Adaptive Digital Signal Processing and Its Application to Comnmunication Systems

自适应数字信号处理及其在通信系统中的应用

基本信息

批准号：
10650364
负责人：
NISHIMURA Shotaro
金额：
$ 2.24万
依托单位：
Shimane University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650364/
关键词：
Adaptive Digital Filter IIR Notch FiIter Grandient Method Complex Coefficient Digital Filter Steady-State Characteristics QPSK Narrow-Band Interference Rejection Spread Spectrum Communication Systems 挟帯域干渉除去収束特性ブラインド等化マッチレートフィルタ /

项目摘要

1. Steady-State Analysis of Complex Adaptive IIR Notch FiltersWe present a new structure for complex adaptive infinite impulse response (IIR) notch filter which is useful for the detection of a complex sinusoid in communication and rader systems. The proposed structure is based on gradient algorithm. A quantitative analysis for the steady-state coefficient fluctuation has been obtained. It has been shown that the variance complex coefficient fluctuation does not depend on the angular frequency of the input sinusoid. The results of computer simulations are also shown which confirm the theoretical prediction.2. Adaptive Narrow-Band Interference Suppression Using IIR Notch FilterImprovement of direct sequence spread spectrum (DSSS) communication systems' performance using a lattice based adaptive IIR notch filter with a simplified adaptation algorithm is presented. The improvement is shown to be achieved by rejection of a narrowband interference in a received DSSS binary phase shift keying (BPSK) signal. Apart from noise associated with input additive white gaussian noise, noise attributed to leakage sinusoids due to fluctuation of steady-state variable coefficients is also analysed. Using statistical properties of notch filter and pseudonoise (PN) correlator outputs, improvement of the performance of a DSSS systems gained by the use of interference rejection filter is shown. Computer simulation results are used to confirm analytically derived expressions.

1。复杂自适应IIR Notch Filterswe的稳态分析为复杂自适应无限脉冲响应（IIR）Notch滤波器提供了一种新结构，该结构可用于检测通信和辐射系统中复杂的正弦曲线。所提出的结构基于梯度算法。已经获得了稳态系数波动的定量分析。已经表明，方差复合系数波动不取决于输入正弦的角频率。还显示了计算机模拟的结果，以证实理论预测2。提出了使用基于晶格的自适应IIR Notch滤波器具有简化适应性算法的直接序列扩散频谱（DSS）通信系统的性能的自适应窄带干扰抑制。该改进被证明是通过在接收到的DSSS二元相移键合（BPSK）信号中排斥窄带干扰来实现的。除了与输入添加剂白色高斯噪声相关的噪声外，还分析了由于稳态可变系数波动而导致的正弦曲线的噪声。使用Notch Filter和Pseudonoise（PN）相关器输出的统计属性，显示了通过使用干扰拒绝过滤器获得的DSSS系统性能的改善。计算机仿真结果用于确认分析得出的表达式。