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 Super-Orthogonal Block Codes with Multichannel Equalisation and OFDM in Frequency Selective Fading | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 153846 10 pages doi 2010 153846 Research Article Super-Orthogonal Block Codes with Multichannel Equalisation and OFDM in Frequency Selective Fading O. Sokoya and B. T. Maharaj Department of Electrical Electronic and Computer Engineering University of Pretoria Pretoria 0002 South Africa Correspondence should be addressed to O. Sokoya darryso@ Received 25 January 2010 Accepted 21 June 2010 Academic Editor Stefan Kaiser Copyright 2010 O. Sokoya and B. T. Maharaj. 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. Super-orthogonal block codes in space-time domain . Super-orthogonal space-time trellis codes SOSTTCs were initially designed for frequency nonselective FNS channels but in frequency selective FS channels these super-orthogonal block codes suffer performance degradation due to signal interference. To combat the effects of signal interference caused by the frequency selectivity of the fading channel the authors employ two methods in this paper namely multichannel equalization ME and orthogonal frequency division multiplexing OFDM . In spite of the increase complexity of the SOSTTC-ME optimum receiver design scheme the SOSTTC-ME scheme maintains the same diversity advantage as compared to the SOSTTC scheme in FNS channel. In OFDM environments the authors consider two forms of the super-orthogonal block codes namely super-orthogonal space-time trellis-coded OFDM and super-orthogonal space-frequency trellis-coded OFDM. The simulation results reveal that super-orthogonal space-frequency trellis-coded OFDM outperforms super-orthogonal space-time trellis-coded OFDM under various channel delay spreads. 1. Introduction The use of channel codes in combination with multiple transmit
