【作者】 王加庆； 于晓燕； 吴乐南；

【Author】 WANG Jiaqing Yu Xiaoyan WU Lenan (Department of Radio Engineering,Southeast University,Nanjing 210096,China)

【机构】 东南大学无线电工程系；

【摘要】 本文利用外部信息转移图技巧设计LDPC编码的数字调幅广播系统,取得令人满意的结果。例如在典型长波信道中所设计的具有线性编码复杂度的非正则LDPC码收敛门限距信道容量不超过0.54dB,码长为10~4时仿真结果距离信道容量不超过1dB。实验还表明在各种广播信道中优化的LDPC码皆优于本文中的Turbo码方案。更多还原

【Abstract】 This paper propose to use extrinsic information transfer(EXIT) chart technique to LDPC coded digital amplitude modulation broadcasting(DAMB) system and achieve satisfactory results.For example,the optimized irregular LDPC code which can be encoded in linear time has a threshold less than 0.54dB away from the capcity of typical long wave channel,and reach channel capacity within 1dB at block size of 10~4.Furthermore,simulation results show that optimized LDPC codes can outperform turbo codes on various broadcast channels.更多还原