Abstract:

A new evaluation approach for the in-band nonlinear distortion, which is formed by the orthogonal frequency division multiplex (OFDM) signal passing through the high power amplifier, is presented. Comparing with widely used nonlinear additive Gaussian noise models, the new approach is based on the properties of the large deviations of a stationary Gaussian process and shot noise theories, which offer important insights into the true nature of clipping distortion as well as detail information on clipping induced impulse noise and its impacts on the system when the OFDM signal is transferred and processed. The methodology can also be extended to be used in many communications systems with high peak-average-ratio and peak-limited nonlinearities, and the downlink performance analysis of large capacity code division multiple access (CDMA) systems.

Key words: orthogonal frequency division multiplex, code division multiple access, peak-limited nonlinearities, impulse noise