Compensation for transmission element nonlinearities in a radio

Details Compensation for transmission element nonlinearities in a radio Compensation for transmission element nonlinearities in a radio

1980-06-06

1982-08-24

Robinson, Thomas A.

Telecommunications

Carrier wave repeater or relay system

With frequency conversion

455 20, 455313, 328158, 328162, 328165, 332 37R, H04B 166, H04B 1500

Patent

active

043464793

ABSTRACT:
In order to compensate for nonlinearities introduced by a transmission member in a radio relay transmission system by means of a distortion converter stage, the converter stage is supplied with an intermediate frequency signal modulated with the useful signal, and with a local oscillator signal, a desired high frequency signal with its desired level is provided by a first mixing diode included in a first converter, a desired high frequency signal with a level below its desired level and with a phase shift is provided by a second mixing diode included in a second converter, the two high frequency signals are combined in a summing member, and the high frequency signal provided by the second converter is set by a level and phase controller so that the combined high frequency output signal has a distorted component whose amplitude coincides with the amplitude of the distorted signal component introduced by the transmission member but whose phase is in phase opposition with the latter.

REFERENCES:
patent: 2279177 (1942-04-01), Plebanski
patent: 2405765 (1946-08-01), Smith
patent: 2705775 (1955-04-01), Crosby
patent: 3528037 (1970-09-01), Yamazaki

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