Title:
TRANSMITTER OF MULTIPLE FREQUENCY RADIO COMMUNICATION SYSTEM
Document Type and Number:
WIPO Patent Application WO2000008864
Kind Code:
A3
Abstract:
A transmitter for a multiple frequency radio communication system provides a capability for filtering spread spectrum signals of a multiple frequency system by using one lowpass filter (219), and variably controlling the sampling speed when converting the lowpass filtered digital signal into an analog signal. In one embodiment, the transmitter comprises a clock generating section (221, 223, 224) for receiving a predetermined bandwidth selecting control signal (217) and then generating a clock having a speed in proportion to the predetermined bandwidth, a multiplexing section (218) for inserting zero into a signal, spread modulated in a desired bandwidth, the bandwidth being selected from the plurality of frequency bandwidths according to the predetermined bandwidth selecting control signal, to produce an oversampled signal, a lowpass filter (219) for receiving the clock and for lowpass filtering an output signal of the multiplexing section (218), a digital/analog converter (220) for receiving the clock and then converting an output signal of the lowpass filter (219) into an analog signal at the clock speed, and a switch (222) for receiving the bandwidth selecting control signal and then switching an output of the digital/analog converter (220) to a corresponding one of a plurality of intermediate frequency circuits (225 to 227) according to the selected bandwidth.
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Inventors:
HWANG SEONG-KYU
Application Number:
PCT/KR1999/000423
Publication Date:
June 02, 2000
Filing Date:
August 02, 1999
Export Citation:
Assignee:
SAMSUNG ELECTRONICS CO LTD (KR)
International Classes:
H04B1/707; H04B1/00; H04J1/00; (IPC1-7): H04B1/10
Foreign References:
| EP0715417A2 | 1996-06-05 | |||
| US5533064A | 1996-07-02 | |||
| JPH0964929A | 1997-03-07 |
Other References:
See also references of EP 1044509A2
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