tailieunhanh - Báo cáo hóa học: " WCDMA Uplink Parallel Interference Cancellation—System Simulations and Prototype Field Trials Bo Hagerman"

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: WCDMA Uplink Parallel Interference Cancellation—System Simulations and Prototype Field Trials Bo Hagerman | EURASIP Journal on Applied Signal Processing 2005 11 1725-1735 2005 Bo Hagerman et al. WCDMA Uplink Parallel Interference Cancellation System Simulations and Prototype Field Trials Bo Hagerman Ericsson Research Ericsson AB 164 80 Stockholm Sweden Email Fredrik Gunnarsson Ericsson Research Ericsson AB 58117 Linkoping Sweden Email Hideshi Murai Nippon Ericsson . Tokyo 112-0004 Japan Email Mioko Tadenuma Nippon Ericsson . Tokyo 112-0004 Japan Email Jonas Karlsson Ericsson Research Ericsson AB 164 80 Stockholm Sweden Email Received 1 March 2004 Revised 20 September 2004 Interference cancellation IC is one identified key technology to enhance WCDMA uplink performance. The goal of this contribution is to highlight the relative uplink system capacity improvement available for WCDMA especially in realistic typical urban radio environments when employing receiver implementations including realistic channel estimation searcher and so forth. The performance of the selected limited-complexity parallel IC receiver is first evaluated with link-level simulations in order to provide input to system-level simulations. The system-level methodology is explained and a 40 system-level uplink capacity increase compared to utilizing the conventional RAKE receiver is found. The limited-complexity parallel IC receiver is then evaluated in a single-cell field trial. The trials show that both the mean and the variance of the outer-loop power control is reduced which implies an overall increased capacity and an increased battery life of the terminals. Furthermore the observed capacity gains are in accordance with system simulations. Keywords and phrases CDMA field trials interference cancellation link-level simulations system-level simulations. 1. INTRODUCTION Interference canceling IC is regarded as one of the key technologies for enhancing CDMA