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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: Flexible Transmission Scheme for 4G Wireless Systems with Multiple Antennas | EURASIP Journal on Wireless Communications and Networking 2005 3 308-322 2005 Francois Horlin et al. Flexible Transmission Scheme for 4G Wireless Systems with Multiple Antennas Francois Horlin Wireless Research Interuniversity Micro-Electronics Center IMEC Kapeldreef 75 B-3001 Leuven Belgium Email francois.horlin@imec.be Frederik Petre Wireless Research Interuniversity Micro-Electronics Center IMEC Kapeldreef 75 B-3001 Leuven Belgium Email petre@imec.be Eduardo Lopez-Estraviz Wireless Research Interuniversity Micro-Electronics Center IMEC Kapeldreef 75 B-3001 Leuven Belgium Email lopezest@imec.be Frederik Naessens Wireless Research Interuniversity Micro-Electronics Center IMEC Kapeldreef 75 B-3001 Leuven Belgium Email naessen@imec.be Liesbet Van der Perre Wireless Research Interuniversity Micro-Electronics Center IMEC Kapeldreef 75 B-3001 Leuven Belgium Email vdperre@imec.be Received 15 October 2004 Revised 11 May 2005 New air interfaces are currently being developed to meet the high requirements of the emerging wireless communication systems. In this context the combinations of the multicarrier MC and spread-spectrum SS technologies are promising candidates. In this paper we propose a generic transmission scheme that allows to instantiate all the combinations of orthogonal frequencydivision multiplexing OFDM and cyclic-prefixed single-carrier SC modulations with direct-sequence code-division multiple access DS-CDMA . The generic transmission scheme is extended to integrate the space-division multiplexing SDM and the orthogonal space-time block coding STBC . Based on a generalized matrix model the linear frequency-domain minimum mean square error MMSE joint detector is derived. A mode selection strategy for up- and downlink is advised that efficiently trades off the cost of the mobile terminal and the achieved performance of a high-mobility cellular system. It is demonstrated that an adaptive transceiver that supports the proposed communication modes is necessary .
