Encoding and decoding scheme of LDPC codes based on pulse position modulation

被引：0
|
作者：
State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an 710071, China [1 ]
不详 [2 ]
机构：
[1] State Key Lab. of Integrated Service Networks, Xidian Univ.
[2] Department of Electronic Engineering, City University of Hong Kong, Hong Kong
来源：
Dianzi Yu Xinxi Xuebao | 2008年 / 11卷 / 2630-2633期
关键词：
Low-Density Parity-Check (LDPC) codes; Low-rate codes; Pulse position modulation;
D O I：
10.3724/sp.j.1146.2007.00693
中图分类号：
学科分类号：
摘要：
In this paper, a low-rate LDPC-PPM scheme is bring forward which can be applied into UWB communication systems. This scheme can provide good performance with low decoding complexity. By changing the mapping style from coded bits to modulated symbols, not only the iterative operations between decoding and demodulation can be avoided, but also Fast Hadamard Transformation (FHT) and the so called A Posteriori Probability FHT (APP-FHT) algorithm can be adopted to further decrease decoding complexity. It can be proved that this scheme is equivalent to low-rate LDPC-Hadamard codes with BPSK modulation. Simulation results show that this scheme can achieve -1.18 dB at bit error rate 10-5 with data length 65536, which is only worse 0.02 dB than Turbo-Hadamard codes with BPSK modulation.
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页码：2630 / 2633
页数：3
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