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AssigneeNokia Siemens Networks Oy
InventorsDarrell Barabash, Russell Morris, Donald Hutton
Estimating the term…
Systems and techniques for return loss estimation are described. A forward power sample is taken from a power amplifier of a transmitter by sampling a feedback signal used for power control of the amplifier, and a reflected power sample at an output of the power amplifier is taken by observing the power at a circulator termination of the power amplifier. A difference determination is made for the forward power sample and the fleeted power sample in the analog domain to determine a return loss and may be digitized for further processing such as return loss measurement and comparison against thresholds. A further comparator circuit may be used to insure that measurements are made when the signal strength is adequate.
A method comprising:
An apparatus comprising:
The apparatus of claim 17, further comprising a comparator receiving as inputs a minimum power setpoint value and at least one modulation-free signal from at least one of the modulation removal filters, and produce, based on the inputs, an output signal indicating whether or not the signal levels are sufficient to make a valid measurement.
Dependencies are inferred from the claim text.