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智能天线CDMA系统中多用户检测器仿真模型设计
20页1、智能天线CDMA系统中多用户检测器仿真模型设计目 录摘 要1Abstract2第一章 绪论31.1 课题研究的背景及意义31.2 课题研究现状41.3 课题研究内容与章节安排5第二章 仿真模型设计62.1 CDMA系统信号模型62.2 LS-SDCMA算法72.3 多用户检测器性能指标82.4 本章小结8第三章 性能分析与仿真103.1 设计流程图103.2 代码实现设计思路113.3 仿真结果分析133.4 小结15第四章 总结与展望16致 谢17参考文献182摘 要因为CDMA系统具有软切换、系统容量大、抗干扰能力强等优点而被广泛应用于第三代移动通信系统中。但是CDMA系统也存在着一些缺点,实际上在通信系统使用的过程中,经常会出现多个系统用户接随机入系统的情况,因为所使用的扩频码间的不完全正交性而导致CDMA系统会产生多址干扰。如果我们采用传统的检测方法对CDMA系统进行检测,那么系统往往会将多址干扰识别成高斯白噪声,导致CDMA系统的系统容量受到限制,影响了整个系统的性能。多用户检测技术则能够减小多址干扰的影响,它的主要功能是从相互干扰的数字序列中有效地检测出来某个特定或者全部用
2、户信息,从理论上消除多址干扰1。在本次的仿真模型设计中,我们主要使用的方法是最小二乘恒模算法(LSCMA)与最陡下降算法(SDCMA)结合起来,演变成一种新的LS-SDCMA算法,利用这种算法来检测CDMA系统的输出信号。仿真的基本步骤是使用Matlab分别建立CDMA系统仿真模型与CMA多用户检测器仿真模型,仿真分析CMA算法在CDMA系统中的误码特性,并且分析衡量仿真所得的数据是否符合我们的理论结果。关键词:CDMA系统,多用户检测器,LS-SDCMA AbstractCDMA system is widely used in the third generation mobile communication system because of its advantages of soft handover, large capacity and strong anti-interference capability. However, there are some shortcomings in the CDMA system. In fact, in the process o
3、f using the communication system, there are often a number of system users receiving random access to the system, because the incomplete orthogonality between the spread spectrum codes leads to the multiple access interference of the CDMA system. If we use traditional detection methods to detect the CDMA system, the system often identifies multiple access interference as Gauss white noise, which leads to the limitation of the system capacity of the CDMA system, which affects the performance of t
4、he whole system. Multi user detection technology can reduce the impact of multiple access interference. Its main function is to effectively detect a certain or all user information from the digital sequence of mutual interference, and eliminate multiple access interference in theory.In the design of this simulation model, we mainly use the least square constant modulus algorithm (LSCMA) and the steepest descent algorithm (SDCMA) to evolve into a new LS-SDCMA algorithm to detect the output signal
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