Abstract
The most crucial factor which affects the performance of Multi-User Multi-cell Massive MIMO system is the pilot contamination. Pilot contamination is nothing but the interference caused by reuse of the pilot sequences to accommodate more number of users. Contaminated pilot results in poor channel estimation at the BS (Base Station). Addressing the problem of pilot contamination is the prime concern in Multicell Massive MIMO system. In the proposed scheme, instead of transmitting pilot sequence synchronously by all user terminals of all the cells, time shifted pilot sequence transmission in a non-overlapping time interval along with pilot sequence hopping is used at each coherence interval. Pilot sequence hopping causes random position of interfering user terminals. Therefore, changing the channel coefficient in each transmission slot, which results in better channel estimation as the group of interfering user terminals changes. At the BS, Mean Square Error (MSE) which is the measure of channel estimation and Pilot signal power to Interference power Ratio (PSIR) are calculated for less aggressive frequency reuse factor for the pilot sequences.
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