Title :
Graph Coloring Based Pilot Allocation to Mitigate Pilot Contamination for Multi-Cell Massive MIMO Systems
Author :
Xudong Zhu ; Linglong Dai ; Zhaocheng Wang
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
A massive multiple-input multiple-output (MIMO) system, which utilizes a large number of base station (BS) antennas to serve a set of users, suffers from pilot contamination due to the inter-cell interference (ICI). In this letter, a graph coloring based pilot allocation (GC-PA) scheme is proposed to mitigate pilot contamination for multi-cell massive MIMO systems. Specifically, by exploiting the large-scale characteristics of fading channels, an interference graph is firstly constructed to describe the potential ICI relationship of all users. Then, with the limited pilot resource, the proposed GC-PA scheme aims to mitigate the potential ICI by efficiently allocating pilots among users in the interference graph. The performance gain of the proposed scheme is verified by simulations.
Keywords :
MIMO communication; antenna arrays; cellular radio; contamination; fading channels; graph colouring; radiofrequency interference; BS antennas; GC-PA scheme; ICI; base station; fading channels; graph coloring based pilot allocation; intercell interference; interference graph; multicell massive MIMO systems; multiple-input multiple-output system; pilot contamination; Antennas; Contamination; Fading; Interference; MIMO; Resource management; Uplink; Massive multiple-input multiple-output (MIMO); graph coloring; pilot allocation; pilot contamination;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2015.2471304
