GAIN CONTROL METRIC COMPUTATION IN A WIRELESS REPEATER
First Claim
1. A method for computing a gain control metric for a wireless repeater in a wireless communication system, the wireless repeater having a first antenna and a second antenna to receive a receive signal and transmit an amplified signal, the receive signal being a sum of a remote signal to be repeated and a feedback signal resulting from a feedback channel between the first and second antenna of the wireless repeater, the feedback channel thus forming a feedback loop between the first and second antennas, the method comprising:
- receiving a gain control input signal from a repeater circuitry of the repeater, the gain control input signal being taken from any point in the feedback loop of the repeater;
downsampling the gain control input signal at a first downsampling rate;
computing a correlation term for each of desired channel taps, the correlation term being indicative of a correlation of the gain control input signal and a delayed version of the gain control input signal;
computing a normalization term, the normalization term being indicative of a power of the gain control input signal that is not delayed;
downsampling the computed correlation terms and the normalization term at a second downsampling rate;
computing a pre-filtered gain control metric using a given function of at least the downsampled correlation terms; and
filtering the pre-filtered gain control metric to generate the gain control metric.
2 Assignments
0 Petitions
Accused Products
Abstract
A wireless repeater includes a gain control metric computation block to compute a gain control metric for use in controlling the variable gain of the repeater. The gain control metric is computed by downsampling the gain control input signal to the gain control metric computation block and also downsampling the computed correlation and normalization terms. The gain control metric may be further enhanced by filtering the computed metric values using linear or non-linear filtering.
-
Citations
25 Claims
-
1. A method for computing a gain control metric for a wireless repeater in a wireless communication system, the wireless repeater having a first antenna and a second antenna to receive a receive signal and transmit an amplified signal, the receive signal being a sum of a remote signal to be repeated and a feedback signal resulting from a feedback channel between the first and second antenna of the wireless repeater, the feedback channel thus forming a feedback loop between the first and second antennas, the method comprising:
-
receiving a gain control input signal from a repeater circuitry of the repeater, the gain control input signal being taken from any point in the feedback loop of the repeater; downsampling the gain control input signal at a first downsampling rate; computing a correlation term for each of desired channel taps, the correlation term being indicative of a correlation of the gain control input signal and a delayed version of the gain control input signal; computing a normalization term, the normalization term being indicative of a power of the gain control input signal that is not delayed; downsampling the computed correlation terms and the normalization term at a second downsampling rate; computing a pre-filtered gain control metric using a given function of at least the downsampled correlation terms; and filtering the pre-filtered gain control metric to generate the gain control metric. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A wireless repeater having a first antenna and a second antenna to receive a receive signal and transmit an amplified signal, the receive signal being a sum of a remote signal to be repeated and a feedback signal resulting from a feedback channel between the first antenna and the second antenna, the feedback channel thus forming a feedback loop between the first and second antennas, the repeater comprising:
-
a repeater circuitry configured to receive the receive signal from one of the first antenna and the second antenna and provide a gain control input signal, the gain control input signal being taken from any point in the feedback loop of the repeater; and a gain metric generator coupled to receive the gain control input signal from the repeater circuitry of the repeater, the gain metric generator configured to downsample the gain control input signal at a first downsampling rate, to compute a correlation term for each of desired channel taps where the correlation term is indicative of a correlation of the gain control input signal and a delayed version of the gain control input signal, to compute a normalization term where the normalization term is indicative of a power of the gain control input signal that is not delayed, to downsample the computed correlation terms and the normalization term at a second downsampling rate, to compute a pre-filtered gain control metric using a given function of at least the downsampled correlation terms, and to filter the pre-filtered gain control metric to generate the gain control metric. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
-
-
25. A wireless repeater having a first antenna and a second antenna to receive a receive signal and transmit an amplified signal, the receive signal being a sum of a remote signal to be repeated and a feedback signal resulting from a feedback channel between the first antenna and the second antenna, the feedback channel thus forming a feedback loop between the first and second antennas, the repeater comprising:
-
means for receiving the receive signal from one of the first antenna and the second antenna and providing a gain control input signal, the gain control input signal being taken from any point in the feedback loop of the repeater; and means for receiving the gain control input signal from the repeater circuitry of the repeater, the means further for downsampling the gain control input signal at a first downsampling rate, computing a correlation term for each of desired channel taps where the correlation term is indicative of a correlation of the gain control input signal and a delayed version of the gain control input signal, computing a normalization term, the normalization term being indicative of a power of the gain control input signal that is not delayed, downsampling the computed correlation terms and the normalization term at a second downsampling rate, computing a pre-filtered gain control metric using a given function of at least the downsampled correlation terms, and filtering the pre-filtered gain control metric to generate the gain control metric.
-
Specification