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A novel design strategy has been proposed for multiple antenna elements in MIMO systems to maximize the system capacity. Firstly, one single antenna has been effectively designed by HFSS software. Since it is very difficult to optimize the MIMO antenna parameters using HFSS, the single antenna has been modeled by a magnetic current to be used in optimization procedure. The magnetic current distribution...
In this paper, we study the effect of antenna directivity on multi-input-multi-output (MIMO) antenna selection. A 4 orthogonal pattern antenna array platform at the receiver side associated with an antenna selection mechanism is used in this study. The performance of the proposed method is evaluated for two cases where the antenna selection switches are located either after or before Low Noise Amplifiers...
In this paper, we find the optimum soft antenna selection (SAS) which maximizes the mutual information for the multiple-input multiple-output (MIMO) spatial multiplexing transmission in an interference channel. In this optimization problem, a 2-Dimensional (2D) directive interference model is used. We first find an optimal solution for SAS without applying any constraint on it and then propose a sub-optimal...
Significant capacity improvements are possible when the multiple antennas are employed at both the transmitter and receiver. However, the application of multiple antenna systems is restricted by increasing of the cost and complexity of radio frequency (RF) subsystem. The authors in J. Ahmadi-Shokouh et al. (2006) presented a novel structure which not only overcomes the aforementioned limitation but...
We propose a novel dimensionality metric for multi-antenna systems. Being SNR- independent, the metric is suitable for multipath richness comparison of several scenarios having their channel matrices Frobenius-normalized. The metric is based on the equivalence between the given singular values distribution of the normalized channel matrix and those of equi-contribution parallel sub-channels. Under...
In this paper, we examine the improvements in the performance of a VBLAST-based multiple-input multiple-output (MIMO) system equipped with a recently proposed smart passive receive antenna selection (SPRAS) technique and compare it with the other existing antenna selection schemes. The simulation results show the superiority of SPRAS compared to the other selection techniques. Specifically, when the...
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