Performance of Multi-Cell Massive MIMO Systems With Interference Decoding

doi:10.1109/TCOMM.2019.2955965

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Performance of Multi-Cell Massive MIMO Systems With Interference Decoding

2020-02-01

Meysam Shahrbaf Motlagh *

Subhajit Majhi

Patrick Mitran

DOI：10.1109/TCOMM.2019.2955965

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Abstract

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We consider a multi-cell massive MIMO system where a time-division duplex protocol is used to estimate the channel state information via uplink pilots. When maximum ratio combining (MRC) is used at the BSs, the re-use of pilots across cells causes the pilot contamination effect which yields interference components that do not vanish as the number of base-station (BS) antennas M -> infinity. When treating interference as noise (TIN), this phenomenon limits the performance of multi-cell massive MIMO systems. In this paper, we analyze more advanced schemes based on simultaneous unique decoding (SD) as well as simultaneous non-unique decoding (SND) of the interference that can provide unbounded rate as M -> infinity. We also establish a worst-case uncorrelated noise technique for multiple-access channels to derive achievable rate expressions for finite M. Furthermore, we study a much simpler subset of SND (called S-SND) which provides a lower bound to SND and achieves unbounded rate as M -> infinity, and also outperforms SD for finite M. For the special cases of two-cell and three-cell systems, using a maximum symmetric rate allocation policy we compare the performance of different interference decoding schemes with that of TIN. Finally, we numerically illustrate the improved performance of the proposed schemes.

Keywords:

Massive MIMO

pilot contamination

simultaneous unique

non-unique decoding (SD/SND)

treating interference as noise (TIN)

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