mmwave channel estimation

Wideband Channel Estimation for Hybrid Beamforming Millimeter Wave Communication Systems with Low-Resolution ADCs

Millimeter wave (mmWave) communications is a promising technology to increase data rates to users.  In mmWave communications, large antenna arrays are needed to form directional beams to overcome the high pathloss. Power consumption becomes a significant challenge.  By reducing the number of RF chains and adapting the analog-to-digital converter (ADC) resolution in each RF chain, power consumption can be dramatically lowered.  

MmWave channel estimation using sub6-GHz channel information

Due to hardware constraints, millimeter wave (mmWave) channel is not directly accessible and hence estimating mmWave channel for beamforming is difficult. Further, sub-6 GHz and mmWave systems are envisioned to work together, so assuming the knowledge of sub-6 GHz channel is reasonable.  Hence, it is worthwhile to investigate how the channel at sub-6 GHz and mmWave relate. This is particularly important for high mobility scenarios like vehicular communication, where frequent beam-training results in significant overhead.
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