Low-Density Parity-Check (LDPC) Coded OFDM Systems: Bit Error Rate and the Number of Decoding Iterations

Hisashi FUTAKI  Tomoaki OHTSUKI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E86-B   No.11   pp.3310-3316
Publication Date: 2003/11/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technology
Keyword: 
OFDM,  turbo codes,  low-density parity-check codes,  belief propagation algorithm,  

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Summary: 
In this letter, we propose the Low-Density Parity-Check (LDPC) coded Orthogonal Frequency Division Multiplexing (OFDM) systems to improve the error rate performance of OFDM. We also evaluate the iterative decoding performance on both an AWGN and a frequency-selective fading channels. We show that when the energy per information bit to the noise power spectral density ratio Eb/N0 is not small, the LDPC coded OFDM (LDPC-COFDM) systems have the good error rate performance with a small number of iterations. We also show that when the Eb/N0 is small, the BER of the LDPC-COFDM systems is worse than that of the Turbo coded OFDM (TCOFDM) systems, while when the Eb/N0 is not small, the BER of the LDPC-COFDM systems is better with a small number of iterations.