摘要
网格编码调制技术(TCM)是一种将编码与调制有机结合起来的技术,可使系统的频带利用率和功率资源同时得到有效利用。在对TCM原理和结构分析的基础上,研究了网格编码调制技术中的几个关键技术,主要包括集分割原理和无线信道下TCM误码率的分析,最后对无编码的QPSK与8PSK-TCM进行了仿真比较。仿真结果表明,在无线信道相同的误码率下,采用网格编码调制技术比未编码QPSK获得2 dB的编码增益。
Trellis coded modulation （TCM） is a technique which can comfortably combine coding and modulation, it can improve the system＇s bandwidth efficiency and power resources. Several key techniques are researched based on trellis coded modulation theory and structural analysis, the set partitioning principle and the bit error rate of Trellis coded modulation in wireless channel are analyzed, and the non-coded QPSK and 8PSK-TCM are simulated and compared. The simulation results indicate that the trellis coded modulation can get a better code gain than non-coded QPSK in the same bit error rate in wireless channel.
出处
《现代电子技术》
2010年第23期67-70,共4页
Modern Electronics Technique
关键词
网格编码调制
调制映射
最大自由欧氏距离
编码增益
Trellis coded modulation
modulation mapping
maximum free Euclidean distance
code gain
