Adjusted Orthogonal Matching Pursuit based Channel Estimation for Hybrid Beamforming Millimeter Wave Wireless Communication Systems

The paper considers Millimeter Wave Wireless Communication systems based on hybrid precoder-combiner structure with low-bit resolution analog-to-digital converters (ADCs). Though the hybrid precoder-combiner structure and low-bit resolution ADCs address the problem of huge power consumption in the system, channel estimation for the system is cumbersome. In this paper, a new channel estimation scheme based on adjusted Orthogonal Matching Pursuit (OMP) algorithm is proposed. The estimator named “AdOMP-based channel estimator” exploited the side information available at the receiver of the system to enhance the channel estimation procedure. We show through computer simulation that the proposed AdOMP-based channel estimator exhibit better performance, in the wideband wireless channel, in comparison with other three estimators i.) as the number of transmit antennas increases, ii.) as the number of radio frequency (RF) chains increases, and iii.) across the number of frames employed.