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
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Journal ArticleDOI
Combination of BCM and TCM with 90/spl deg/, 180/spl deg/, and 270/spl deg/ phase rotational invariance
Szn-Lin Su,Jau-Ming Wu +1 more
TL;DR: Two systematic schemes to combine block- coded modulation (BCM) and trellis-coded modulation (TCM) are proposed and the phase ambiguity problems for both schemes are considered and solved by a differential encoder/decoder.
Proceedings ArticleDOI
Low-complexity Channel-polarized Multilevel Coding for Probabilistic Amplitude Shaping
TL;DR: A low-complexity FEC scheme for PAS is proposed, which applies SD-FEC to unreliable bits converted by channel polarization, which reduces the complexity by up to 83% compared with changing the decoding iterations in PAS.
Dissertation
Energy-efficient LTE transmission techniques : introducing Green Radio from resource allocation perspective
TL;DR: Energy-efficient resource allocation strategies have been investigated taking the LTE system as an example, and an antenna selection criterion is proposed, indicating the most energy-efficient antenna configuration with the knowledge of users’ locations and quality of service requirements.
Proceedings ArticleDOI
Performance of convolutional codes under a new distance metric in Rayleigh fading channel
TL;DR: A new distance metric for MLC/PDL (multilevel codes/parallel decoding of levels) with MQAM constellation is proved to be applicable when punctured convolutional code is used as component code of Rayleigh fading channel.
Journal ArticleDOI
Systolic architecture for the VLSI implementation of high-speed staged decoders/quantizers
TL;DR: This work describes the systolic-array implementation of a block-oriented algorithm known as staged decoding, applicable to a class of signal-space codes and lattices obtained through “generalized concatenation”, and derives a very efficient symbol-level pipelined architecture of the staged processor.
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.
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.