Patent ID: 7177607
Filing Date: 2007-02-13
Classification: H03F,H04B

Abstract:
1. A transmitter arranged to transmit data modulated using one of a first modulation scheme and a second modulation scheme in each of a series of time slots, the transmitter comprising: a power amplifier operable in linear and non-linear modes; power control means, arranged to control the power supplied by the power amplifier; and a controller arranged to control the power amplifier to operate in the linear mode in time slots when the first modulation scheme is applied, and to operate in the non-linear mode in time slots when the second modulation scheme is applied, the controller being arranged, in respect of a time slot in which the second modulation scheme is used, to determine whether a transmission power in the time slot is lower than the transmission power in an immediately preceding time slot, and in response to a positive determination to control the power amplifier to operate in the linear mode during the time slot.