標題: | Narrow-band interference rejection in DS/CDMA systems using adaptive (QRD-LSL)-based nonlinear ACM interpolators |
作者: | Yuan, JT Lee, JN 電信工程研究所 Institute of Communications Engineering |
關鍵字: | approximate conditional mean (ACM) nonlinear;filter;code-division multiple access (CDMA);interpolation filters;lattice structure;least mean square (LMS)-based filters;narrow-band interference (NBI) suppression;prediction filters;predictors;QR-decomposition-based least squares lattice;(QRD-LSL) interpolators |
公開日期: | 1-三月-2003 |
摘要: | An Mth order adaptive lattice filter automatically generates all M of the outputs that would be provided by M separate transversal filters. This feature may effectively suppress the narrow-band interference (NBI) of either unknown or time-varying bandwidth (or number of frequency bands) in direct-sequence code-division multiple access systems for which the order of the interference rejection filter that achieves the optimal performance is unknown or constantly changing. Moreover, a lattice filter may significantly outperform its transversal counterpart in complex jamming environments in which the adaptive lattice filter must suppress multiple jammers, since each stage of a lattice filter adapts to suppress an orthogonal component of the NBI. This paper,develops a computationally efficient and numerically stable adaptive QR-decomposition-based least squares lattice (QRD-LSL)-based nonlinear approximate conditional mean interpolator to suppress NBI effectively. Simulation results demonstrate that both the signal-to-noise ratio improvements and the convergence rate achieved by the proposed interpolators outperform those of other existing prediction-based techniques. |
URI: | http://dx.doi.org/10.1109/TVT.2002.808808 http://hdl.handle.net/11536/28041 |
ISSN: | 0018-9545 |
DOI: | 10.1109/TVT.2002.808808 |
期刊: | IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY |
Volume: | 52 |
Issue: | 2 |
起始頁: | 374 |
結束頁: | 379 |
顯示於類別: | 期刊論文 |