Blind channel quality estimator
AssigneeMaxim Integrated Products, Inc.
InventorsAmir Hosein Kamalizad, Kaveh Razazian, Maher Umari
Life of this patent
Estimating the term…
Abstract
An embodiment is a method and apparatus to estimate channel quality. An absolute processor computes absolute real and imaginary values of real and imaginary parts, respectively, of output of a demodulator. A phase count unit generates first and second phase counts representing deviations from zero phase noise using the absolute real and imaginary values. An amplitude count unit generates first and second amplitude counts representing attenuation of a received signal using the absolute real and imaginary values. An integrator integrates the first and second phase counts and first and second amplitude counts into a signal quality indicator that represents a measure of quality of channel with respect to noise and fading.
Claims22
An apparatus comprising:
- an absolute processor coupled to a demodulator to compute absolute real and imaginary values of real and imaginary parts, respectively, of output of the demodulator;
- a phase count unit coupled to the absolute processor to generate first and second phase counts representing deviations from zero phase noise using the absolute real and imaginary values;
- an amplitude count unit coupled to the absolute processor to generate first and second amplitude counts representing attenuation of a received signal using the absolute real and imaginary values;
- and
- an integrator coupled to the phase and amplitude count units to integrate the first and second phase counts and first and second amplitude counts into a signal quality indicator that represents a measure of quality of channel with respect to noise and fading.
A method comprising:
- computing absolute real and imaginary values of real and imaginary parts, respectively, of output of a demodulator;
- generating first and second phase counts representing deviations from zero phase noise using the absolute real and imaginary values;
- generating first and second amplitude counts representing attenuation of a received signal using the absolute real and imaginary values;
- and
- integrating the first and second phase counts and first and second amplitude counts into a signal quality indicator that represents a measure of quality of channel with respect to noise and fading.
A system comprising:
- a front end processing module to process an input signal, the front end processing module comprising:
- an analog automatic gain control (AGC) processor to control an analog adjustable gain of the input signal using a feedback mechanism, the analog AGC processor generating a first signal,
- a root mean square (RMS) module coupled to the analog AGC processor to transform the first signal into a second signal, and
- a digital AGC processor coupled to the RMS module to control a digital adjustable gain of the second signal using a feed-forward mechanism to generate an output signal;
- a demodulator coupled to the front end processing module to demodulate a packet obtained from the output signal;
- and
- a channel quality estimator coupled to the front end processing module and the demodulator to provide a signal quality indicator, the channel quality estimator comprising:
- an absolute processor coupled to the demodulator to compute absolute real and imaginary values of real and imaginary parts, respectively, of output of the demodulator,
- a phase count unit coupled to the absolute processor to generate first and second phase counts representing deviations from zero phase noise using the absolute real and imaginary values,
- an amplitude count unit coupled to the absolute processor to generate first and second amplitude counts representing attenuation of a received signal using the absolute real and imaginary values, and
- an integrator coupled to the phase and amplitude count units to integrate the first and second phase counts and first and second amplitude counts into a signal quality indicator that represents a measure of quality of channel with respect to noise and fading.
Dependencies are inferred from the claim text.