【作者】 杨丽；

【导师】 肖丽萍；

【作者基本信息】 燕山大学 ， 通信与信息系统， 2006， 硕士

【摘要】 近年来随着多媒体,互联网等移动通信新业务的发展,频谱资源日益紧张,开发高效的编码、调制和信号处理技术已成为提高无线频谱效率的当务之急。空时编码技术将信道编码技术和天线分集技术结合,改善了分集增益和编码增益,并有效地减弱了干扰和多径衰落,从而大幅度提高了无线通信系统的容量,为解决无线通信中的带宽问题提供了一条新的解决途径。空时编码包括三种基本类型:分层空时编码、空时格型编码和空时分组编码。其中基于正交设计的空时分组编码,由于其相对简单的编、译码方法和较好的性能而倍受关注。本文的研究就是针对正交空时分组码进行的,主要内容如下:(1)深入研究了空时分组编码的简易配方译码算法,在研究瑞利衰落下空时分组码信道容量的基础上,推导出空时分组码在更具一般性的Nakagami信道模型下的信道容量公式,并进行了仿真。(2)深入研究了匙孔信道,将多输入多输出的匙孔Nakagami信道等效为单输入单输出的信道,在此基础上推导了空时分组码在匙孔Nakagami衰落下的信道容量公式,进行了仿真和分析,并与非匙孔时的情况做出比较,得到一些对实际空时分组码系统具有一定参考价值的结论。(3)研究了空时分组码的性能。推导了匙孔Nakagami衰落下空时分组码的误符号率表达式,而且建立了该信道的仿真模型,完成了蒙特卡罗仿真,并与推导公式的仿真结果进行比较,验证了本文推导的正确性。更多还原

【Abstract】 With the development of media and Internet, the frequency resource ofcommunication system is more limited.To develop the highly efficient coding,modulation and signal processing technology is becoming the most necessarymeasure to improve the spectrum efficiency.Space-time coding(STC) combinesthe technique of channel coding and antenna diversity,it improves the diversitygain and coding gain remarkably and eliminates the interference and contradictthe multipath fading effectively.So STC increases the capacity of wirelesscommunication greatly.This technique provides a new solution to the problemof limited bandwidth in wireless communication.Space-time coding includes layered space-time coding(LSTC),space-timetrellis coding(STTC) and space-time block coding(STBC).The orthogonalSpace-time block coding(STBC) is deeply concerned because of its simpleencoded,decoded algorithm and the better performance. The main contents areas follows:(1)The simple squaring decode algorithm of STBC is deeply studied.Basing on studying the channel capacity over the rayleigh fading,the paperdeduced the capacity formula of STBC over the Nakagami fading channels andsimulated the capacity.(2)The paper deeply studied the keyhole channels. Firstly Equalized theMIMO Nakagami fading channels to a SISO channels,basing on this,thecapacity formula of STBC over the keyhole Nakagami fading channels isderived.The result is also simulated and analyzed.The paper compared thiscapacity over the keyhole with the capacity over the non-keyhole.Theconclusions have certain reference value for the actual application of STBC.(3)The performance of STBC is analyzed.The expression of symbol errorrate(SER) of STBC is deduced.We also established the simulation model andgot the Monte Carlo simulation results.Then compared the results with thenumerical simulation results and verified the expression of SER we deduced iscorrect.更多还原