Communication base station system for transmitting data to a mov

Details Communication base station system for transmitting data to a mov Communication base station system for transmitting data to a mov

1994-06-24

1996-11-12

Pham, Chi H.

Telecommunications

Transmitter and receiver at separate stations

Distortion, noise, or other interference prevention,...

455 17, 455103, 455115, H04B 104

Patent

active

055749801

ABSTRACT:
A communication base station system for transmitting data to a movable body includes a plurality of transmission sections, each of the transmission sections receiving a transmission data, modulating this received transmission data, and then converting the frequency of this modulated transmission data to a preset frequency and outputting a result. A control section monitors a status of use of the transmission sections, and if having confirmed at least two transmission sections that do not transmit any data, the control section outputs a specified signal instead of the transmission data to two transmission sections among the confirmed transmission sections. An amplification section collectively amplifies a plurality of output signals from the transmission section and a compensation circuit compensates for intermodulation distortion components generated in the amplification section based on an output of a transmission section that has received the specified signal and its respective transmission frequency. In the present invention configured as above, the two transmission sections that do not transmit any data receive a signal of specified pattern, these transmission sections that have received the signal of specified pattern generate output signals. Using these output signals, intermodulation distortion components caused by non-linearity of an amplifier are compensated for.

REFERENCES:
patent: 5115514 (1992-05-01), Leslie
patent: 5163181 (1992-11-01), Koontz
patent: 5295138 (1994-03-01), Greenberg

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