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In this paper, we investigate a switching scheme involving antenna selection and transmit beamforming modes for a multiple input multiple output (MIMO) system operating over a varying Rician channel. It is shown that that beamforming outperforms antenna selection when line of sight (LOS) component dominates the channel. Also transmit beamforming is superior over antenna selection at high values of...
This paper reports on the performance of the space time block coded MIMO system with spatial redundancy which is accomplished using a larger than required numbers of antennas. The proposed scheme guides the transmitted power onto the RF branches with higher gain coefficients. The carried out theoretical analysis shows that the scheme can achieve higher channel capacity and lower symbol error rate...
In this paper, the performances of two MIMO channel estimation methods, the scaled least square (SLS) and the minimum mean-square error (MMSE), have been investigated using a two-ring double-bounce channel model representing a signal scattering environment. It has been shown that both SLS and MMSE methods offer a better performance at higher values of the Rician factor K, meaning that the presence...
This paper is concerned with the optimal transmission/power allocation scheme for a MIMO system employing a uniform circular array (UCA) antenna at the transmitter and a uniform linear array (ULA) antenna at the receiver. Investigations include mutual coupling (MC) effects in the UCA. By applying the transmitting mutual impedances, closed-form expressions for the spatial fading correlation (SFC) function...
This paper is concerned with a study of an optimal transmission scheme in a single-user MIMO system influenced by an antenna mutual coupling effect. Using the transmitting and receiving mutual impedances, a "coupled power" concept is introduced. This concept is applied to work out an optimal transmission scheme when a non-negligible mutual coupling between antenna elements exists. Numerical...
The effect of antenna mutual coupling on the channel estimation for MIMO- OFDM system is rigorously studied. Numerical results show that we cannot ignore the influence of antenna mutual coupling on channel estimation. Antenna mutual coupling in general increases channel estimation error but reduces symbol error rate performance.
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