Influence of time and processing mismatches between phase and envelope signals in linearization systems using envelope elimination and restoration, application to Hiperlan2

This paper is a theoretical and experimental study of the influence of time and processing mismatches between the envelope and the phase of an OFDM in an envelope elimination and restoration (EER) linearization system. We give the theoretical expression of the power spectral density of the distorted signal in the case without intersymbol interference at the emitter. In the general case, we give the average power of the distortion as a function of the time mismatch. We also propose an approximation of the distorted signal as a delayed version of the original signal, that explains the observed rotations of the constellations at the receiver on the different OFDM carrier. Others effects of EER principle are also studied, such as limitation of envelope and phase bandwidth and non-linearity of the envelope restoration command.