【作者】 陈红； 范平志；

【Author】 Chen Hong, Fan Pingzhi(Institute of Mobile Communications, Southwest Jiaotong University, Chengdu 610031)

【机构】 西南交通大学移动通信研究所；

【摘要】 基于一阶统计量的隐训练序列信道估计方法,本文从训练序列长度、训练序列功率与数据序列分配、统计长度等方面研究了时变信道下16QAM调制系统的性能特性。研究表明,对于时变衰落信道,需要合理选择训练序列周期和统计长度,并合理分配训练序列和数据序列之间的功率,以最小化信道估计误差和系统误码率。另外,由于信道估计误差的存在,在数据序列恢复时,除了不能完全消除衰落的影响外,在数据序列中还会引入训练序列的干扰,从而增加系统的误码率。本文的仿真分析显示,当信道估计误差的方差小于10-4时,16QAM系统可以获得接近理想信道估计时的误码率性能,这一结果具有重要实用意义。更多还原

【Abstract】 In this paper, the performance of implicit training assisted 16QAM is investigated on different factors such as the length of training sequence, power allocation between training and data sequence, the length of the first-order statistics, etc. Our investigation demonstrates that these factors should be considered carefully to minimize the channel estimation error and bit error rate in time - varying fading channel. Because of the channel estimation error, not only the channel fading can not be eliminated from the received signal completely, but also the data sequence will be interfered by the residual training sequence, thus degrading the bit error rate of the 16QAM system. The simulation results show that, if the variance of channel estimation error is less than 10-4, the 16QAM system can achieve the preferred BER performance similar to the one with perfect channel estimation.更多还原