Methods and apparatuses for detecting and reducing non-linear echo in a multi-carrier communication system
First Claim
Patent Images
1. A method, comprising:
- establishing a training period between a first transmitter-receiver device and a second transmitter-receiver device in a discrete multiple tone system that separates communication signals into two or more distinct frequency bands;
detecting for an echo generated by a non-linear element present on a transmission medium during the training period;
comparing relative noise contribution between the echo and ambient noise present on the transmission medium; and
eliminating a noise contribution from the echo if the relative noise contribution is higher than a threshold value.
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Abstract
Apparatuses, systems, and methods for a multi-carrier communication system that detects and reduces an echo from a non-linear element present on the transmission medium. In an embodiment, a training period is established between a first transmitter-receiver device and a second transmitter-receiver device in the discrete multiple tone system that separates communication signals into two or more separate frequency bands. Noise caused by an echo generated by a non-linear element present on the transmission medium is detected during the training period. The significance of the non-linear echo contribution to the overall ambient noise level present in the system may be determined.
36 Citations
21 Claims
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1. A method, comprising:
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establishing a training period between a first transmitter-receiver device and a second transmitter-receiver device in a discrete multiple tone system that separates communication signals into two or more distinct frequency bands; detecting for an echo generated by a non-linear element present on a transmission medium during the training period; comparing relative noise contribution between the echo and ambient noise present on the transmission medium; and eliminating a noise contribution from the echo if the relative noise contribution is higher than a threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A machine readable medium storing instructions to cause the machine to perform the following operations, comprising:
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establishing a training period between a first transmitter-receiver device and a second transmitter-receiver device in a discrete multiple tone system that separates communication signals into two or more distinct frequency bands; detecting for noise caused by an echo generated by a non-linear element present on a transmission medium during the training period; comparing relative noise contribution between the echo and ambient noise present on the transmission medium;
andeliminating a noise contribution from the echo if the relative noise contribution is higher than a threshold value. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. An apparatus, comprising:
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means for establishing a training period between a first transmitter-receiver device and a second transmitter-receiver device in a discrete multiple tone system that separates communication signals into two or more distinct frequency bands; means for detecting for noise caused by an echo generated by a non-linear noise source present on a transmission medium during the training period; means for comparing relative noise contribution between the echo and ambient noise present on the transmission medium; and means for eliminating a noise contribution from the echo if the relative noise contribution is higher than a threshold value. - View Dependent Claims (17, 18)
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19. An apparatus, comprising:
a transmitter-receiver device, wherein the receiver portion contains a frequency filter and a non-linear echo detector to detect for the presence of an echo generated by a non-linear element, wherein the receiver portion compares relative noise contribution between the echo and ambient noise present on a transmission medium, and wherein the transmitter portion eliminates a noise contribution from the echo if the relative noise contribution is higher than a threshold amount. - View Dependent Claims (20, 21)
Specification