Adaptive Modulation and Coding Schemes Based on LDPC Codes with Irregular Modulation

In this paper we propose an adaptive modulation and coding (AMC) scheme which uses only a single low-density parity-check (LDPC) encoder/decoder with irregular modulation. Two Gray-mapped quadrature-amplitude modulations are employed within a codeword so that the transmission rates of the proposed A...

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Bibliographic Details
Published in:IEEE transactions on communications Vol. 58; no. 9; pp. 2465 - 2470
Main Authors: Ahn, Seok-Ki, Yang, Kyeongcheol
Format: Journal Article
Language:English
Published: New York, NY IEEE 01.09.2010
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Adaptive modulation and coding (AMC)
Applied sciences
Coders
Coding
Coding, codes
Constellation diagram
Decoders
Encoders
Encoding
Exact sciences and technology
Information, signal and communications theory
irregular modulation
low-density parity-check (LDPC) codes
Mapping
Modulation
Modulation, demodulation
Parity check codes
Reliability
Signal and communications theory
Signal to noise ratio
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Performance evaluation
Quadrature amplitude modulation
Mapping
Overmodulation
Adaptive coding
Codec
low-density parity-check (LDPC) codes
Numerical simulation
Adaptive modulation and coding (AMC)
Error correcting code
Parity check codes
Transmission rate
Adaptive modulation
irregular modulation
Modulation coding
Parity check
ISSN:0090-6778, 1558-0857
Online Access:Get full text
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Description
Summary:In this paper we propose an adaptive modulation and coding (AMC) scheme which uses only a single low-density parity-check (LDPC) encoder/decoder with irregular modulation. Two Gray-mapped quadrature-amplitude modulations are employed within a codeword so that the transmission rates of the proposed AMC can be controlled even though the rate of the employed LDPC code is fixed. The rate and degree distribution of the employed LDPC code are selected properly for the proposed scheme. We also optimize the bit-to-symbol mapping for the LDPC code over irregular modulation at each transmission rate. The performance of the proposed scheme is compared with that of the AMC scheme with a dedicated LDPC code at each transmission rate. Numerical results show that the proposed scheme has a performance comparable to that of the AMC scheme with dedicated LDPC codes.
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ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2010.080310.090176