TAILIEUCHUNG - Báo cáo hóa học: " Coherent Code Tracking for Spatial Transmit Diversity DS-CDMA Systems"

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: Coherent Code Tracking for Spatial Transmit Diversity DS-CDMA Systems | EURASIP Journal on Applied Signal Processing 2005 16 2739-2747 2005 Hindawi Publishing Corporation Coherent Code Tracking for Spatial Transmit Diversity DS-CDMA Systems Garrey W. Rice DSP Enabled Communications Group Department of Electronic and Electrical Engineering University of Strathclyde Glasgow G1 1XW Scotland UK Email garrey@ Iain G. Stirling DSP Enabled Communications Group Department of Electronic and Electrical Engineering University of Strathclyde Glasgow G1 1XW Scotland UK Email iain@ R. W. Stewart DSP Enabled Communications Group Department of Electronic and Electrical Engineering University of Strathclyde Glasgow G1 1XW Scotland UK Email Received 6 February 2004 Revised 23 February 2005 Spatial transmit diversity schemes are now well integrated into third-generation cellular mobile communication system specifications. When DS-CDMA-based technology is deployed in typical macro- and microcell environments multipath diversity and spatial diversity may be exploited simultaneously by a 2D RAKE receiver. The work presented in this paper focuses on taking advantage of spatial transmit diversity in synchronising the 2D RAKE structure. We investigate the use of coherent and noncoherent techniques for tracking the timing parameters of each multipath component. It is shown that both noncoherent and coherent techniques benefit from transmit diversity. Additionally the performance gap between these two techniques increases with the number of antennas. Keywords and phrases DS-CDMA 2D RAKE transmit diversity coherent delay-locked loop. 1. INTRODUCTION For direct-sequence code-division multiple-access DS-CDMA communications antenna diversity techniques have been proposed and implemented to mitigate the effects of multipath fading 1 2 . One economical way of deploying such diversity is to use multiple antennas at the base station and a single antenna at the mobile station 3 . With such an architecture uplink

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