CMRLS RAKE Receiver with Space Diversity and AIC

• Main Authors: Chun-Cheng Li, 李君政
• Other Authors: Shun-Hsyung Chang
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/49062583578385073230

碩士 === 國立臺灣海洋大學 === 電機工程學系 === 94 === Abstract Although conventional RAKE receiver can compensate for multi-path fading, but multiple-access interference (MAI) was not considered in this scheme. When users of the system increasing, the performance of system which used RAKE receiver will decay. In order to overcome the problem of multiple-access interference, we use an adaptive interference canceller(AIC) which compose of a code-orthogonalizing filter(COF) and a differential detector(DD).To improve the quality of received signal, we combine maximal ratio combining(MRC).Above-mentioned adaptive RAKE receiver can support high data rate without bandwidth expansion and overcome MAI, but training sequences and convergence speed is its fault. In this paper, we propose a constant modulus recursive least square(CMRLS) RAKE receiver which combined with constant modulus recursive least square algorithm. So we called CMRLS RAKE with space diversity and adaptive interference cancellation. Under multiple path fading, we compared a RAKE receiver which we proposed and conventional RAKE receiver. We found that former not only own the advantage of blind filtering technique and faster convergence speed, but also improve system performance in BER. Simulations confirm the RAKE receiver which we proposed is superiority over the conventional RAKE receiver in terms of the performance of SINR and BER. Keyword：Multiple Access Interference、Adaptive Interference Canceller、Adaptive RAKE Receivers.