tailieunhanh - Báo cáo hóa học: " Subband Adaptive Array for DS-CDMA Mobile Radio"

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 Adaptive Array for DS-CDMA Mobile Radio | EURASIP Journal on Applied Signal Processing 2004 3 418-426 2004 Hindawi Publishing Corporation Subband Adaptive Array for DS-CDMA Mobile Radio Xuan Nam Tran Department of Electronic Engineering The University of Electro-Communications Chofugaoka 1-5-1 Chofu-shi Tokyo 182-8585 Japan Email namtx@ Takanori Omata Department of Electronic Engineering The University of Electro-Communications Chofugaoka 1-5-1 Chofu-shi Tokyo 182-8585 Japan Core Network Planning Department and Switching Network Planning Department Vodafone . Atago 2-5-1 Minato-ku Tokyo 105-6205 Japan Email Tetsuki Taniguchi Department of Electronic Engineering The University of Electro-Communications Chofugaoka 1-5-1 Chofu-shi Tokyo 182-8585 Japan Email taniguch@ Yoshio Karasawa Department of Electronic Engineering The University of Electro-Communications Chofugaoka 1-5-1 Chofu-shi Tokyo 182-8585 Japan Email karasawa@ Received 15 April 2003 Revised 24 September 2003 Recommended for Publication by Mukund Padmanabhan We propose a novel scheme of subband adaptive array SBAA for direct-sequence code division multiple access DS-CDMA . The scheme exploits the spreading code and pilot signal as the reference signal to estimate the propagation channel. Moreover instead of combining the array outputs at each output tap using a synthesis filter and then despreading them we despread directly the array outputs at each output tap by the desired user s code to save the synthesis filter. Although its configuration is far different from that of 2D RAKEs the proposed scheme exhibits relatively equivalent performance of 2D RAKEs while having less computation load due to utilising adaptive signal processing in subbands. Simulation programs are carried out to explore the performance of the scheme and compare its performance with that of the standard 2D RAKE. Keywords and phrases subband adaptive array CDMA RAKE multipath fading. 1. INTRODUCTION Digital