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 Near-Optimum Detection with Low Complexity for Uplink Virtual MIMO Systems | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 307407 9 pages doi 2009 307407 Research Article Near-Optimum Detection with Low Complexity for Uplink Virtual MIMO Systems Sanhae Kim 1 2 Oh-Soon Shin 2 and Yoan Shin2 1FLYVO R D Center POSDATA Co. Ltd. Bundang-gu Seongnam-city Gyeonggi-do 463-775 South Korea 2 School of Electronic Engineering Soongsil University 1 Sangdo-dong Dongjak-gu Seoul 156-743 South Korea Correspondence should be addressed to Yoan Shin yashin@ Received 10 June 2008 Revised 4 December 2008 Accepted 9 January 2009 Recommended by Alister G. Burr In mobile worldwide interoperability for microwave access WiMAX or 3rd Generation partnership project long-term evolution 3GPP-LTE uplink virtual multiple input multiple output MIMO technology is adopted to perform spatial multiple access with two portable subscriber stations PSSs where each PSS has an antenna. As two PSSs transmit simultaneously on the same orthogonal frequency division multiple access OFDMA resource blocks the overall uplink capacity will be doubled. To employ this interesting technique with high performance most system venders demand the optimal maximum-likelihood detection MLD scheme in the radio access station RAS . However the optimal MLD is difficult to implement due to its explosive computational complexity. In this paper we propose two efficient MIMO decoding schemes that achieve near-optimum performance with low complexity for uplink virtual MIMO systems that have an iterative channel decoder using bit loglikelihood ratio LLR information. The simulation results show that the proposed schemes have almost the same block error rate BLER performance as that of the optimal MLD with only about and 28 computational complexity in terms of real multiplication when both PSSs transmit 16 quadrature amplitude modulation QAM signals and only about and for 64 QAM signals. Copyright 2009 Sanhae .
