DS-CDMA系统多波形优化的多址干扰抑制方法

李清伟 1; 郭黎利 1; 2

doi:10.7652/xjtuxb201710016

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DS-CDMA系统多波形优化的多址干扰抑制方法

更新时间：2025-07-09

- DS-CDMA系统多波形优化的多址干扰抑制方法
- A Multi-Address Interference Suppression Method with Multiple Waveform Optimization for DS-CDMA Systems
- 西安交通大学学报 2017年51卷第10期页码：94-99+106
- 作者机构：
  
  哈尔滨工程大学信息与通信工程学院,哈尔滨,150001
- 作者简介：
- 基金信息：
  
  : 2017-02-19。作者简介: 李清伟(1987—),男,博士生;郭黎利(通信作者),男,教授,博士生导师。基金项目: 国家自然科学基金资助项目(61401196);通信网信息传输与分发技术重点实验室开放基金资助项目(KX152600015/ITD-U15006)
- DOI：10.7652/xjtuxb201710016
  中图分类号： TN914.53
- 网络首发：2017-10-10，
  
  纸质出版：2017
- 稿件说明：
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李清伟 1, 郭黎利 1, 2. DS-CDMA系统多波形优化的多址干扰抑制方法[J]. 西安交通大学学报, 2017,51(10):94-99+106.

A Multi-Address Interference Suppression Method with Multiple Waveform Optimization for DS-CDMA Systems[J]. 2017, 51(10): 94-99+106.
李清伟 1, 郭黎利 1, 2. DS-CDMA系统多波形优化的多址干扰抑制方法[J]. 西安交通大学学报, 2017,51(10):94-99+106. DOI： 10.7652/xjtuxb201710016.

A Multi-Address Interference Suppression Method with Multiple Waveform Optimization for DS-CDMA Systems[J]. 2017, 51(10): 94-99+106. DOI： 10.7652/xjtuxb201710016.

摘要

针对异步直扩-码分多址(DS-CDMA)系统多址干扰引起误码率性能降低的问题

提出了DS-CDMA系统多波形优化的多址干扰抑制方法。首先

从常规波形中选取所有q(q≥3)种波形组合

通过q种波形能量谱的平均分别计算每种组合的等效波形能量谱; 然后

引入能量谱平坦度量化计算每种组合的等效波形能量谱平坦度; 最后

优化选取平坦度大的波形组合

并循环使用这些优化波形组合与扩频序列进行扩频信号的构造

同时

CDMA用户在发射端使用构造的扩频信号扩频并在接收端使用同样的扩频信号进行解扩。仿真结果表明:与双波形方法相比

多波形优化方法能够有效抑制用户间的多址干扰

使多址干扰下的CDMA用户误码率性能提升2 dB。

Abstract

A method to suppress multi-address interference(MAI)with multiple waveform optimization for DS-CDMA systems is presented to focus on the problem of bit error rate(BER)performance reduction for MAI. All q(q≥3)waveform combinations(WC)are selected from the conventional waveforms. The equivalent waveform energy spectrum of each WC is calculated through averaging the energy spectrum of the q kinds of waveforms. Then

the energy spectrum flatness is introduced to calculate the flatness of these equivalent waveform energy spectrums. The WC with a larger flatness is selected and is circularly used with spread-spectrum sequence to obtain the spread-spectrum signal. CDMA users use the spread-spectrum signal to spread spectrum at transmitting terminals and to despread-spectrum at receiving terminals simultaneously. Simulation results and a comparison with the double chip waveform method show that the MAI among CDMA users is effectively suppressed

and the value of MAI parameter is further reduced by the multiple waveform optimization method while the BER performance improves by 2 dB.

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references

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