Radio transmitter distortion reducing techniques

Details Radio transmitter distortion reducing techniques Radio transmitter distortion reducing techniques

2000-09-29

2001-11-27

Chang, Vivian (Department: 2682)

Telecommunications

Transmitter and receiver at separate stations

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

C455S501000, C375S297000

Reexamination Certificate

active

06324383

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to reducing distortion in a radio transmitter, and more particularly relates to reducing distortion due to the non-linearity of a component in the transmitter.
The Federal Aeronautics Administration has recently authorized a new class of radio transmitters which must meet more stringent requirements than preceding transmitters. The applicant has discovered that the new FAA requirements can be more easily met if non-linearity in various transmitter components, such as a power amplifier and attenuator, are reduced. The techniques described in this specification reduce such distortion and provide techniques for facilitating the design of transmitters which meet the new FAA requirements.
BRIEF SUMMARY OF THE INVENTION
The preferred embodiment is useful for reducing distortion in a transmitter radio signal suitable for use in an aviation radio transmitter which transmits within a predetermined range of frequencies. In such an environment, the preferred embodiment comprises a component defining a first non-linear transfer function. The preferred embodiment also comprises a source of an input signal containing information to be transmitted by the radio transmitter. The input signal is used to generate a first signal including the information to be transmitted and defining a second non-linear transfer function related to the first non-linear transfer function. The first signal is preferably generated by a signal converter. The component is responsive to the first signal to reduce distortion in the transmitter radio signal.
By using the foregoing techniques, the transfer function of a radio transmitter may be linearized with a degree of economy and accuracy previously unknown.


REFERENCES:
patent: 3878533 (1975-04-01), Kleiner
patent: 5598436 (1997-01-01), Brajal
patent: 6141390 (2000-10-01), Cova

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