Flexible Transmission Scheme for 4G Wireless Systems with Multiple Antennas
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lexible Transmission Scheme for 4G Wireless Systems with Multiple Antennas Franc¸ois Horlin Wireless Research, Interuniversity Micro-Electronics Center (IMEC), Kapeldreef 75, B-3001 Leuven, Belgium Email: [email protected]
Frederik Petre´ Wireless Research, Interuniversity Micro-Electronics Center (IMEC), Kapeldreef 75, B-3001 Leuven, Belgium Email: [email protected]
Eduardo Lopez-Estraviz Wireless Research, Interuniversity Micro-Electronics Center (IMEC), Kapeldreef 75, B-3001 Leuven, Belgium Email: [email protected]
Frederik Naessens Wireless Research, Interuniversity Micro-Electronics Center (IMEC), Kapeldreef 75, B-3001 Leuven, Belgium Email: [email protected]
Liesbet Van der Perre Wireless Research, Interuniversity Micro-Electronics Center (IMEC), Kapeldreef 75, B-3001 Leuven, Belgium Email: [email protected] 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 to track the changing communication conditions. Keywords and phrases: code-division multiple access, OFDM, cyclic-prefix single carrier, space-division multiplexing, space-time block coding, joint detection.
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INTRODUCTION
Because of the limited frequency bandwidth, on the one hand, and the potential limited power of terminal stations, on the other hand, spectral and power efficiency of future systems should be as high as possible. New air interfaces need to be developed to meet the new system requireThis 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.
ments. Combinations of the multicarrier (MC) and spreadspectrum (SS) modulations, named multicarrier spreadspectrum techniques, could be interesting candidates. They might benefit from the main advantages of both MC and SS schemes such as high spectral efficiency, multiple-access capabilities, narrowband interference rejection, simple one-tap equalization, and so forth. Cellular systems of the t
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