Multi-Layer Precoding: A Potential Solution for Full-Dimensional Massive MIMO Systems

Ahmed Alkhateeb, Geert Leus, Robert W. Heath

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

Massive MIMO systems achieve high sum spectral efficiency by simultaneously serving large numbers of users. In time division duplexing systems, however, the reuse of uplink training pilots among cells results in channel estimation errors, which causes downlink inter-cell interference. Handling this interference is challenging due to the large channel dimensionality and the high complexity associated with implementing large precoding/combining matrices. In this paper, we propose multi-layer precoding to enable efficient and low-complexity operation in full-dimensional massive MIMO, where a large number of antennas are used in two dimensions. In multi-layer precoding, the precoding matrix of each base station is written as a product of a number of precoding matrices. Multi-layer precoding: 1) leverages the directional characteristics of large-scale MIMO channels to manage inter-cell interference with low channel knowledge requirements and 2) allows for an efficient implementation using hybrid analog/digital architectures. We present and analyze a specific multi-layer precoding design for full-dimensional massive MIMO systems. The asymptotic optimality of the proposed design is then proved for some special yet important channels. Numerical simulations verify the analytical results and illustrate the potential gains of multi-layer precoding compared with other multi-cell precoding solutions.

Original languageEnglish (US)
Article number7954699
Pages (from-to)5810-5824
Number of pages15
JournalIEEE Transactions on Wireless Communications
Volume16
Issue number9
DOIs
StatePublished - Sep 1 2017
Externally publishedYes

Keywords

  • full-dimensional MIMO
  • massive MIMO
  • Multi-layer precoding
  • pilot decontamination

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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