低复杂度多用户检测算法分析-通信与信息系统专业论文.docxVIP

摘要 多川)，价拍11)技术在传统检测技术的基础仁，充分利川 j 造成 MAI 干扰的所有用 户信号信息对单个用户的信号进行检测，从而具有优良的抗干扰性能，解决了远 近郊(应问题，降低了系统对功率控制精度的要求，因而可以更加有效的利用频滞 源，显著提高系统容量。并能和智能天线技术、功率控制技术相结合，大幅度 提高系统性能，降低系统成本。但多用户检测算法巨大而繁琐的运算量抑制它的 JN 用，对其的改i茬，研究低复杂度易于工程实现的多用户检测算法已经成为第三代 移iJJjffi信 F 个至关重要的工作。 在综述了多用户检测技术的发展状况及其-些新技术在该领域内的发展的基 有:1: 1 ，本文分析了肉牛l典型的基本算法，讨论了多用户检测算法的性能测度标准 和JffYt、边拌jJIL 则。最后，给出了两种改进的多用户检测算法，…种降低了运算量， 快离了系统抗jj!近效应能力:另一种方法是一种简单结构的自适应盲多用户检测 算法。仿占主结;在验证这两种方法在降低了运算量的同时提高了系统性能。 ·关键词:多用户检测码分多址多址干扰匹配滤波 Abstract Multiuser detector (MUD) makes full use of the information of all the users that 创use multiple a∞ess interference (MA1) to detect the desired user. Therefore ，as compared with the conventional detector，it has better resistance capability to the MA1 and the so-called near-也r 严。blem. Since the multi-user detector reduces the precision requirement of the power control，it can provide higher efficiency for frequency use， and thus improves the capacity of the ∞mmunication system. 1n addition，the multi-user det.ector can be used in conjunctíoD wíth the smart antenna and power control techniques ，hence it may reduce the ∞st whíle improving highly the capacity of the system. Unfortunately ，due to heavy computational complexity，the existing algorithms liffiit the application of the multi-user detector，and how to improve them becomes an 崎翩翩 task in the third generation of mobi1e communication systems. Thls P量.per surveys the development of the multi-user detector as well as new techniques used in this field. After two kinds of typical and basíc algorithms ，we introduce the performance index to meas旧e the multi-user detector and the principle used to choose the MUD algorithm. Finally，two upswing algorithms 缸e given，one reduces the computational complexity and improves the resistance capability to the near-far problem ，and the other is an adaptive blind MUD algorithm with a simple s臼Ucture. Keywords: Mult iUser Detection CDMA MAI Ma