PEAK FACTOR REDUCING DEVICE, ESPECIALLY IN RELATION TO A BASEBAND SIGNAL PROCESSING DEVICE FOR CDMA BASE STATION WHICH NEEDS TO HANDLE A SIGNAL IN ACCORDANCE WITH NORMAL DISTRIBUTION HAVING A BIG PEAK FACTOR

摘要

PURPOSE: A peak factor reducing device is provided to operate a subtraction with a peak amplitude by using a compensation signal, thereby suppressing a signal quality deterioration caused when reducing a peak factor, consequently a peak factor reducing effect can be magnified. CONSTITUTION: An input signal is inputted to a reference filter(101). A peak amplitude caused when a band limit is carried out is observed. An amplitude controller(104) extracts a waveform produced from a part where an output of the reference filter(101) exceeds a set value(AO). An input signal is delayed in a delayer(102) by generating an impulse signal having an amplitude proportionate to a maximum value, to adjust the impulse signal at timing. An adder(103) operates a signal subtraction by subtracting the impulse signal from an output of the delayer(102).