Patent ID: 7020179
Filing Date: 2006-03-28
Classification: H04B

Abstract:
1. A base station transmitter in a CDMA system, comprising: a base station modem for direct-spectrum spreading PCM data to I-channel and Q-channel CDMA signals; a digital combiner for summing up the spectrum-spread CDMA signals by channels into digital base-band CDMA signals; a digital signal processor for converting the digital base-band CDMA signals into parallel signals with a first data rate and for outputting the parallel signals with a second data rate that is twice a data rate of the first data rate; and an RF processor for converting the digital base-band CDMA signals outputted from the digital signal processor into analog RF CDMA signals; wherein the digital signal processor includes: first and second serial-to-parallel converters for converting the digital base-band CDMA signals from the digital combiner into parallel signals: first and second phase equalizers for compensating phases of the converted parallel digital CDMA signals; and first and second FIR filters for filtering the digital CDMA signals whose phases were compensated with a predetermined sampling frequency to make the digital CDMA signals have the second data rate.