Pilot Power Allocation Through User Grouping in Multi-Cell Massive MIMO Systems

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

57 Scopus Citations
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Author(s)

  • Pei Liu
  • Shi Jin
  • Tao Jiang
  • Qi Zhang
  • Michail Matthaiou

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number7801046
Pages (from-to)1561-1574
Journal / PublicationIEEE Transactions on Communications
Volume65
Issue number4
Publication statusPublished - Apr 2017

Abstract

In this paper, we propose a relative channel estimation error (RCEE) metric, and derive closed-form expressions for its expectation Exprcee and the achievable uplink rate holding for any number of base station antennas M, with the least squares (LS) and minimum mean squared error (MMSE) methods. It is found that RCEE and Exprcee converge to the same constant value when M → ∞, which renders the pilot power allocation (PPA) substantially simplified and a PPA algorithm is proposed to minimize the average Exprcee per user under a total pilot power budget P in multi-cell massive multipleinput multiple-output systems. Numerical results show that the PPA algorithm brings considerable gains for the LS estimation compared with equal PPA (EPPA), while the gains are significant only with large frequency reuse factor (FRF) for the MMSE estimation. Moreover, for large FRF and large P, the performance of the LS approaches to that of the MMSE. Besides, a scheduling strategy is proposed to allocate pilot power in the whole system, which can approach the optimal performance. For the achievable uplink rate, the PPA scheme and improves the minimum achievable uplink rate compared with the EPPA scheme..

Research Area(s)

  • Massive multiple-input multiple-output (MIMO), pilot power allocation, relative channel estimation error, achievable uplink rate, LARGE ANTENNA-ARRAYS, LARGE-SCALE MIMO, CHANNEL ESTIMATION, UPLINK, EFFICIENCY, RECEIVER

Citation Format(s)

Pilot Power Allocation Through User Grouping in Multi-Cell Massive MIMO Systems. / Liu, Pei; Jin, Shi; Jiang, Tao; Zhang, Qi; Matthaiou, Michail.

In: IEEE Transactions on Communications, Vol. 65, No. 4, 7801046, 04.2017, p. 1561-1574.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review