Error detection circuitry and method for detecting an error on a transmission path
AssigneeMotorola, Inc.
InventorDietmar Fruehauf
Life of this patent
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Abstract
An error detection circuitry for detecting an error on a transmission path between a radio system (10, 12) and a transmitter is disclosed. The circuitry comprises means (16) for measuring the magnitude of a forward radio frequency signal directed from the radio system to the transmitter; means (16) for measuring the magnitude of a backward radio frequency signal directed from the transmitter to the radio system; and means for comparing the magnitudes of the forward radio frequency signal and the backward radio frequency signal. In a preferred embodiment of the invention a self-synchronization is provided for synchronizing a sampling of the output voltages of detecting circuits (24, 26) relative to the occurrence of a signal on the transmission path.
Claims16
An error detection circuitry for detecting an error on a transmission path between a radio system and a transmitter, the circuitry comprising:
- means for measuring the magnitude of a forward radio frequency signal directed from the radio system to the transmitter;
- means for measuring the magnitude of a backward radio frequency signal directed from the transmitter to the radio system;
- and
- means for comparing the magnitudes of the forward radio frequency signal and the backward radio frequency signal, wherein the means for measuring the magnitude of the forward radio frequency signal has a directional coupler providing a forward voltage;
- the means for measuring the magnitude of the backward radio frequency signal comprises the directional coupler providing a backward voltage;
- wherein the means for comparing calculate a ratio between the backward voltage and the forward voltage and decide that an error is present, when the ratio between the backward and the forward voltages exceeds a predetermined value.
An error detection circuitry for detecting an error on a transmission path between a radio system and a transmitter, the circuitry comprising:
- means for measuring the magnitude of a forward radio frequency signal directed from the radio system to the transmitter;
- means for measuring the magnitude of a backward radio frequency signal directed from the transmitter to the radio system;
- means for comparing the magnitudes of the forward radio frequency signal and the backward radio frequency signal;
- and
- means for generating a trigger signal having:
- a voltage divider generating a voltage drop signal on the basis of the occurrence of a TDMA signal on the transmission path;
- means for demodulating, smoothing and buffering the voltage drop signal;
- an amplifier for amplifying the demodulated, smoothed an buffered signal;
- a trigger circuit for processing the amplified signal;
- and a delay circuit for delaying the processed signal.
A method for detecting an error on a transmission path between a radio system and a transmitter comprising the steps of:
- measuring the magnitude of a forward radio frequency signal directed from the radio system to the transmitter;
- measuring the magnitude of a backward radio frequency signal directed from the transmitter to the radio system;
- and
- comparing the magnitudes of the forward radio frequency signal and the backward radio frequency signal, wherein in the first measuring step, the magnitude of the forward radio frequency signal is measured by using a directional coupler that provides a forward voltage;
- wherein in the second measuring step, the magnitude of the backward radio frequency signal is measured by using the directional coupler that provides a backward voltage;
- calculating a ratio between the backward voltage and the forward voltage;
- and
- deciding that an error is present, if the ratio between the backward and the forward voltages exceeds a predetermined value.
A method for detecting an error on a transmission path between a radio system and a transmitter comprising the steps of:
- measuring the magnitude of a forward radio frequency signal directed from the radio system to the transmitter:
- measuring the magnitude of a backward radio frequency signal directed from the transmitter to the radio system;
- comparing the magnitudes of the forward radio frequency signal and the backward radio frequency signal;
- generating a trigger signal by generating a voltage drop signal by a voltage divider on the basis of the occurrence of a TDMA signal on the transmission path;
- demodulating, smoothing and buffering the voltage drop signal;
- amplifying the demodulated, smoothed and buffered signal;
- processing the amplified signal in a trigger circuit;
- and
- delaying the processed signal.
Dependencies are inferred from the claim text.