METHOD AND APPARATUS FOR COMPLEMENTARY CUMULATIVE DISTRIBUTION DRIVEN LEVEL CONVERGENCE FOR SPECTRUM SENSING
First Claim
1. A method for use in a communications receiver for controlling an input signal level into an analog-to-digital converter (ADC) comprising the steps of:
- measuring a threshold crossing rate as a percentage samples of an input signal that exceed the threshold;
computing an error between the measured threshold crossing rate and a desired reference threshold crossing rate; and
utilizing an error signal in a feedback loop to control the receiver gain such that the error is reduced.
2 Assignments
0 Petitions
Accused Products
Abstract
A method for use in a digital communications receiver for controlling an input signal level (200) into an analog-to-digital converter (ADC) initially receives a sample sequence (201) where a threshold crossing rate is measured as a percentage samples of an input signal that exceed the threshold (203). The error between the measured threshold crossing rate and a desired reference threshold crossing rate is calculated (205) and an error signal is then utilized in a feedback loop to control the receiver gain such that the error is reduced (207).
-
Citations
13 Claims
-
1. A method for use in a communications receiver for controlling an input signal level into an analog-to-digital converter (ADC) comprising the steps of:
-
measuring a threshold crossing rate as a percentage samples of an input signal that exceed the threshold; computing an error between the measured threshold crossing rate and a desired reference threshold crossing rate; and utilizing an error signal in a feedback loop to control the receiver gain such that the error is reduced. - View Dependent Claims (2, 3, 4)
-
-
5. A digital communications receiver comprising:
-
at least one controllable amplifier stage; and at least one analog-to-digital converter (ADC) for receiving a signal from the at least one controllable amplifier stage; and at least one gain controller and wherein the at least one gain controller operates using the steps of; receiving at least one input sample x(n); calculating a complementary cumulative distribution function (CCDF) for sample x(n) based upon the function - View Dependent Claims (6, 7, 8, 9)
-
-
10. A method for use in a digital communications receiver for controlling an input signal level of an amplifier before supplying the signal to an analog-to-digital converter (ADC), the method comprising the steps of:
-
receiving a radio frequency (RF) input signal; measuring a threshold crossing rate as a percentage of a predetermined number of signal samples that exceed a predetermined threshold; computing an error between the measured threshold crossing rate and a desired reference value for providing an error signal; and using the error signal in a feed back loop to calculate a gain control value for the amplifier to reduce error in the ADC. - View Dependent Claims (11, 12, 13)
-
Specification