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At millimeter wave (mmW) frequencies, beamforming and large antenna arraysare an essential requirement to combat the high path loss for mmWcommunication. Moreover, at these frequencies, very large bandwidths areavailable to fulfill the data rate requirements of future wireless networks.However, utilization of these large bandwidths and of large antenna arrays canresult in a high power consumption which is an even bigger concern for mmWreceiver design. In a mmW receiver, the analog-to-digital converter (ADC) isgenerally considered as the most power consuming block. In this paper,primarily focusing on the ADC power, we analyze and compare the total powerconsumption of the complete analog chain for Analog, Digital and Hybridbeamforming (ABF, DBF and HBF) based receiver design. We show how powerconsumption of these beamforming schemes varies with a change in the number ofantennas, the number of ADC bits (b) and the bandwidth (B). Moreover, wecompare low power (as in [1]) and high power (as in [2]) ADC models, and showthat for a certain range of number of antennas, b and B, DBF may actually havea comparable and lower power consumption than ABF and HBF, respectively. Inaddition, we also show how the choice of an appropriate beamforming schemedepends on the signal-to-noise ratio regime.

Towards an Appropriate Receiver Beamforming Scheme for Millimeter Wave Communication: A Power Consumption Based Comparison