STABILITY RECOVERY FOR AN ON-FREQUENCY RF REPEATER WITH ADAPTIVE ECHO CANCELLATION
First Claim
1. A wireless repeater, comprising:
- an input antenna for receiving an input signal;
an output antenna for outputting an amplified signal;
an amplifier for amplifying the received input signal and providing the output amplified signal to the output antenna; and
an internal feedback path for adaptively cancelling an echo between the output antenna and the input antenna by implementing an adaptive algorithm employing a list having a plurality of list elements, each list element comprising one or more echo cancellation parameters and one or more repeater settings.
7 Assignments
0 Petitions
Accused Products
Abstract
A wireless repeater includes an internal feedback path for adaptively cancelling an echo between an output antenna and an input antenna. The internal feedback path employs an adaptive algorithm implementing a list having a plurality of list elements. Each list element has one or more echo cancellation parameters and one or more repeater settings. The list may be pruned by employing a minimum distance between elements within the list. A method for stabilizing a wireless repeater includes obtaining an autocorrelation of a signal in a signal path of the repeater, detecting an echo in the signal path based on the autocorrelation, providing a list of elements indicating past successful echo cancellation coefficients and associated repeater settings, and adaptively adjusting an error of the echo cancellation coefficients to cancel the echo in the signal path.
49 Citations
37 Claims
-
1. A wireless repeater, comprising:
-
an input antenna for receiving an input signal; an output antenna for outputting an amplified signal; an amplifier for amplifying the received input signal and providing the output amplified signal to the output antenna; and an internal feedback path for adaptively cancelling an echo between the output antenna and the input antenna by implementing an adaptive algorithm employing a list having a plurality of list elements, each list element comprising one or more echo cancellation parameters and one or more repeater settings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method for recovering stability of a repeater in a wireless communication system, comprising:
-
providing a list having a plurality of list elements, each list element comprising one or more echo cancellation parameters and one or more associated repeater settings; detecting a current repeater setting; comparing the current repeater setting to those in the list; and selecting an echo cancellation parameter with the most similar repeater setting in the list. - View Dependent Claims (13, 14, 15, 16)
-
-
17. A method for stabilizing a wireless repeater, comprising:
-
obtaining an autocorrelation of a signal in a signal path of the repeater; detecting an echo in the signal path based on the autocorrelation; providing a list of elements indicating past successful echo cancellation coefficients and associated repeater settings; and adaptively employing the echo cancellation coefficients to cancel the echo in the signal path. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
-
-
35. A wireless communication system, comprising:
-
a base station; and an on-frequency repeater for extending the base station coverage, wherein the on-frequency repeater comprises; an input antenna for receiving an input signal; an output antenna for outputting an amplified signal; an amplifier for amplifying the received input signal and providing the amplified output signal to the output antenna; and an internal feedback path for adaptively cancelling an echo between the input antenna and the output antenna and for stabilizing the on-frequency repeater, wherein the internal feedback path comprises; means for providing a list having a plurality of list elements, each list element comprising one or more echo cancellation parameters, and one or more repeater settings; means for monitoring a signal autocorrelation in the feedback path; and means for adaptively cancelling the echo based on the autocorrelation signal and the list. - View Dependent Claims (36, 37)
-
Specification