NDLI: Pilot-assisted technique on LDPC-coded COFDM-CDMA in frequency-selective multipath fading channels

Content Provider	IEEE Xplore Digital Library
Author	Tae-Yoon Park Young-Shin Ahn Ung Heo Im-Bin Lim Jae-Ho Choi
Copyright Year	2003
Description	Author affiliation: Dept. of Comput. Eng., Chonbuk Nat. Univ., Chonju, South Korea (Tae-Yoon Park; Young-Shin Ahn; Ung Heo; Im-Bin Lim; Jae-Ho Choi)
Abstract	The low-density parity-check code is known for a superior signal reception capability in AWGN and/or flat fading channels with respect to increased encoding rates, however, its performance degrades when the communication channel becomes multipath fading. In this paper we have investigated a novel approach applying a pilot-assisted LDPC coding to a coded OFDM-CDMA system, which operates in a multipath fading mobile channel. In a typical multipath fading mobile channel with a SNR of 16 dB or lower, however, it is a challenging problem to obtain a BER lower than 1 out of I0/sup 5/ when the LDPC encoding rate is about 1/4. In order to enhance the performance of the proposed system we have improve the LDPC decoding algorithm by incorporating the pilot information with the parity check bit. In contrast to the conventional 1/4-rate LDPC coded transmission symbol that is consisted of data bits and parity-check bits in 1 to 3 proportion, in the proposed method the same rate LDPC transmission symbol contains data bits, parity-check bits, and pilot bits in 1 to 2 to 1 proportion, respectively. The included pilot bits are effective not only for channel estimation and equalization but for LDPC symbol decoding by assisting the parity-check bits. The proposed system performance has been verified using computer simulations in multipath, Rayleigh fading channels, and the results show us usefulness of the proposed method over the conventional LDPC coding methods in terms of SNR vs BER measurements.
Sponsorship	Telekon Malaysia Berhad
Starting Page	393
Ending Page	397
File Size	275312
Page Count	5
File Format	PDF
ISBN	0780381149
DOI	10.1109/APCC.2003.1274382
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-09-21
Publisher Place	Malaysia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency Fading Parity check codes AWGN Bit error rate Decoding Degradation Communication channels Channel estimation System performance
Content Type	Text
Resource Type	Article

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Performance of LDPC Coded AOFDM Under Frequency-Selective Fading Channel

Construction algebraic geometric LDPC codes on frequency-selective fading channels

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Analysis and design of LDPC codes for time-selective complex-fading channels

Performance Analysis of LDPC Codes on Different Channels

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Pilot-assisted technique on LDPC-coded COFDM-CDMA in frequency-selective multipath fading channels

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