Mutual-Information-Based Adaptive Bit-Loading Algorithms for LDPC-Coded OFDM

In this paper we analyze the performance of an LDPC-coded OFDM system with adaptive bit-loading based on mutual information. We demonstrate that the mutual information between the transmitted binary sequence and the soft information input to LDPC decoder well characterizes the performance of the LDP...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2007-05, Vol.6 (5), p.1670-1680
Main Authors: Yan Li, Ryan, W.E.
Format: Article
Language:English
Subjects:
Adaptive algorithms
Adaptive systems
Algorithm design and analysis
Algorithms
Allocations
Applied sciences
Binary sequences
Decoders
Decoding
Design engineering
Exact sciences and technology
Information analysis
Modulation
Mutual information
OFDM modulation
Orthogonal Frequency Division Multiplexing
Parity check codes
Performance analysis
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Throughput
Transmission and modulation (techniques and equipments)
Wireless communication
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Description
Summary:In this paper we analyze the performance of an LDPC-coded OFDM system with adaptive bit-loading based on mutual information. We demonstrate that the mutual information between the transmitted binary sequence and the soft information input to LDPC decoder well characterizes the performance of the LDPC-coded system, independent of the modulation type and the number of carriers. We design mutual information-based adaptive bit-loading and power allocation algorithms for LDPC-coded OFDM systems to maximize throughput performance under a packet-error rate constraint. To characterize the performance of the system under study, we derive the achievable information rate and a throughput upper bound for the system
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2007.360369