Channel compensation for reciprocal TDD massive MIMO-OFDM with IQ imbalance

Yan Liang, Hongbin Li, Fei Li, Rongfang Song, Lihua Yang

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Massive multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems are sensitive to in-phase and quadrature (IQ) imbalances, which destroys the reciprocity of time-division duplex (TDD) uplink/downlink channels with potentially large performance degradation. In this letter, we investigate the compensation of channel reciprocity for TDD massive MIMO-OFDM systems in the presence of IQ imbalances at both the transmitter and receiver. A frequency-domain compensation scheme is proposed, which uses compensation matrices to precode uplink and downlink transmissions. By disassembling the effective channel model into pairs of mirror subcarriers and utilizing block matrix inversion, the compensation matrices can be calculated with a complexity that is linear in the number of antennas at the base station and mobile station. Simulations verify the effectiveness of the proposed scheme.

Original languageEnglish
Pages (from-to)778-781
Number of pages4
JournalIEEE Wireless Communications Letters
Volume6
Issue number6
DOIs
StatePublished - Dec 2017

Keywords

  • IQ imbalance
  • OFDM
  • Reciprocity of channel
  • TDD
  • V massive MIMO

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