Analysis of a Combined Antenna Arrays and Reverse-Link Synchronous DS-CDMA System over Multipath Rician Fading Channels
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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: [email protected] System Development Team, Telecommunication Systems Division, Telecommunication Network, Samsung Electronics, 416 Moetan-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: [email protected] 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.
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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 includes both multiple access interference (MAI) between the multiusers, and intersymbol interference (ISI) arising from the existence of different transmission paths. A promising approach to increase the system capacity through combating the effects of the CCI is the use of spatial processing with an AA at base station (BS), which is also used as a means to harness diversity from the spatial domain [1, 2, 3]. Generally, the AA system consists of spatially distributed antennas and a beamformer which generates a weight vector to combine the array output. Several algorithms have been proposed in the spatial signal processing This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
to design the weights in the beamformer. The application of AA to CDMA has received some attention [4, 5, 6]. For example, a new space-time processing framework for the beamforming with AA in DS-CDMA has been proposed in [4], where a code-filtering approach was used in each receiving antenna in order
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