| Our study is to solve key techno1ogy of baseband digital signal processing forhigh-speed modulator and introduce a new digital Nyquist filteLBecause the date-rate of the modem is high, we can't use normal filter toprocess baseband signal. We introduce a new digital Nyquist filter based on paralleldate-table.This paper presents the author's research on the system, which mainly includethe content as follows:l. The development status on high-speed modem is introduced.2. The basic theory of high-speed modulator is analyzed, while some keytechnologies of the high-speed modulator is dicussed.3. The basic theory of baseband digital signal processing is discussed and akind of new digital filter based on paral1e1 date-table is studied.4. The key technology is emulated by CAD and the circuit is showed.
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