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Bit loading for OFDM with Quasi-constant transmission power

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2 Author(s)
Ben Izhak, E. ; School of Electrical Engineering, Dept. of Electrical Engineering-Systems, Tel Aviv University, Tel Aviv, Israel ; Amrani, O.

This work addresses the problem of adaptive bit loading typically employed for approaching the capacity of a fading channel. Multi-carrier transmission over frequency-selective fading is employed. In particular, this work is concerned with the question of obtaining an adaptation technique that will keep the transmitted power as constant as possible over all subcarriers, i.e. quasi-constant transmission power, assuming a general, un-constrained set of coded-modulation schemes. A computationally efficient algorithm is described for solving this so-called minimum-deviation problem. The proposed solution is shown to be optimum under a given set of constraints. It is also demonstrated, via simulations, to provide throughput comparable to other known methods whose aim is to optimize system throughput.

Published in:

Electrical and Electronics Engineers in Israel, 2006 IEEE 24th Convention of

Date of Conference:

Nov. 2006

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