Power Allocation and Bit Loading for Fixed Wireless MIMO Channels

Conference: SCC 2013 - 9th International ITG Conference on Systems, Communication and Coding
01/21/2013 - 01/24/2013 at München, Deutschland

Proceedings: SCC 2013

Pages: 6Language: englishTyp: PDF

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Delamotte, Thomas; Bauch, Gerhard (Institute of Information Processing, Universität der Bundeswehr München, 85579 Neubiberg, Germany)
Dantona, Vito; Lankl, Berthold (Institute of Communications Engineering, Universität der Bundeswehr München, 85579 Neubiberg, Germany)

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. Index Terms — Waterfilling, mercury/waterfilling, mutual information, Multiple-Input-Multiple-Output (MIMO), bit loading.