无线移动通信系统的信道估计算法研究.doc

PAGE PAGE 1 JIU 毕 业 论 文（设 计） 题 目 无线移动通信系统的信道估计算法研究 英文题目 The research of some estimation methods of channel in modern wireless communication systems 院 系 电子工程学院 专 业 通 信 工 程 姓 名 邱 蓉 年 级 二零零三级 指导教师 查 代 奉 二零零七年六月 无线移动通信系统的信道估计算法研究 摘要 在无线移动通信中，信道带宽的有限性可能产生码间干扰(ISI) ,因此可引起信道频率选择性（衰落）。 在基站和移动台之间相对的运动会导致随机的频率调制，并由此使得信道随时间变化，具有时间选择性。通常信道都是同时具有频率选择性和时间选择性。为了实现可靠的通信，接收器必须估计（信道）而且使信道与经由信道导入而产生的失真相均衡。在本篇论文中,时变和频率选择性衰落的估计算法则包括：空间和时间传输方式不同的WCDMA上行和下行链路，以及研究中的MIMO系统。 本文介绍了随时间变化频率的任意信道的一些估计以及预测方法以及在WCDMA上行链路系统中的应用研究，其中的单时隙加权平均算法和多时隙加权平均算法（WMSA）都是经过分析比较得到的。本论文的主要研究工作在于介绍了一种改进的多时隙加权平均算法（MWMSA）,仿真表明其性能优良。 [关键词]：宽带码蜂多址，信道估计，多时隙加权平均，码间干扰 The research of some estimation methods of channel in modern wireless communication systems ABSTRACT In wireless mobile communications, the limitation of channel bandwidth may cause inter symbol interference (ISI) and thus the channel is frequency selective. The relative motion between the base station and the mobile station may cause random frequency modulation and make the channel become with the time. Generally the channel is both frequency selective and time selective. In order to achieve reliable communication, the receiver must estimate and equalize the channel to combat the distortions in the channel. In this paper, the estimation algorithms of time-varying frequency selective channel in modern wireless communication systems including WCDMA uplink, WCDMA downlink with space time transmit diversity and MIMO system are investigated. The main researching work in this paper can be summarized as follows: Some estimation methods of time-varying frequency selective channel are deeply studied in WCDMA uplink system. The algorithms of one slot averaging weighted multi-slot averaging (WMSA) and interpolation are analyzed and compared. The main researching work in this paper is focused on a modified method about weighted multi-slot averaging (MWMSA) which has better capability. The computer simulations are performed for the a