  Massive multiple-input multiple-output is a very important technology for
future fifth-generation systems. However, massive massive multiple input
multiple output systems are still limited because of pilot contamination,
impacting the data rate due to the non-orthogonality of pilot sequences
transmitted by users in the same cell to the neighboring cells. We propose a
channel estimation with complete knowledge of large-scale fading by using an
orthogonal pilot reuse sequence to eliminate PC in edge users with poor channel
quality based on the estimation of large-scale fading and performance analysis
of maximum ratio transmission and zero forcing precoding methods. We derived
the lower bounds on the achievable downlink DR and signal-to-interference noise
ratio based on assigning PRS to a user grouping that mitigated this problem
when the number of antenna elements approaches infinity The simulation results
showed that a high DR can be achieved due to better channel estimation and
reduced performance loss
