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变换域自适应滤波技术在扩频通信抗窄带干扰中的应用
Applications of Transform Domain Adaptive Filtering Technique in Narrow Band Interference Excision of Spread Spectrum Communication Receiver
【摘要】 在众多变换域抗窄带干扰的信号处理技术中,自适应滤波具有对干扰频率不敏感的优点,且其权值调整是基于对系统参数的优化.但由于必须通过迭代收敛达到稳态解,自适应滤波算法不能锁定快变干扰.文中利用正交加速算法提高最小均方误差(LMS)算法的收敛速度,推导出了使用变换域自正交加速算法时系统误码率的解析表达式.仿真结果表明,采用自正交化可以大幅度提高自适应算法的收敛速度,从而为基于变换域自适应滤波技术的接收机走向实用提供了理论基础
【Abstract】 The transform domain adaptive filtering is not capable of tracking the rapidly changed interference because most adaptive algorithms require time to converge to the optimal solution. In this paper, self orthogonalization was used to speed up the convergence rate of transform domain adaptive least mean square (LMS) algorithm, and the analytical expression of system bit error rate (BER) was deduced. The simulation results demonstrate that the self orthogonalization can significantly improve the convergence rate of the transform domain LMS algorithm, thus makes the transform domain adaptive filtering technique much suitable for the real time processing.
【Key words】 transform domain excision; adaptive filtering; spread spectrum communication; interference excision;
- 【文献出处】 上海交通大学学报 ,JOURNAL OF SHANGHAI JIAOTONG UNIVERSITY , 编辑部邮箱 ,2000年02期
- 【分类号】TN914.4
- 【被引频次】8
- 【下载频次】172