AG Kommunikationstheorie

Thema:

Portfolio theory for resource management in multi-carrier communication

Abstract:

A portfolio is a collection of financial "assets" (bonds, stocks, etc). An asset's key characteristics are its average "return" and its "risk". The return is the (random) pay-off yielded by the asset per unit of money invested in it. The risk is usually captured through the variance of the return. The typical investor likes high returns, but dislikes risks. Often, the high return assets also carry the highest risks, which makes the investor's problem non-trivial. Portfolio theory seeks the optimal portfolio given relevant statistical information and an investor preferences.

In this talk we will briefly explore recent proposals that apply portfolio theory for resource management in multi-carrier communication (OFDM), with special emphasis on the dynamic-spectrum access ('cognitive') scenario. The basic idea is that each sub-carrier can be viewed as an "asset" whose return is the throughput. A terminal may distribute its power budget among selected sub-carriers in order to minimise the variance while achieving a desired level of throughput. All work to be discussed has been done elsewhere by other authors.



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