无线通信系统中衰落信道的仿真及信道估计  

Fading channel simulation and channel estimation in wireless communication systems

作　　者：朱耀麟[1] 孟超[1] 张勇[1] 

机构地区：[1]西安工程大学电子信息学院,陕西西安710048

出　　处：《西安工程大学学报》2012年第6期748-751,755,共5页Journal of Xi’an Polytechnic University

基　　金：陕西省教育厅自然科学基金资助项目(11JK1000);西安工程大学博士科研启动基金资助项目(BS0722);西安工程大学教改项目(2010JG12)

摘　　要：针对无线通信信道常常受到多径传播和时变效应的影响的特性,用基于四相相移键控(QPSK)的调制方法对瑞利衰落信道进行仿真和分析.为了在接收端进行信道补偿,降低系统的误码率(BER),给出了基于训练符号的最小二乘(LS)信道估计算法.仿真结果表明,衰落信道会对传输信号造成很大的干扰,基于训练符号的LS信道估计算法接近于理想信道估计,使得系统的BER比未使用信道估计之前得到了明显的降低.证明了该算法可以能很好地提高系统的性能,能达到预期目的.Wireless communication channel is often effected by multipath propagation and time-varying.For the channel of such characteristics,Rayleigh fading channel is simulated and analyzed based on QPSK modulation method.For this that channel is compensated at the receiving end and BER is reduced in the system,the LS channel estimation algorithm is given based on the training symbols.Simulation results show that the transmission signal is caused great interference by the fading channel,the ideal channel estimation is approached by the algorithm,the BER of the system than the unused the channel estimation′s is significantly reduced.Proved that the performance of the system is improved by the algorithm,and achieving the intended purpose.

关 键 词：衰落信道 信道仿真 信道估计 

分 类 号：TN925[电子电信—通信与信息系统]