Optimization of an OFDM Rayleigh fading system: Research Articles

An OFDM cellular system operating in a Rayleigh fading environment is described and its spectral efficiency is estimated in terms of the theoretically achievable average channel capacity (in the Shannon sense) per user. The analysis covers the operation over a downlink cellular time-varying link and leads to a simple novel closed-form expression for the optimal number of individual OFDM subcarriers, based on the maximization of the achieved spectral efficiency. Copyright © 2006 John Wiley & Sons, Ltd.