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 language | English |
|---|---|
| Pages (from-to) | 778-781 |
| Number of pages | 4 |
| Journal | IEEE Wireless Communications Letters |
| Volume | 6 |
| Issue number | 6 |
| DOIs | |
| State | Published - Dec 2017 |
Keywords
- IQ imbalance
- OFDM
- Reciprocity of channel
- TDD
- V massive MIMO
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