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 Capacity Versus Bit Error Rate Trade-Off in the DVB-S2 Forward Link | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 14798 10 pages doi 2007 14798 Research Article Capacity Versus Bit Error Rate Trade-Off in the DVB-S2 Forward Link Matteo Berioli Christian Kissling and Remi Lapeyre German Aerospace Center DLR Institute of Communications and Navigation Oberpfaffenhofen 82234 Wessling Germany Received 5 October 2006 Accepted 12 March 2007 Recommended by Ray E. Sheriff The paper presents an approach to optimize the use of satellite capacity in DVB-S2 forward links. By reducing the so-called safety margins in the adaptive coding and modulation technique it is possible to increase the spectral efficiency at expenses of an increased BER on the transmission. The work shows how a system can be tuned to operate at different degrees of this trade-off and also the performance which can be achieved in terms of BER PER spectral efficiency and interarrival duration strength of the error bursts. The paper also describes how a Markov chain can be used to model the ModCod transitions in a DVB-S2 system and it presents results for the calculation of the transition probabilities in two cases. Copyright 2007 Matteo Berioli 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. 1. INTRODUCTION The original DVB-S standard dates back to 1995 and was intended for delivery of broadcasting services the underlying transport stream of DVB-S was defined to be MPEG-2. DVB-S2 1 is the second generation of the DVB-S standard and comprises a variety of new features. It can be used for provision of HDTV high definition television but it also allows for transportation of different multimedia streams such as for example internet traffic audio and video streaming and file transfers with support of different input stream formats such as IP
