tailieunhanh - Báo cáo hóa học: "Research Article M-PSK Cooperative Trellis Codes for Coordinate Interleaved Coded 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 M-PSK Cooperative Trellis Codes for Coordinate Interleaved Coded Cooperation | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 367097 11 pages doi 2009 367097 Research Article M-PSK Cooperative Trellis Codes for Coordinate Interleaved Coded Cooperation Ozgur Oruc and Umit Aygolii Faculty of Electrical and Electronics Engineering Istanbul Technical University Maslak 34469 Istanbul Turkey Correspondence should be addressed to Umit Aygolu aygolu@ Received 31 October 2008 Revised 2 March 2009 Accepted 29 May 2009 Recommended by Xavier Mestre M-PSK cooperative trellis codes are proposed for two-user coordinate interleaved coded cooperation operating over quasistatic Rayleigh fading channels. The coding approach properly combines cooperative and modulation diversity techniques to take their full advantage. Two selective cooperation schemes are considered related to whether users know the cooperation status or not. Upper bounds on the pairwise error probability of the considered schemes are derived for each cooperation case which lead to new code design criteria. Based on these criteria 4- 8- 16-state QPSK and 8- 16-state 8PSK cooperative trellis codes are obtained by means of exhaustive computer search. The error performance evaluation of the new codes by computer simulations shows that they outperform the corresponding best space-time codes used in cooperation with coordinate interleaving. Copyright 2009 0. Oruc and U. Aygolu. 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. 1. Introduction Spatial diversity techniques are extensively used to enhance wireless system performance against deterioration caused by fading since it needs neither extra transmission time nor bandwidth expansion. The link performance is enhanced by conveying the information signal to the destination over more than one ideally .