FM signal quality measurement
First Claim
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1. A receiver comprising:
- a signal quality estimator configured to estimate the quality of signal reception in the receiver, the signal quality estimator comprising;
a first filter arranged to filter a signal received by the receiver to isolate a frequency band that includes a pilot signal; and
a signal analyser configured to form an indication of the degree to which the amplitude of the signal in that frequency band varies over time, said indication serving as an estimate of the quality of signal reception in the receiver; and
a control unit arranged to adjust operational parameters of the receiver with the assistance of said estimate and to, after an adjustment of at least one of the operational parameters, compare the estimate of the quality of signal reception following the adjustment with its value prior to the adjustment and to, if the comparison does not indicate an improvement in the quality of signal reception following the adjustment, reverse the adjustment.
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Abstract
A signal quality estimator for estimating the quality of signal reception in a signal receiver, the signal quality estimator comprising: a first filter for filtering a signal received by the receiver to isolate a frequency band therein; and a signal analyzer for forming an indication of the degree to which the amplitude of the signal in that frequency band varies over time, to serve as an estimate of the quality of signal reception in the receiver.
23 Citations
21 Claims
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1. A receiver comprising:
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a signal quality estimator configured to estimate the quality of signal reception in the receiver, the signal quality estimator comprising; a first filter arranged to filter a signal received by the receiver to isolate a frequency band that includes a pilot signal; and a signal analyser configured to form an indication of the degree to which the amplitude of the signal in that frequency band varies over time, said indication serving as an estimate of the quality of signal reception in the receiver; and a control unit arranged to adjust operational parameters of the receiver with the assistance of said estimate and to, after an adjustment of at least one of the operational parameters, compare the estimate of the quality of signal reception following the adjustment with its value prior to the adjustment and to, if the comparison does not indicate an improvement in the quality of signal reception following the adjustment, reverse the adjustment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for estimating the quality of signal reception in a receiver, the method comprising:
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filtering a signal received by the receiver to isolate a frequency band that includes a pilot signal; and forming a first indication of the degree to which the amplitude of the signal in that frequency band varies over time; using said first indication as an estimate of the quality of signal reception in the receiver; adjusting an operational parameter of the receiver; forming a second indication of the degree to which the amplitude of the signal in that frequency band varies over time following said adjustment; using said second indication as an estimate of the quality of signal reception in the receiver following said adjustment; comparing the first indication with the second indication; and reversing the adjustment if the comparison indicates that there has been no improvement in the quality of signal reception in the receiver following said adjustment. - View Dependent Claims (18, 19, 20, 21)
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Specification