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 Residue Number System Arithmetic Assisted Coded Frequency-Hopped OFDM | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 263695 11 pages doi 2009 263695 Research Article Residue Number System Arithmetic Assisted Coded Frequency-Hopped OFDMA Dalin Zhu and Balasubramaniam Natarajan Department of Electrical Computer Engineering Kansas State University 2061 Rathbone Hall Manhattan KS 66506 USA Correspondence should be addressed to Dalin Zhu dalinz@ Received 31 July 2008 Revised 17 December 2008 Accepted 23 February 2009 Recommended by Lingyang Song We propose an RNS arithmetic-based FH pattern design approach that is well suited and easy to implement for practical OFDMA systems. The proposed FH scheme guarantees orthogonality among intracell users while randomizing the intercell interferences and providing frequency diversity gains. We present detailed construction procedures and performance analysis for both independent and cluster hopping scenarios. Using simulation results we demonstrate the gains due to frequency diversity and intercell interference diversity on the system bit error rate BER performance. Furthermore the BER performance gain is consistent across all cells unlike other FH pattern design schemes such as the Latin squares LSs- -based FH pattern design where wide performance variations are observed across cells. Copyright 2009 D. Zhu and B. Natarajan. 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 Orthogonal frequency division multiplexing OFDM has been widely accepted as an enabling technology for next generation wireless communication systems. In OFDM high-rate data streams can be broken down into a number of parallel lower-rate streams thereby avoiding the need for complex equalization. OFDM also forms the foundation for a multiple access scheme termed as orthogonal .
