On Limits of Wireless Communications in a Fading Environment when UsingMultiple Antennas
Wireless Personal Communications: An International Journal
Antenna Theory: Analysis and Design
Antenna Theory: Analysis and Design
Reduced-complexity transmit/receive-diversity systems
IEEE Transactions on Signal Processing
Receive antenna selection for MIMO spatial multiplexing: theory and algorithms
IEEE Transactions on Signal Processing
Variable-phase-shift-based RF-baseband codesign for MIMO antenna selection
IEEE Transactions on Signal Processing
Mutual coupling in MIMO wireless systems: a rigorous network theory analysis
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
A stochastic MIMO radio channel model with experimental validation
IEEE Journal on Selected Areas in Communications
The evolution to 4G cellular systems: LTE-Advanced
Physical Communication
Wireless Personal Communications: An International Journal
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Physical size limitations in user equipment may force multiple antennas to be spaced closely, and this generates a considerable amount of mutual coupling between antenna elements whose effect cannot be neglected. Thus, the design and deployment of antenna selection schemes appropriate for next generation wireless standards such as 3GPP long term evolution (LTE) and LTE advanced needs to take these practical implementation issues into account. In this paper, we consider multiple-input multipleoutput (MIMO) systems where antenna elements are placed side by side in a limited-size linear array, and we examine the performance of some typical antenna selection approaches in such systems and under various scenarios of antenna spacing and mutual coupling. These antenna selection schemes range from the conventional hard selection method where only part of the antennas are active, to some newly proposed methods where all the antennas are used, which are categorized as soft selection. For the cases we consider, our results indicate that, given the presence of mutual coupling, soft selection can always achieve superior performance as compared to hard selection, and the interelement spacing is closely related to the effectiveness of antenna selection. Our work further reveals that, when the effect ofmutual coupling is concerned, it is still possible to achieve better spectral efficiency by placing a few more than necessary antenna elements in user equipment and applying an appropriate antenna selection approach than plainly implementing the conventional MIMO system without antenna selection.