CDMA通信编码的设计与实现.doc

I CDMA 通信编码的设计与实现摘要为了研究 CDMA 通信系统中伪随机序列对系统性能的影响,得出能适用于对扩频序列的性能要求苛刻的各种扩频通信系统的 CDMA 序列。本论文从 m 序列和 gold 序列的生成方式出发,利用 simulink 对二者进行仿真分析,在传统的 gold 序列的基础上,以 m 序列为原型设计出非平衡正交 gold 序列,找出其平衡序列,并对此进行仿真分析。通过三者的波形、频谱图、误码率等结果, 对系统进行了性能分析。由误码率分析表明, 正交 gold 序列具有很强的抗干扰能力, 证明此序列能更好的适用于对扩频序列的性能要求苛刻的各种扩频通信系统中。关键词: 伪随机序列;平衡性;正交序列 II munication coding ’s Design and implementation Abstract In order to study the pseudo-random sequence in the munication system will affect the performance of the system, it is concluded that to apply to the demanding of the performance of spread spectrum sequence of various sequences of CDMA spread munication system. In this paper, starting from the generation ofm sequence and gold sequence, both to make use of simulink simulation analysis, on the basis of the traditional gold sequence, with m sequence isa non-equilibrium orthogonal sequences of gold for the design of the prototype, find out the balance sequence, and the simulation analysis. Through the three waveform, spectrum, bit error rate, etc. As a result, the system for the performance analysis. By ber analysis shows that the orthogonal gold sequence has a strong anti-interference ability, prove that this sequence is better suitable for the performance of spread spectrum sequence demanding various kinds of spread munication system. Key Words :p seudo random sequence , balance, orthogonal sequences 目录摘要.................................................................................................................................. I Abstract ............................................................................................................................... II ................................................................................................................................ 1 CDMA 的简介.............................................................................................................. 1 CDMA 的现状..................................................................