tailieunhanh - Báo cáo hóa học: " Subband Array Implementations for Space-Time Adaptive Processing"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Subband Array Implementations for Space-Time Adaptive Processing | EURASIP Journal on Applied Signal Processing 2005 1 99-111 2005 Hindawi Publishing Corporation Subband Array Implementations for Space-Time Adaptive Processing Yimin Zhang Center for Advanced Communications Villanova University Villanova PA 19085 USA Email yimin@ Kehu Yang Electronic Engineering Research Institute School of Electronic Engineering Xidian University Xi an Shaanxi 710071 China Email yang001@ Moeness G. Amin Center for Advanced Communications Villanova University Villanova PA 19085 USA Email Received 1 January 2004 Revised 30 June 2004 Intersymbol interference ISI and cochannel interference CCI are two primary sources of signal impairment in mobile communications. In order to suppress both ISI and CCI space-time adaptive processing STAP has been shown to be effective in performing spatio-temporal equalization leading to increased communication capacity as well as improved quality of service. The high complexity and slow convergence however often impede practical STAP implementations. Several subband array structures have been proposed as alternatives to STAP. These structures provide optimal or suboptimal steady-state performance with reduced implementation complexity and improved convergence performance. The purpose of this paper is to investigate the steady-state performance of subband arrays with centralized and localized feedback schemes using different decimation rates. Analytical expressions of the minimum mean-square error MMSE performance are derived. The analysis assumes discrete Fourier transform DFT -based subband arrays and considers both unconstrained and constrained weight adaptations. Keywords and phrases space-time adaptive processing subband array array processing mobile communications intersymbol interference cochannel interference. 1. INTRODUCTION The applications of wireless communications are rapidly expanding from voice transmission to a wide class of multimedia information. With .