We consider a point-to-point mm-wave massive multiple-input multiple-output hybrid beamforming system where the transmitter is impaired with in-phase and quadrature-phase imbalance (IQI). We propose a novel channel estimation and IQI parameter estimation algorithm which first estimates the true sparse channel parameters using which it then estimates the IQI parameters. We show that the transmitter IQI limits the spectral efficiency of hybrid beamforming systems at high signal-to-noise ratio irrespective of the choice of hybrid precoder/combiner. We also propose a novel IQI symbol-level pre-compensation scheme at the transmitter which modifies the input symbol vector to the transmit radio frequency (RF) chains in such a way that the symbol vector received at the output of the RF chains is free from any IQI. Analysis and simulations confirm the effectiveness of the proposed IQI pre-compensation technique.
Transmitter IQ Imbalance Pre-Compensation for mm-wave Hybrid Beamforming Systems
01.05.2020
164949 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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