Base station transmitter in CDMA system

Details Base station transmitter in CDMA system Base station transmitter in CDMA system

2006-03-28

2006-03-28

Corrielus, Jean B. (Department: 2637)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S257000, C375S295000, C370S335000, C370S342000

Reexamination Certificate

active

07020179

ABSTRACT:
There is provided a base station transmitter in a CDMA system, comprising: a base station modem for direct-spectrum spreading PCM data to an I-channel and Q-channel; a digital combiner for summing up the spectrum-spread CDMA signals by sectors; a digital signal processor for making the data rate of the digital base-band CDMA signals outputted from the digital combiner twice; and an RF processor for converting the digital base-band CDMA signals outputted from the digital signal processor into analog RF CDMA signals, in which the digital signal processor includes first and second serial-to-parallel converters for converting the CDMA signals outputted from the digital combiner into parallel signals, first and second phase equalizers for compensating the phases of the converted parallel digital CDMA signals, and third and fourth 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 data rate twice that of the signals inputted thereto.

REFERENCES:
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patent: 6078576 (2000-06-01), Schilling et al.
patent: 6282184 (2001-08-01), Lehman et al.
patent: 6286994 (2001-09-01), Boesel et al.
patent: 6415153 (2002-07-01), Liew
patent: 6553018 (2003-04-01), Ichihara
patent: 6628667 (2003-09-01), Murai et al.

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