TAILIEUCHUNG - Báo cáo hóa học: "Research Article Blind Separation of Two Users Based on User Delays and Optimal Pulse-Shape Design"

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 Blind Separation of Two Users Based on User Delays and Optimal Pulse-Shape Design | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 939340 12 pages doi 2010 939340 Research Article Blind Separation of Two Users Based on User Delays and Optimal Pulse-Shape Design Xin Liu 1 Athina P. Petropulu 1 H. Vincent Poor 2 and Visa Koivunen3 1 Electrical and Computer Engineering Department Drexel University 19104-2875 PA USA 2 School of Engineering and Applied Science Princeton University Princeton NJ 08544 USA 3 Signal Processing Laboratory Aalto University 00076 Aalto Finland Correspondence should be addressed to Xin Liu xl52@ Received 4 December 2009 Accepted 9 June 2010 Academic Editor Yan Xin Copyright 2010 Xin Liu et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. A wireless network is considered in which two spatially distributed users transmit narrow-band signals simultaneously over the same channel using the same power. User separation is achieved by oversampling the received signal and formulating a virtual multiple-input multiple-output MIMO system based on the resulting polyphase components. Because of oversampling high correlations can occur between the columns of the virtual MIMO system matrix which can be detrimental to user separation. A novel pulse-shape waveform design is proposed that results in low correlation between the columns of the system matrix while it exploits all available bandwidth as dictated by a spectral mask. It is also shown that the use of successive interference cancelation in combination with blind source separation further improves the separation performance. 1. Introduction We consider the problem of multiuser separation in wireless networks via approaches that do not use scheduling. This problem is of interest for example when traffic is generated in a bursty fashion in .

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