On the Statistical Properties of the CrossInterference in theDSCDMA System Using the WHm/M Concatenated Sequences

Ren Yong; Wei Shuangqing; Shan Xiumin

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On the Statistical Properties of the CrossInterference in theDSCDMA System Using the WHm/M Concatenated Sequences

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- On the Statistical Properties of the CrossInterference in theDSCDMA System Using the WHm/M Concatenated Sequences
- Acta Electronica Sinica Issue 7, (1999)
- 作者机构：
  
  清华大学电子工程系
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN914.4
- Published：1999
- 稿件说明：
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[1]任勇,魏双庆,山秀明.WH-m/M相乘复合码扩频系统的互扰统计特性[J].电子学报,1999(07):6-9.

Ren Yong, Wei Shuangqing, Shan Xiumin. On the Statistical Properties of the CrossInterference in theDSCDMA System Using the WHm/M Concatenated Sequences[J]. Acta Electronica Sinica, 1999, (7).
[1]任勇,魏双庆,山秀明.WH-m/M相乘复合码扩频系统的互扰统计特性[J].电子学报,1999(07):6-9. DOI：

Ren Yong, Wei Shuangqing, Shan Xiumin. On the Statistical Properties of the CrossInterference in theDSCDMA System Using the WHm/M Concatenated Sequences[J]. Acta Electronica Sinica, 1999, (7). DOI：

摘要

本文建立了复合码ＤＳＣＤＭＡ扩频系统的数学模型，推导了多址干扰的数学表示，定义了用户之间的互扰因子，并进行了计算．研究发现：在扩频比相同的条件下，若ＰＮ序列周期大于扩频比，且序列的伪随机性较好，则采用ＷＨｍ／Ｍ复合序列与采用ｍ、Ｍ序列的扩频系统，其互扰因子均呈高斯分布，且数字特征相同；当ＰＮ序列周期等于扩频比时，互扰因子不具有高斯分布特性．该结论不要求扩频比足够大，而且对同步和异步ＤＳＣＤＭＡ通信系统都适用．

Abstract

In this paper

the mathematical expression of the MAI as well as the definition of the crossinterference k

i between two users are developed.The results from the computer calculation show that:when the length of a PN code P with good pseudorandomness is greater than the spreading ratio N

no matter whether using the WHm/M concatenated sequences good pseudorandomness isgreater than the spreading ration N

no mather whether using the WHm/M concatenated sequencesor the m （or M） sequence as the spreading sequences

their crossinterference are all accordant with Gaussian distributions with equal moments characteristics;and when P is equal to N

i is not accordant with Gaussian distribution.This conclusion leads to no need for large spreading ratio and is applied to both synchronous and asynchronous DSCDMA systems.

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