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| Ergodic Capacity Evaluation of MIMO Channel in Wireless Communication System
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Nnaji, Genevieve Ada, Nwabueze, Christopher A., Iloh, Johnpaul I.
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Abstract:
This paper considered ergodic capacity evaluation of multiple-input multiple-output (MIMO) channel in wireless communication system. Three main parameters of interest for the channels are the signal power expressed in terms of signal to noise ratio (SNR) in dB, the spacing between antennas, and the number of antennas. A MATLAB C code was developed to examined the performance of the proposed system considering channel capacity in terms of cumulative distribution function (CDF) to determine the probabilistic effect of increasing number of antennas at BS and MS on the rate of data transfer and ergodic capacity performance of the channel when different BS antennas transmits to MS different antennas. Simulation results revealed that the ergodic capacity cumulative distribution function (CDF), when SNR was fixed at 10 dB, 15 dB, 20 dB, 25 dB, and 30 dB while varying the number of antennas at base station (BS), M and mobile station (MS), N, resulted in ergodic capacity increase as the number of antennas increase with CDF (or probability) of 100%. The ergodic capacities for different multiple antenna elements configurations showed that increasing the number of antenna arrays from conventional MIMO to massive MIMO by means of antenna selection method can increase the rate (speed) at which information are transmitted over wireless channel. Besides, by making the BS antennas very much larger than the MS antennas provides much more capacity such that at M = 128 and N = 20, the capacity achieved was 197 bps/Hz.
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