tailieunhanh - Báo cáo hóa học: " Analysis of a Combined Antenna Arrays and Reverse-Link Synchronous DS-CDMA System over Multipath Rician Fading Channels"

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: Analysis of a Combined Antenna Arrays and Reverse-Link Synchronous DS-CDMA System over Multipath Rician Fading Channels | EURASIP Journal on Wireless Communications and Networking 2005 2 260-269 2005 Hindawi Publishing Corporation Analysis of a Combined Antenna Arrays and Reverse-Link Synchronous DS-CDMA System over Multipath Rician Fading Channels Yong-Seok Kim Communication Systems Lab School of Electrical and Electronics Engineering Yonsei University 134 Sinchon-Dong Seodaemun-Gu Seoul 120-749 Korea Email dragon@ System Development Team Telecommunication Systems Division Telecommunication Network Samsung Electronics 416Moetan-3Dong Yeongtong-Gu Suwon-City Gyeonggi-do 442-600 Korea Keum-Chan Whang Communication Systems Lab School of Electrical and Electronics Engineering Yonsei University 134 Sinchon-Dong Seodaemun-Gu Seoul 120-749 Korea Email kcwhang@ Received 19 May 2004 Revised 6 December 2004 Recommended for Publication by Arumugam Nallanathan We present the BER analysis of antenna array AA receiver in reverse-link asynchronous multipath Rician channels and analyze the performance of an improved AA system which applies a reverse-link synchronous transmission technique RLSTT in order to effectively make a better estimation of covariance matrices at a beamformer-RAKE receiver. In this work we provide a comprehensive analysis of user capacity which reflects several important factors such as the ratio of the specular component power to the Rayleigh fading power the shape of multipath intensity profile and the number of antennas. Theoretical analysis demonstrates that for the case of a strong specular path s power or for a high decay factor the employment of RLSTT along with AA has the potential of improving the achievable capacity by an order of magnitude. Keywords and phrases antenna arrays reverse-link synchronous DS-CDMA multipath Rician fading channel. 1. INTRODUCTION CDMA systems have been considered as attractive multipleaccess schemes in wireless communication. But these schemes have capacity limitation caused by cochannel interference CCI which .