Pulse or digital communications – Repeaters – Testing
Patent
1996-12-26
2000-02-15
Vo, Don N.
Pulse or digital communications
Repeaters
Testing
375206, 375219, 455 78, 455 86, 370280, 370294, H04B 169
Patent
active
060261145
ABSTRACT:
A transmitting and receiving apparatus of a time division full-duplex spread spectrum communication system prevents transmitting or receiving sensitivity from deteriorating because of the generation of only one oscillation frequency upon transmission or reception using a PLL. The transmitting and receiving apparatus includes a time division duplexer for switching between transmitting and receiving modes; an amplifier for amplifying a receiving signal; a first band pass filter for receiving the amplified receiving signal, and passing only a signal of a given band; a low pass filter for low pass filtering a received pseudonoise (PN) code and data as a square wave signal, and for converting the square wave signal into a sine wave signal; a main phase locked loop for generating a main oscillation frequency; a first mixer for generating a first intermediate frequency signal; a second band pass filter for passing only the first intermediate frequency signal; a fixed phase locked loop for generating different first and second oscillation frequencies in response to an externally supplied control voltage; a demodulator for mixing the first intermediate frequency signal with the second oscillation frequency, converting and amplifying the mixed signal into a second intermediate frequency signal, and demodulating the amplified signal as the PN code and data; a second mixer for mixing the first oscillation frequency signal with the main oscillation frequency, and generating a transmitting signal; and a third band pass filter for passing only the transmitting signal in a desired band.
REFERENCES:
patent: 5276913 (1994-01-01), Lee et al.
patent: 5319799 (1994-06-01), Morita
patent: 5515364 (1996-05-01), Fague
patent: 5717719 (1998-02-01), Park et al.
patent: 5764685 (1998-06-01), Tanaka et al.
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