tailieunhanh - Báo cáo hóa học: " Research Article Distributed Iterative Multiuser Detection through Base Station Cooperation"

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: Research Article Distributed Iterative Multiuser Detection through Base Station Cooperation | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 390489 15 pages doi 2008 390489 Research Article Distributed Iterative Multiuser Detection through Base Station Cooperation Shahid Khattak Wolfgang Rave and Gerhard Fettweis Vodafone Chair Mobile Communications Systems Technische Universitat Dresden 01062 Dresden Germany Correspondence should be addressed to Shahid Khattak khattak@ Received 1 August 2007 Revised 18 December 2007 Accepted 13 February 2008 Recommended by Huaiyu Dai This paper deals with multiuser detection through base station cooperation in an uplink interference-limited high frequency reuse scenario. Distributed iterative detection DID is an interference mitigation technique in which the base stations at different geographical locations exchange detected data iteratively while performing separate detection and decoding of their received data streams. This paper explores possible DID receive strategies and proposes to exchange between base stations only the processed information for their associated mobile terminals. The resulting backhaul traffic is considerably lower than that of existing cooperative multiuser detection strategies. Single-antenna interference cancellation techniques are employed to generate local estimates of the dominant interferers at each base station which are then combined with their independent received copies from other base stations resulting in more effective interference suppression. Since hard information bits or quantized log-likelihood ratios LLRs are transferred we investigate the effect of quantization of the LLR values with the objective of further reducing the backhaul traffic. Our findings show that schemes based on nonuniform quantization of the soft bits allow for reducing the backhaul to 1-2 exchanged bits coded bit. Copyright 2008 Shahid Khattak et al. This is an open access article distributed under the Creative Commons