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Hybrid Beamforming with Time Delay Compensation for Millimeter Wave MIMO Frequency Selective Channels

Wang, G. ,  Sun, J. ,  Ascheid, G.
Book Title:
Proceedings of IEEE Vehicular Technology Conference (VTC-Spring)
p.p. 1-6
May. 2016


The fading channel in mmWave communications has a very high chance to be frequency selective owing to the large transmission bandwidth. To overcome the frequency selectivity we propose a novel method, namely RF beamforming with time delay compensation. Simultaneously, baseband precoder at the transmitter side and the combiner at the receiver side are employed to maximize the capacity of the system. For effectively flattening the channel by beamforming on both sides, it is necessary to separate the individual rays. Motivated by achieving the best case beam separation, a signal-to-interference ratio (SIR) constrained capacity maximization algorithm is proposed in this paper. We also study the influence of the parameters such as the number of antennas at the transmitter side and the SIR threshold on the capacity and the system performance. Finally, the proposed method is validated by providing numerical examples by means of simulation.