一种指数型变步长仿射投影算法  

An Exponential Variable Step-Size Affine Projection Algorithm

作　　者：范永全[1] 周波[2] 

机构地区：[1]西华大学数学与计算机学院,四川成都610039 [2]中国电子科技集团第30研究所,四川成都610041

出　　处：《通信技术》2010年第2期195-197,共3页Communications Technology

基　　金：国家自然科学基金(批准号:60572027)

摘　　要：可变平滑因子的变步长仿射投影算法需要根据投影误差范数的变化确定"触发点",并切换平滑因子,实现较为复杂。为此这里提出了一种改进的指数型变步长仿射投影算法。该方法直接将投影误差的范数通过指数函数映射得到平滑因子,有效降低了实现复杂度。仿真结果表明该算法的均方偏差性能优于变步长仿射投影算法和常规的仿射投影算法。The variable step-size affine projection algorithm （VS-APA） with variable smoothing factor （VS-APA-VSF） needs to determine the ＂trigger point＂ and switch smoothing factors based on the evolution of the projected error norm, which is not conducive to practical applications. Thus an improved exponential variable step-size affine projection algorithm （VS-APA-EXP） is proposed, which could achieve proper smoothing factors directly by transferring the projected error norm through exponential function, thus reducing the implementation complexity greatly. Simulation results show that the proposed VS-APA-EXP algorithm outperforms the VS-APA and conventional APA algorithms in terms of mean square deviation （MSD）.

关 键 词：变步长 仿射投影算法 平滑因子 

分 类 号：TN911.72[电子电信—通信与信息系统]