Patent ID: 7123644

Claim:
A peak cancellation apparatus of a transmission unit of a base station comprising: a parallel/serial converter for converting parallel signals inputted from a plurality of channels into serial signals; a multiplier for multiplying an output signal of the parallel/serial converter by a PN code; a first pulse shaping filter for shaping a pulse of the signal outputted from the multiplier; a D/A converter for converting the shaped signal into an analog signal; and a peak cancellation circuit, which is positioned between the first pulse shaping filter and the D/A converter, to cancel a peak component of a peak signal received from the first pulse shaping filter, the peak cancellation circuit including: a peak detector to detect the peak signal from the first pulse shaping filter, an impulse generator to generate an impulse signal based on the peak signal, and a second pulse shaping filter to adjust a width of the impulse signal to at least substantially correspond to a width of a main path signal of the transmission unit, the peak component of the peak signal being canceled based on the impulse signal output from the second pulse shaping filter.