Shaping Gain of LDPC Coded-QAM Transmitting Systems with Non-Uniform Constellation

摘要：

In this paper shaping gains of regular (3,6) LDPC Coded-QAM transmitting systems with non-uniform QAM constellation are presented over AWGN channel. The influences of code rate, frame length, the order of non-uniform QAM constellation, and the finite fields GF(q) of LDPC codes on shaping gain are investigated. It is found that shaping gain of proposed system with non-uniform 64QAM constellation for binary LDPC codes (R=1/2) can be obviously achieved by middle frame length, and can be improved further with the increase of frame length. Meanwhile it is found that under non-uniform 16QAM constellation for binary LDPC code(R=1/2) there is no shaping gain improvement with the increase of frame length, but the shaping gains of non-uniform 16QAM and 64QAM both are increased, even the former is no less than the latter when we change the finite fields GF(q) of LDPC codes from 2 to 16. The shaping gain can disappear as the binary code rate increases to 3/4 in proposed system.

作者: Minhan Zheng Lin Wang Yuliang Tang

作者单位: Dept of Communication Engineering, Xiamen University, Xiamen Fujian361005 China

会议类型: 国际会议

会议名称: 2007年通信、电路与系统国际会议(2007 International Conference on Communications,Circuits and Systems Proceedings)

会议地点: 日本福冈

会议语种:英文

在线出版日期: 2007-07-11（万方平台首次上网日期，不代表论文的发表时间）