereby unifies and extends the results previously available.