Adaptive Antennas with Timing Recovery for Multiuser DS/CDMA Communication Systems

• Main Authors: Yen-Han Liao, 廖彥涵
• Other Authors: 翁芳標
• Format: Others
• Language: en_US
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/43001073591762397957

碩士 === 國立中興大學 === 電機工程學系所 === 94 === Lately, the smart antenna has brought much attention to its skill to improve the future code-division multiple-access (CDMA) wireless communications systems. These systems of antennas include a lot of techniques that attempt to better the received signal, inhibit all interfering signals, and increase capacity, mainly. In this paper, we use least mean square (LMS) algorithm and propose two adaptive antenna receiver structures for direct sequence code division multiple access (DS-CDMA) multiuser environment with multipath fading channels. The coherent receiver estimate the desired signal and code delay to perform code synchronization by LMS algorithm simultaneously. In the proposed schemes, an "error signal" is used to update the weights of the adaptive beamformer and the estimated code delay. Simulations confirm the good performance, including timing tracking and BER, of the proposed coherent receiver structures.