Abstract
This paper describes investigations into the antenna mutual coupling (MC) effect on channel estimation and capacity of a multiple-input multiple-output (MIMO) wireless communication system. The presented investigations close the gap existing in the previous works which assessed the effect of mutual coupling on MIMO capacity under the assumption of availability of perfect channel state information (CSI) at the receiver. The new approach assumes that the perfect CSI is not available due to channel estimation errors. The investigations are carried out for different spacing between array antenna elements producing a varying effect of mutual coupling on the channel estimation and the resulting MIMO channel capacity.
Highlights
It has been shown in recent works that a wireless communication system can achieve an increased capacity by using multiple element antennas at transmitter and receiver by applying a suitable signal processing scheme [1]
Equations (45) and (55) are used to model the multiple-input multiple-output (MIMO) channel. Both cases when mutual coupling effects are taken into account or disregarded are considered
These results show that when the antenna element spacing is within 0.2λ and 0.4λ, the mutual coupling helps to increase the channel capacity when a perfect channel state information (CSI) is assumed to be available at the receiver
Summary
It has been shown in recent works that a wireless communication system can achieve an increased capacity by using multiple element antennas at transmitter and receiver by applying a suitable signal processing scheme [1]. In [18,19,20], it has been shown that if the training-based SLS or MMSE channel estimation methods are used to estimate CSI, their performance can be improved when the channels exhibit a higher spatial correlation level. According to [9,10,11,12,13,14,15], when the antenna element spacing is within 0.2λ and 0.4λ, the mutual coupling can decrease the spatial correlation level In such cases, the accuracy of training-based channel estimation methods is compromised. From these considerations one can see a tradeoff between the accuracy of channel estimation and the resulting capacity when the MIMO system operates under mutual coupling conditions.
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