Journal ArticleDOI
A new multilevel coding method using error-correcting codes
Hideki Imai,S. Hirakawa +1 more
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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
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One-way multi-mode transmission using block-coded modulatt ion for mobile communications
Eiji Okamoto,Hiroyo Ogawa +1 more
TL;DR: A method of one-way multi-mode block-coded modulation for mobile communication systems that facilitates an adaptive form of multi- mode transmission and enables a transmitter to operate flexibly, e.g., if the transmitter is moving, it selects a mode with a large MSD to avoid fading.
Proceedings ArticleDOI
Coding for multicarrier digital radio systems
Antoine Chouly,H. Sari +1 more
TL;DR: The authors investigate the performance of systems which combine the techniques of multicarrier transmission and block-coded modulation and found that coding is significantly more effective than in single-carrier systems.
Posted Content
BICM Capacity - Part II: First-Order Optimal Signal Sets and Binary Labelings
Erik Agrell,Alex Alvarado +1 more
TL;DR: It is found that under some mild conditions for the fading, the analysis of FOO constellations can always be reduced to the nonfading case, and that for uniform input distributions, a constellation for BICM is FOO if and only if it is a linear projection of a hypercube.
Proceedings ArticleDOI
C4. Multi Rate Single Code Multi Carrier Superposition Coded Modulation (MR-SC-MC-SCM) for Multi User Communications
TL;DR: The main contribution of this paper is to reduce the transceiver complexity in terms of number of encoders and decoders with minor performance degradation in-terms of Bit Error Rate (BER).
References
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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.
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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.