Frequency selective multiuser hybrid precoding for mmWave systems with imperfect channel knowledge
Authors: J. P. Gonzalez-Coma, 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. 291-295
In this work we design the precoders/combiners for a multiuser mmWave system considering a frequency selective channel model. We assume that the available channel information is imperfect, and only the estimates of the autocorrelation of the received signal, and the cross-correlation with the transmitted signal are available. Using this knowledge, the precoder and combiners are designed via an iterative MMSE algorithm. The solutions are decomposed into the frequency-flat analog and frequency-selective digital precoders/combiners, which obtain a close performance to the all-digital solution in terms of achievable rate as shown in the simulations.