Throughput Maximization In Multiple Antenna Communication Systems Through Quantized Rate Control

In the recent years, we have witnessed an increasing demand for the high data rate wireless communication systems. While most of the research efforts has been focused on the minimization of the packet error probability through an adaptive transmission scheme, the overall optimization of the system throughput is not well addressed. We consider the problem of throughput maximization using a quantized feedback that is an appropriate model for practical systems with limited feedback capacity. We derive the optimal quantized rate control design for general multiple transmit and multiple receive antenna systems. Moreover, an adaptive stochastic gradient search algorithm has been proposed that can efficiently find the optimal solution. It is shown that the proposed quantized rate control design with only a few bits of feedback considerably improves the throughput of a system for a given average power