Method and apparatus for stability margin determination in a repeater
AssigneeAllgon AB
InventorDaniel Kerek
Life of this patent
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Abstract
A method and device for determining the stability margin of a RF repeater. The method is carried out in two steps, viz. establishing the amplification of the repeater as a function of the frequency in a frequency band, and observing the magnitude of wave-like variations in the established frequency response, this magnitude constituting a measure of the stability margin such that an increasing magnitude corresponds to a decreasing stability margin.
Claims7
An apparatus for determining a stability margin (SM) with respect to a possible self-oscillation in a radio frequency repeater receiving, amplifying and retransmitting radio frequency signals between an input and an output, and operating with a predetermined delay between the input and the output, and having a feedback path between said output and said input, said apparatus comprising
- at least one sensing element connected to at least said output of the repeater,
- at least one measurement receiver connected to said at least one sensing element for measuring at least an output signal from said repeater, on the basis of which the stability margin is calculated,
- said sensing element establishing an amplification of the repeater as a function of the radio frequency in a frequency band, and
- means for producing a magnitude (MA) of harmonic variations in a signal level for various frequencies measured by the at least one measurement receiver constituting a measure of the stability margin in that an increase of the magnitude of the harmonic variations corresponds to a decrease of the stability margin and vice versa.
Dependencies are inferred from the claim text.