POWER RAMPING CONTROLLER OF A GSM AND A GPRS TRANSMITTER AND A CONTROLLING METHOD THEREOF, SPECIFICALLY CORRELATED TO ENABLING EACH SLOT TO COMPRISE GUARD INTERVALS HAVING U-SHAPED POWER LEVEL WAVEFORMS

摘要

PURPOSE: A power ramping controller of a GSM and a GPRS transmitter and a controlling method thereof are provided to power ramp-down guard intervals for distinguishing each slot, and to make power differences largely so as to have U-shaped power waveforms by power ramping-up the guard intervals, thereby reducing interference between the slots and easily reading slot information. CONSTITUTION: A ramp memory(422) uniformly divides the entire power levels of slots, and stores a range of the divided power levels up to a top address from a bottom address. A counter assigns a start address of the ramp memory(422) for designating a power level of the first slot and a final address of the ramp memory(422) for designating a power level of the second slot to a lower index and an upper index, respectively. A controller portion(410) divides guard intervals as many as the number of indexes of the counter, sequentially downs the start address while increasing the lower index by 1, and sequentially downs the final address while reducing the upper index by 1. The controller portion(410) designates an address of a moment when a difference between the start address and the final address becomes 0 or 1 as an inflection address, and determines ramp steps with the power levels stored in the addresses corresponding to the indexes of the counter.