Channel Estimation in Mixed Hybrid-Low Resolution MIMO Architectures for mmWave Communication
Authors: J. Rodriguez-Fernandez, N. Gonzalez Prelcic, L. Castedo, Robert W. Heath, Jr.
Proc. of the Asilomar Conf. on Signals, Systems, and Computers, Pacic Grove, CA, November 6-9, 2016, pp. 768-773
Mixed hybrid-low resolution MIMO architectures reduce both the number of ADCs and their resolution to reduce power consumption. In such a system, the received signal suffers from two compression stages. One is due to the analog processing stage and the reduced number of RF chains, while the other is a result of signal quantization by the ADC converters. The compression steps both complicate the estimation of the MIMO channel. In this paper we propose a compressive channel estimator that exploits the sparse structure of the millimeter wave channel to compensate for the loss of information inherent to the proposed architecture.