Journal ArticleDOI
A new multilevel coding method using error-correcting codes
Hideki Imai,S. Hirakawa +1 more
Reads0
Chats0
TLDR
A new multilevel coding method that uses several error-correcting codes that makes effective use of soft-decisions to improve the performance of decoding and is superior to other multileVEL coding systems.Abstract:
A new multilevel coding method that uses several error-correcting codes is proposed. The transmission symbols are constructed by combining symbols of codewords of these codes. Usually, these codes are binary error-correcting codes and have different error-correcting capabilities. For various channels, efficient systems can be obtained by choosing these codes appropriately. Encoding and decoding procedures for this method are relatively simple compared with those of other multilevel coding methods. In addition, this method makes effective use of soft-decisions to improve the performance of decoding. The decoding error probability is analyzed for multiphase modulation, and numerical comparisons to other multilevel coding systems are made. When equally complex systems are compared, the new system is superior to other multilevel coding systems.read more
Citations
More filters
Journal ArticleDOI
Coded modulation using superimposed binary codes
TL;DR: This correspondence investigates in a comprehensive fashion a one-layer coding/shaping scheme resembling a perfectly cooperated multiple-access system and proposes an optimal soft-input-soft-output (SISO) demapping algorithm with quadratic rather than exponential complexity.
Journal ArticleDOI
A pixelated MIMO wireless optical communication system
TL;DR: This paper introduces the pixelated wireless optical channel, which transmits data at high rates using a series of coded time-varying images to exploit the inherent spatial degrees of freedom and to realize significant gains in spectral efficiency over single-element systems.
Journal ArticleDOI
Optimum mode-switching-assisted constant-power single- and multicarrier adaptive modulation
Byoung-Jo Choi,Lajos Hanzo +1 more
TL;DR: Adaptive modulation constitutes a lower complexity alternative to multiple-transmitter and receiver-based systems when considering the range of techniques that can be used for mitigating the effects of the channel-quality fluctuations imposed by wireless channels.
Patent
System and method for multiplexing a spread spectrum communication system
TL;DR: In this article, a method and system for synchronous transmission and reception of multiplexed digital signals such as spread spectrum is provided. But the method is not suitable for wideband systems.
Journal ArticleDOI
An algorithm for computing the distance spectrum of trellis codes
M. Rouanne,Daniel J. Costello +1 more
TL;DR: An algorithm to compute the distance spectrum of linear, regular, and quasiregular trellis codes is presented, derived from a bidirectional stack algorithm, although it could also be based on the Viterbi algorithm.
References
More filters
Journal ArticleDOI
Convolutional Codes and Their Performance in Communication Systems
TL;DR: This tutorial paper begins with an elementary presentation of the fundamental properties and structure of convolutional codes and proceeds with the development of the maximum likelihood decoder, which yields for arbitrary codes both the distance properties and upper bounds on the bit error probability.
Journal ArticleDOI
Short convolutional codes with maximal free distance for rates 1/2, 1/3, and 1/4 (Corresp.)
TL;DR: In this paper, the authors gave a tabulation of binary convolutional codes with maximum free distance for rates of 1/2, 1/3, and 1/4 for all constraint lengths up to and including nu = 14.
Journal ArticleDOI
Short binary convolutional codes with maximal free distance for rates 2/3 and 3/4 (Corresp.)
TL;DR: In this paper, a search procedure was developed to find good short binary (N,N - 1) convolutional codes using simple rules to discard from the complete ensemble of codes a large fraction whose free distance d{free} either cannot achieve the maximum value or is equal to d_{free} of some code in the remaining set.
Journal ArticleDOI
Correction of errors in multilevel Gray coded data
TL;DR: Certain classes of low-rate binary codes that have simple decoding algorithms can be used as underlying codes in the construction of high-rate easily decodable i -compressed codes, which have higher rates than binary codes of comparable length and number of correctable errors.