Power Allocation and Bit Loading for Fixed Wireless MIMO Channels

Power allocation and bit loading strategies can be considered in the context of diagonalized MIMO channels in order to maximize the achievable sum rate for a given sum transmit power. An algorithm, known as QoS based waterfilling, was specifically designed for such applications. In this contribution, based on the recently discovered mutual information maximizing mercury-waterfilling power allocation, we design a new strategy and compare its performance to the state of the art QoS based Waterfilling. It is shown that a simple modification of the latter algorithm can significantly improve the system performance with affordable complexity.