Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1992-10-30
1995-08-22
Urban, Edward F.
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
455 84, H04B 144
Patent
active
054448638
ABSTRACT:
There is provided a radio communication apparatus wherein a band-pass filter and a variable attenuator of a radio high-frequency circuit are designed such that these can be commonly used by transmitter and receiver systems. In a base-band circuit system, analog low-pass filters for smoothing a base-band signal and roll-off filters for removing unnecessary frequency components by digital filtering processing are designed such that these can be commonly used by the transmitter system and receiver system. In the demodulation system adopted in the orthogonal circuit system, orthogonal detection is followed by delay detection, and multipliers for orthogonal modulation are also used as multipliers for orthogonal demodulation. Further, for common use of the circuit elements by the transmitter system and receiver system, switches for connecting the signal line to the transmitter system or the receiver system in the transmission/reception mode are provided at one end or both ends of each of these circuits.
REFERENCES:
patent: 3860870 (1975-01-01), Furuya
Kabushiki Kaisha Toshiba
Pham Chi H.
Urban Edward F.
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