Pilot Contamination Elimination in Massive MIMO Systems with an Improved Time-Shifted Scheme

更新时间:2023-05-28

【摘要】Pilot contamination can bring up a grave impairment in the performance of massive multiple-input multiple-output( MIMO) systems. In this paper,an improved time-shifted pilot scheme is proposed to reduce the pilot contamination,where orthogonal pilots are employed in the same group to eliminate the residual intragroup interference existing in the original time-shifted pilot scheme. Meanwhile,the rigorous closed-form expressions of both downlink and uplink transmission rates with a finite number of antennas are derived,and it is shown that the intra-group interference can be completely eliminated by the proposed scheme. Simulation results demonstrate that both downlink and uplink transmission rates are significantly improved by employing the proposed scheme.

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