清华大学电子工程系
纸质出版:1999
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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).
本文建立了复合码DSCDMA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WHm/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DSCDMA通信系统都适用.
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
k
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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