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 Orthogonal Space-Time Block Codes in Vehicular Environments: Optimum Receiver Design and Performance Analysis | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 283060 9 pages doi 2009 283060 Research Article Orthogonal Space-Time Block Codes in Vehicular Environments Optimum Receiver Design and Performance Analysis Jun He and Pooi Yuen Kam Department of Electrical and Computer Engineering National University of Singapore Singapore S117576 Correspondence should be addressed to Jun He g0402558@ Received 21 April 2008 Accepted 23 March 2009 Recommended by Weidong Xiang We consider orthogonal space-time block codes OSTBC in vehicular environments where the channels are nonidentically distributed. It is shown that the nonidentical channel statistics lead to nonidentical channel estimation errors which consequently affect the performance and even the existing receiver structure ofOSTBC. We show that the conventional symbol-by-symbol SBS decoder of OSTBC is suboptimum in vehicular environments. A new optimum decoder is derived which can be simplified to a new SBS decoder under certain conditions. To the best of our knowledge our work here is the first to consider the optimum decoder for OSTBC in vehicular environments. Performance analysis and simulations are provided which show that our new decoder substantially outperforms the conventional decoder. Copyright 2009 J. He and P. Y. Kam. 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 Recently wireless vehicular communications for example vehicle-to-vehicle V2V and vehicle-to-infrastructure V2I communications have attracted more and more attention 1-5 as they show substantial potential to enhance the traffic safety 2 efficiency and information availability 3 . Several standards are being developed for vehicular communications such as IEEE wireless access of vehicular .
