Reducing the peak to average ratio of multicarrier GSM and edge signals

In conventional base station solutions, the carriers transmitted are combined after the power amplifiers. An alternative to this is to combine the carriers in the digital domain. The major drawback of the digital carrier combining is a strongly varying envelope of the composite signal. The high PAR, sets strict requirements for the linearity of the power amplifier. High linearity requirements for the power amplifier leads to low power efficiency and therefore to high power consumption. In this paper, the possibility of reducing the PAR by clipping is investigated in two cases, GSM and EDGE.