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: Exploiting Phase Diversity for CDMA2000 1X Smart Antenna Base Stations | EURASIP Journal on Applied Signal Processing 2004 9 1420-1430 2004 Hindawi Publishing Corporation Exploiting Phase Diversity for CDMA2000 1X Smart Antenna Base Stations Seongdo Kim Advanced R D Team Ace Technology Seoul 137-130 Korea Email ksd544@ Seungheon Hyeon School of Electrical and Computer Engineering Hanyang University Seoul 133-791 Korea Email hsheon@ Seungwon Choi School of Electrical and Computer Engineering Hanyang University Seoul 133-791 Korea Email choi@ Received 25 June 2003 Revised 4 March 2004 A performance analysis of an access channel decoder is presented which exploits a diversity gain due to the independent magnitude of received signals energy at each of the antenna elements of a smart-antenna base-station transceiver subsystem BTS operating in CDMA2000 1X signal environment. The objective is to enhance the data retrieval at cellsite during the access period for which the optimal weight vector of the smart antenna BTS is not available. It is shown in this paper that the access channel decoder proposed in this paper outperforms the conventional one which is based on a single antenna channel in terms of detection probability of access probe access channel failure probability and Walsh-code demodulation performance. Keywords and phrases phase diversity access channel searching Walsh-code demodulation CDMA2000 1X. 1. INTRODUCTION As the demand of mobile communications increases rapidly the 3G mobile communication system must provide various contents in as high as possible data rate compared to the conventional 2G systems 1 . In order to provide the various contents to the increased number of users it is necessary to secure an extremely accurate detection of synchronization information between base-station transceiver subsystem BTS and each of the subscribers together with a good demodulation technique 2 . For improving the quality of communication services capable of providing the various contents the .
