Channel State Information feedback overhead reduction using Arithmetic coding in massive MIMO systems

By the virtue of the large number of antennas, the massive Multiple Input Multiple Output (MIMO) systems grant high spectral efficiency along with the promising gain in capacity. For the optimal detection of system parameters, generally perfect Channel State Information (CSI) is assumed to be known at both transmitter and receiver. However, in practice, due to mobility of communication environment, the impulse response of the channel varies, thus inducing the need of channel estimation. In addition, a permanent feedback signalling is required to notify the estimated CSI at the transmitter. Large number of time slots are engaged during the feedback, thus reducing the bandwidth efficiency of the system. This paper deals with reduction of feedback overhead by using Arithmetic coding for the estimated channel in the massive MIMO systems. Block type pilot estimation technique has been considered for the channel estimation.