tailieunhanh - Báo cáo hóa học: " Research Article Combined Distributed Turbo Coding and Space Frequency Block Coding Techniques"

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 Combined Distributed Turbo Coding and Space Frequency Block Coding Techniques | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 327041 14 pages doi 2010 327041 Research Article Combined Distributed Turbo Coding and Space Frequency Block Coding Techniques 1 1 2 2 1 2 1 ếv im ỉi ể 2 Bota s. A. roigar At Silva S. icodoro IVA. r. Stef A. rvAoco A. voios and A. AaAAAeiro 1 Communications Department Technical University of Cluj Napoca 400027 Cluj Napoca Romania 2Institute of Telecommunications University ofAveiro 3800-193 Aveiro Portugal Correspondence should be addressed to V. Bota Received 30 March 2010 Revised 26 July 2010 Accepted 7 November 2010 Academic Editor Mohamed Hossam Ahmed Copyright 2010 V. Bota 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. The distributed space-time frequency coding and distributed channel turbo coding used independently represent two cooperative techniques that can provide increased throughput and spectral efficiency at an imposed maximum Bit Error Rate BER and delay required from the new generation of cellular networks. This paper proposes two cooperative algorithms that employ jointly the two types of techniques analyzes their BER and spectral efficiency performances versus the qualities of the channels involved and presents some conclusions regarding the adaptive employment of these algorithms. 1. Introduction Most of the services that should be provided by future wireless networks require low or very low BER and delay values and high data rates. The cooperative transmission techniques represent one of the most promising solutions in wireless networks for provisioning the increased capacity extended coverage and improved fairness 1-3 required by such services. They could ensure low BER while still inserting limited transmission delays and also .