Performance Analysis of MIMO Ad Hoc Networks with Finite Rate Feedback and Imperfect CSIT

This paper deals with the network spectral efficiency/capacity analysis of multiple-input multiple-output (MIMO) ad hoc network with K simultaneous communicating transceiver pairs in two scenarios; quantized beamforming for achieving finite rate feedback and imperfect channel state information at the transmitter (CSIT). In the quantized beam forming, each receiver chooses the best beamforming vector from the code book that has been designed using the concept of Grassmannian beamforming. Each receiver sends the label of the best beamforming vector to the transmitter through finite rate limited feedback. Private code book is shared between each transmitter-receiver pair to prevent the decoding of other user´s information. In this work, the capacity loss due to quantized beamforming is derived. An expression for spectral efficiency is derived for imperfect CSIT, with the assumption that each transmitter is equipped with t antennas and each receiver with r antennas and each receiver implements single-user detection.