Massive Multi Input and Multi Output (M-MIMO) is the most prominent technology to improve the spectral and energy efficiency of future wireless systems by deploying multiple number of antennas at the base station. In this letter, we considered the impact of spatially correlation on massive MIMO downlink systems with achievable data rate in the block fading environment. The proposed schemes exploit the effective, achievable rates under perfect channel estimation and correlated channel environment. It has observed that the spatially correlation among the multiple antennas degrade the performance of multi antenna system. To do this, we provide widely used channel estimation techniques such as, MMSE and MRC for the evaluation of correlated channel scenario. The simulation results presented in MATLAB 2015b.

Capacity enhancement of downlink massive MIMO systems with spatial channel correlation

In this paper, a channel estimation (CE) and precoding scheme by using H-infinity (H-inf) criterion for mitigation of pilot contamination (PC) in Massive multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) systems is reconsidered. Firstly, different thresholds in H-inf CE and precoding are considered. Secondly, asymptotic analysis of the large system is applied to simplify the H-inf precoding, which shows that the complexity of an order of magnitude is reduced. Thirdly, approximate downlink achievable data rates per user are presented for different CE and precoding schemes, such as H-inf and minimum mean square error (MMSE) CE, MMSE, zero-forcing (ZF) and H-inf precoding. The analytic work shows that the proposed scheme can provide dual mitigation to the PC. That is, the H-inf CE mitigates the PC by adjusting its thresholds, and the H-inf precoding is utilized to suppress the PC by considering inter- cell interference. The numerical results show that the joint use of H-inf CE and H-inf precoding outperforms existing several schemes in terms of mitigation to the PC.

Joint Use of H-inf Criterion in Channel Estimation and Precoding to Mitigate Pilot Contamination in Massive MIMO Systems

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Joint Use of H-inf Criterion in Channel Estimation and Precoding to Mitigate Pilot Contamination in Massive MIMO Systems