正交序列扩频多码CDMA系统在AWGN信道的性能分析

Performance Analysis of Orthogonal Sequence Multicode CDMA System in AWGN Channel

在直接序列扩频通信（ＤＳ－ＣＤＭＡ）系统中，为了有效地实现用户高数据率的传输，本文提出了一种正交扩频多码ＣＤＭＡ系统（称为ＯＭＣ－ＣＤＭＡ）。相似于多载波调制，传输的高数据率首先进行串－并转换，然后对转换后的低数据流用正交序列进行扩频调制。不同于多载波调制，各支路扩频信号用同一载波进行调制。这里，我们对此系统在ＡＷＧＮ信道的性能进行了计算，并对数值结果进行了分析。

In direct sequence spread spectrum multiple access (DS CDMA) communication system, in order to transmit high rate data, a orthogonal sequence multicode CDMA system (called OMC CDMA) is proposed. Like multicarrier modulation, the high rate data transmitted at first by serial to parallel convert, then the low rate data streams are spreaded spectrum by a set of orthogonal sequence. Not like multicarrier modulation, all low branch data streams use singal carrier. In this paper, the performance of the system in AWGN chnnel is calculated, and numerical result is analyszed.