tailieunhanh - Báo cáo hóa học: "Research Article Performance of Coded Systems with Generalized Selection Diversity in Nakagami Fading"

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 Performance of Coded Systems with Generalized Selection Diversity in Nakagami Fading | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 670503 5 pages doi 2008 670503 Research Article Performance of Coded Systems with Generalized Selection Diversity in Nakagami Fading Salam A. Zummo Electrical Engineering Department KingFahd University of Petroleum and Minerals KFUPM Dhahran 31261 Saudi Arabia Correspondence should be addressed to Salam A. Zummo zummo@ Received 22 April 2007 Revised 21 September 2007 Accepted 2 December 2007 Recommended by David Laurenson We investigate the performance of coded diversity systems employing generalized selection combining GSC over Nakagami fading channels. In particular we derive a numerical evaluation method for the cutoff rate of the GSC systems. In addition we derive a new union bound on the bit-error probability based on the code s transfer function. The proposed bound is general to any coding scheme with a known weight distribution such as convolutional and trellis codes. Results show that the new bound is tight to simulation results for wide ranges of diversity order Nakagami fading parameter and signal-to-noise ratio SNR . Copyright 2008 Salam A. Zummo. 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 Diversity is an effective method to mitigate multipath fading in wireless communication systems. Diversity improves the performance of communication systems by providing a receiver with M independently faded copies of the transmitted signal such that the probability that all these copies are in a deep fade is low. The diversity gain is obtained by combining the received copies at the receiver. The most general diversity combining scheme is the generalized selection combining GSC which provides a tradeoff between the high complexity of maximal-ratio combining