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Joint Synchronization, Phase Noise and Compressive Channel Estimation in Hybrid Frequency-Selective mmWave MIMO Systems
Javier Rodriguez-Fernandez, Nuria Gonzalez-Prelcic · 2019-06-06 · via eess.SP updates on arXiv.org

The large beamforming gain used to operate at millimeter wave (mmWave) frequencies requires obtaining channel information to configure hybrid antenna arrays. Previously proposed wideband channel estimation strategies, however, assume perfect time-frequency synchronization and neglect phase noise, making these approaches impractical. Consequently, achieving time-frequency synchronization between transmitter and receiver and correcting for phase noise (PN) as the channel is estimated, is the greatest challenge yet to be solved in order to configure hybrid precoders and combiners in practical settings. In this paper, building upon our prior work, we find the Maximum A Posteriori (MAP) solution to the joint problem of timing offset (TO), carrier frequency offset (CFO), PN and compressive channel estimation for broadband mmWave MIMO systems with hybrid architectures. Simulation results show that, using significantly less training symbols than in the beam training protocol in the 5G New Radio communications standard, joint synchronization and channel estimation at the low SNR regime can be achieved, and near-optimum data rates can be attained.

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