Base band signal transmitting device in base station of mobile c

Details Base band signal transmitting device in base station of mobile c Base band signal transmitting device in base station of mobile c

1997-11-21

2000-04-18

Pham, Chi H.

Multiplex communications

Channel assignment techniques

Combining or distributing information via code word channels...

375206, C01B 3132, H04B 1500

Patent

active

060523786

ABSTRACT:
A base band signal transmitting device in a base station of a mobile communications system is disclosed including a CDMA modem unit constructed in a manner that a plurality of CDMA modems are detachably mounted on one board, each of the CDMA modems converting a digital voice signal into direct band spread signal by sectors, to generate a digital base band signal; a digital signal summing unit constructed in a manner that a digital summing device is mounted on another board, the digital summing device for digital-summing the direct band spread digital signals received from the CDMA modem unit by sectors and transmitting them in parallel; and a signal processing unit including a FIR low pass filter for converting the digital signals received from the digital signal summing unit into parallel signals and removing high frequency component from them, a digital/analog converter for converting the output signals of the FIR low pass filter into analog signals, and a base/intermediate frequency band upward conversion circuit for upward-converting the base band analog signals converted by the converter into analog signals of intermediate frequency band and high frequency band, the FIR low pass filter, digital/analog converter and base/intermediate frequency band upward conversion circuit being mounted on another separate board.

REFERENCES:
patent: 5748623 (1998-05-01), Sawahashi et al.

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