基于HINOC协议的高阶QAM调制与解调  

作　　者：谢静[1] 吴巍 王俊峰 

机构地区：[1]南京邮电大学 [2]南京宇都通讯科技有限公司

出　　处：《中国集成电路》2016年第11期67-72,共6页China lntegrated Circuit

摘　　要：基于国家下一代宽带接入技术HINOC[1]2.0标准,采用正交频分复用(OFDM)和高阶QAM调制相结合的技术,可实现高速可靠的数据传输。本文讨论了HINOC2.0标准中高阶QAM调制和解调的算法,并将两种解调算法进行对比仿真。其中一种是直接硬解调算法,另一种是软信息硬解调算法。基于Bahl等人提出的逐符号最大后验概率译码算法,推导了对数似然比公式,并采用Max-log公式对其进行了简化。仿真结果表明,在AWGN信道下,系统BER达到2×10-5时,采用软信息硬解调算法比采用直接硬解调算法整体性能上提升2d B左右。简化的软信息求解方法,计算量小,具有良好的性能。HINOC 2.0 is a standard for next-generation broadband access technologies being developed by China.The standard adopts Orthogonal Frequency Division Multiplexing （ OFDM ） and Quadrature Amplitude Modulation （ QAM ）, to achieve high throughout and reliable data transmission.In this paper ,we specify the algorithm of high order QAM＇ s modulation and demodulation,and compare the performance of two kinds of demodulation algorithm. One is the algorithm of hard-demodulation,another is the algorithm of hard-demodulation of soft information.Based on Bahl＇ s maximum posterior probability decoding algorithm for incoming symbol, logarithm likelihood ratio （ LLR ） algorithm is deduced, the Max-log formula is used to simplify the computation. Simulation results show that,in AWGN channels,when the bit error ratio （ BER ） of system reaches 2 ×10-5, the algorithm of hard-demodulation of soft information is better than the algorithm of hard-demodulation of hard information. A simplified soft-information algorithm with low computational complexity and high performance is also developed.

关 键 词：正交频分复用 高QAM 硬解调 软信息硬解调 

分 类 号：TN911.3[电子电信—通信与信息系统]