Downlink Pilot Reduction for Massive MIMO Systems via Compressed Sensing

Jun Won Choi, Byonghyo Shim, Seok Ho Chang

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

This letter addresses a problem of downlink pilot allocation for massive multiple-input multiple-output (MIMO) systems. When a massive MIMO is employed in frequency division duplex (FDD) systems, significant amount of radio resources are dedicated to the transmission of downlink pilots. Such huge pilot overhead leads to a substantial loss in the maximum data throughput, which motivates us to reduce the number of pilots. In this letter, we propose a pilot reduction strategy based on compressed sensing techniques for orthogonal frequency division multiplexing systems. The pilots are randomly located in a low density manner over the time and frequency domain. To estimate the channels with such low density pilots, we propose a novel sparse channel estimation technique that exploits the common support of the consecutive channel impulse responses over the certain time duration. The evaluation shows that for a massive MIMO with 128 antennas, the proposed scheme achieves significant reduction of pilot overhead, while maintaining good channel estimation performance.

Original languageEnglish
Article number7229286
Pages (from-to)1889-1892
Number of pages4
JournalIEEE Communications Letters
Volume19
Issue number11
DOIs
Publication statusPublished - 2015 Nov 1
Externally publishedYes

Fingerprint

Compressed sensing
Compressed Sensing
Multiple-input multiple-output (MIMO) Systems
Channel Estimation
Channel estimation
Multiple-input multiple-output (MIMO)
Impulse Response
Impulse response
Orthogonal Frequency Division multiplexing (OFDM)
Orthogonal frequency division multiplexing
Frequency Domain
Antenna
Time Domain
Consecutive
Division
Throughput
Antennas
Resources
Evaluation
Estimate

Keywords

  • Channel estimation
  • compressed sensing
  • downlink pilot allocation
  • massive multiple-input multiple-output (MIMO)
  • Orthogonal frequency division multiplexing (OFDM)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Science Applications
  • Modelling and Simulation

Cite this

Downlink Pilot Reduction for Massive MIMO Systems via Compressed Sensing. / Choi, Jun Won; Shim, Byonghyo; Chang, Seok Ho.

In: IEEE Communications Letters, Vol. 19, No. 11, 7229286, 01.11.2015, p. 1889-1892.

Research output: Contribution to journalArticle

Choi, Jun Won ; Shim, Byonghyo ; Chang, Seok Ho. / Downlink Pilot Reduction for Massive MIMO Systems via Compressed Sensing. In: IEEE Communications Letters. 2015 ; Vol. 19, No. 11. pp. 1889-1892.
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