Abstract:
Millimeter wave (mm-wave) MIMO system using hybrid pre-coding is one of the
promising technologies for improvement in the channel capacity. The ever growing
tra c exploration in cellular communication has recently drawn increased attention
to a large amount of underutilized spectrum in the millimeter-wave frequency bands
as a potentially visible solution for achieving tens of thousand times more capacity
compared to current 4G cellular bands.
There are several alternating minimization techniques which can be used to ex-
plore the underutilized band. Hybrid pre-coding is one of the promising technique
which can best utilize the underutilized band. Hybrid pre-coding has advantages
such as lower complexity and lower cost over its completely analog or digital counter
parts. However, there is a need to ascertain an optimum number of RF branches to
allow for highest channel e ciency with minimum implementation complexity.
This works represent the theoretical guarantee for alternate minimization using
hybrid pre-coding for any variety of phase retrieval problems. The use of the well
known least square algorithm to the PE-AltMin and extract the phase of the analog
pre-coder and alternatively optimize the digital and analog pre-coder, which signi -
cantly improves the performance of the system. Finally, the recent from the proposed
algorithm attesting the practicability of the mm-wave bands for cellular usage with
an acceptable amount of complexity and improvement in the performance.
