ICTACT Journal on Communication Technology

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On Pilot Contamination in Massive Multiple-Input Multiple-Output System with least Square Method and Zero forcing Receiver


Affiliations
1 Department of Electronics and Communication Engineering, Sardar Vallabhbhai Patel Institute of Technology, India
2 Department of Electronics and Communication Engineering, Dharmsinh Desai University, India
     

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Massive Multiple-Input Multiple-Output (MIMO) wireless communications refers to use of large number of antennas at transmitter and receiver to enhance spectral and energy efficiency. However, its performance is limited by a problem known as pilot contamination. In this paper, we present a comprehensive overview of massive MIMO system and studied degradation in performance due to pilot contamination. To showcase such effects, we have implemented the channel estimation using Least Square (LS) method with random pilots and time shifted pilot scheme through simulations. In this study we have used zero forcing (ZF) receivers. We have also studied performance improvement in presence of pilot using MMSE receiver. Further improvement is achieved in this work by introducing precoding technique for massive MIMO systems.

Keywords

Massive MIMO, Channel Estimation, Pilot Contamination, MMSE, Precoding, ZF.
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  • On Pilot Contamination in Massive Multiple-Input Multiple-Output System with least Square Method and Zero forcing Receiver

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Authors

Joshi Poojaben Hirenkumar
Department of Electronics and Communication Engineering, Sardar Vallabhbhai Patel Institute of Technology, India
Jignesh N. Patel
Department of Electronics and Communication Engineering, Sardar Vallabhbhai Patel Institute of Technology, India
Hardip K. Shah
Department of Electronics and Communication Engineering, Dharmsinh Desai University, India

Abstract


Massive Multiple-Input Multiple-Output (MIMO) wireless communications refers to use of large number of antennas at transmitter and receiver to enhance spectral and energy efficiency. However, its performance is limited by a problem known as pilot contamination. In this paper, we present a comprehensive overview of massive MIMO system and studied degradation in performance due to pilot contamination. To showcase such effects, we have implemented the channel estimation using Least Square (LS) method with random pilots and time shifted pilot scheme through simulations. In this study we have used zero forcing (ZF) receivers. We have also studied performance improvement in presence of pilot using MMSE receiver. Further improvement is achieved in this work by introducing precoding technique for massive MIMO systems.

Keywords


Massive MIMO, Channel Estimation, Pilot Contamination, MMSE, Precoding, ZF.

References