Patent ID: 8279971

Claim:
A method of determining a level of power reduction for a transmitter arranged to transmit signals via a number of radio channels in a digital wireless communications system, each of said signals being modulated according to one of a number of modulation configurations, the method comprising the steps of: providing data dependent on a property of a modulation configuration, said modulation dependent data comprising a at least one term calculated from a third order product of a signal modulated according to said modulation configuration; calculating from said modulation dependent data an estimate for a power reduction to be used for transmission from said transmitter of signals modulated according to said modulation configuration; providing the modulation dependent data so that said modulation dependent data in addition to said at least one term calculated from a third order product comprise at least one term calculated from a higher order product of the signal modulated according to said modulation configuration; providing data dependent on a property for said transmitter; and calculating said estimate for a power reduction from said modulation dependent data and said transmitter dependent data.