Journal ArticleDOI
Channel coding with multilevel/phase signals
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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
I-Q TCM: reliable communication over the Rayleigh fading channel close to the cutoff rate
S.A. Al-Semari,Thomas E. Fuja +1 more
TL;DR: Some trellis codes that provide high coding gain to channels with slow, non frequency-selective Rayleigh fading are presented and it is concluded that an interleaver span of 4/spl nu/ yields performance close to what is achieved with ideal interleaving.
Patent
Multidimensional, convolutionally coded communication systems
TL;DR: In this paper, a family of multi-dimensional convolutionally coded modulation systems achieves enlarged minimum distance between possible sequences of signal points, reduced number of error events with the minimum distance, acceptable peak-to-average power ratio, and immunity to rapid carrier phase changes.
Patent
Near-optimal low-complexity decoding of space-time codes for fixed wireless applications
Titus Lo,Vahid Tarokh +1 more
TL;DR: In this paper, an improved multi-antenna receiver is realized for detecting signals transmitted by a multiantenna transmitter by summing signals received at the plurality of receiver antennas after multiplying each by a respective constant.
Journal ArticleDOI
Multidimensional mapping for bit-interleaved coded modulation with BPSK/QPSK signaling
TL;DR: This paper introduces multidimensional mapping for BICM-ID, where a group of bits is mapped to a vector of symbols, rather than a single symbol, which allows for more flexibility and potential performance improvements.
Journal ArticleDOI
Superposition coded modulation and iterative linear MMSE detection
TL;DR: It is proved that among all possible signaling methods, SCM maximizes the output signal-to-noise/ interference ratio (SNIR) in the LMMSE estimates during iterative detection.
References
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TL;DR: This chapter discusses Coding for Discrete Sources, Techniques for Coding and Decoding, and Source Coding with a Fidelity Criterion.
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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I. M. Jacobs,J. M. Wozencraft +1 more
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Convolutional codes I: Algebraic structure
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.