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Superimposed Pilots are Superior for Mitigating Pilot Contamination in Massive MIMO: Part II - Performance Analysis and Hybrid System Design | | Karthik Upadhya
; Sergiy A. Vorobyov
; Mikko Vehkapera
; | | Date: |
14 Jun 2016 | | Abstract: | In this part of the two part paper, the claim in Part I, that superimposed
pilots are superior at mitigating pilot contamination in massive multiple-input
multiple-output (MIMO) systems, is bolstered through additional performance
metrics such as mean-squared error (MSE) and downlink signal-to-interference
plus noise ratio (SINR). For a system employing superimposed pilots, it is
shown that the MSE of the channel estimate diminishes with increasing number of
antennas at the base station (BS), with the MSE achieving its Cramer-Rao lower
bound asymptotically. The downlink (DL) SINR is also shown to increase without
bound at a rate proportional to the square root of the number of antennas at
the BS. Furthermore, we extend the concept of the hybrid system and propose a
framework for partitioning users into those that employ superimposed pilots and
to those that employ time-multiplexed pilots and data. The superiority in the
DL SINR performance of the channel estimator based on superimposed pilots and
the higher throughput of the hybrid system are demonstrated by means of
simulations. | | Source: | arXiv, 1606.4476 | | Services: | Forum | Review | PDF | Favorites | |
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