Low-density parity-check (LDPC) coded OFDM systems
Low-density parity-check (LDPC) coded OFDM systems
复制标题
低密度奇偶校验 (LDPC) 编码 OFDM 系统
DOI：
10.1109/vtc.2001.956560
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
T. Ohtsuki
中科院分区：
文献类型：
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作者：
H. Futaki;T. Ohtsuki
正交频分复用技术（OFDM）是一种非常有吸引力的技术，用于在多径衰落环境中产生码间干扰（ISI）的高比特率数据传输。有许多纠错码应用于OFDM，卷积码，里德-所罗门码，涡轮码，等等。低密度奇偶校验码尤其在编码理论领域受到了广泛的关注。LDPC码由Gallager（1962）提出，性能非常接近香农极限，具有与turbo码一样的实际译码复杂度。为了提高OFDM的误码率，提出了LDPC编码OFDM （LDPC- cofdm）系统。结果表明，在AWGN信道上，LDPC-COFDM的误码率低于TCOFDM，而在频率选择衰落信道上，LDPC-COFDM的误码率优于涡轮编码OFDM （TCOFDM）。
Orthogonal frequency division multiplexing (OFDM) is a very attractive technique for high-bit-rate data transmission in a multipath fading environment that causes intersymbol interference (ISI). There are many error-correcting codes applied to OFDM, convolutional codes, Reed-Solomon codes, turbo codes, and so on. Low-density parity-check (LDPC) codes have attracted much attention particularly in the field of coding theory. LDPC codes were proposed by Gallager (1962) and the performance is very close to the Shannon limit with practical decoding complexity like turbo codes. We propose LDPC coded OFDM (LDPC-COFDM) systems to improve the bit error rate (BER) of OFDM. We show that the BER of the LDPC-COFDM is worse than that of the TCOFDM on an AWGN channel, while that of the LDPC-COFDM is better than that of the turbo-coded OFDM (TCOFDM) on a frequency-selective fading channel.