Power Allocation for Wireless Video Streaming over MIMO Systems with Superposition Coding

Abstract

Recently, video distribution over wireless networks has become more common due to the spread of smart devices. This paper proposes an optimal power allocation algorithm for the transmission of layered video streams over point-to-point multiple-input multiple-output (MIMO) systems combined with superposition coding. The proposed power allocation scheme is derived from the maximization of the weighted sum-rate, where two-step optimization leads to a closed-form solution. First, the power distribution between eigen-channels is optimized, and then the optimal power allocation to quality layers is obtained. Results demonstrate that the proposed scheme attains higher peak signalto-noise ratio on average in a wide range of signal-to-noise ratio than conventional fixed power allocation schemes.