Power amplifier back-off analysis with AM-to-PM for millimeter-wave OFDM wireless LAN

With a simple AM-to-PM modeling and system simulation techniques, power amplifier adjacent channel power ratio(ACPR) is calculated for millimeter-wave OFDM wireless LAN. The required amplifier back-off for specified ACPR and the ACPR degradation are predicted for the AM-to-PM nonlinearity. More than 10 dB additional back-off is required if the amplifier has 5/spl deg/ AM-to-PM at the 1.0 dB compression, and the required back-off increases to 1.4 dB as the AM-to-PM increases to 10/spl deg/ compared to the case without phase distortion.

Introduction

Because microwave frequency bands have become saturated with various applications, there is a growing necessity to exploit new frequency band which has not yet been utilized for commercial purposes. The 60GHz band is of special interest for wireless LAN and short range communication because of the about 15dB/km attenuation due to atmospheric oxygen[1].