ECHO CANCELLATION IN COMMUNICATION TRANSCEIVERS
First Claim
1. A method, comprising:
- in a transceiver, receiving from a repeater a received signal, which comprises a desired signal for reception and an undesired replica of a transmitted signal that was transmitted from the transceiver and retransmitted by the repeater;
generating in the transceiver a local copy of the transmitted signal;
matching the local copy with the undesired replica of the transmitted signal in the received signal, by adapting the received signal while retaining the local copy non-adaptive; and
canceling an interference caused by the undesired replica to the desired signal, by subtracting the local copy from the adapted received signal.
1 Assignment
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Accused Products
Abstract
A method includes, in a transceiver (28, 160), receiving from a repeater (32, 168) a received signal that includes a desired signal for reception and an undesired replica of a transmitted signal that was transmitted from the transceiver and retransmitted by the repeater. A local copy of the transmitted signal is generated in the transceiver. The local copy is matched with the undesired replica of the transmitted signal in the received signal, by adapting the received signal while retaining the local copy non-adaptive. An interference caused by the undesired replica to the desired signal is canceled, by subtracting the local copy from the adapted received signal.
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Citations
24 Claims
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1. A method, comprising:
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in a transceiver, receiving from a repeater a received signal, which comprises a desired signal for reception and an undesired replica of a transmitted signal that was transmitted from the transceiver and retransmitted by the repeater; generating in the transceiver a local copy of the transmitted signal; matching the local copy with the undesired replica of the transmitted signal in the received signal, by adapting the received signal while retaining the local copy non-adaptive; and canceling an interference caused by the undesired replica to the desired signal, by subtracting the local copy from the adapted received signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. Apparatus, comprising:
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a front end, which is configured to exchange signals with a repeater; and a modem, which is configured to receive from the repeater via the front end a received signal, which comprises a desired signal for reception and an undesired replica of a transmitted signal that was transmitted from the apparatus and retransmitted by the repeater, to generate a local copy of the transmitted signal, to match the local copy with the undesired replica of the transmitted signal in the received signal, by adapting the received signal while retaining the local copy non-adaptive, and to cancel an interference caused by the undesired replica to the desired signal, by subtracting the local copy from the adapted received signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method, comprising:
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in a transceiver, receiving from a repeater a received signal, which comprises a desired signal for reception and an undesired replica of a transmitted signal that was transmitted from the transceiver and retransmitted by the repeater; sampling the received signal using Intermediate Frequency (IF) sampling; using real-value signal processing operations, generating in the transceiver a local digital copy of the transmitted signal, matching the local copy with the undesired replica of the transmitted signal in the IF-sampled received signal, by adapting the received signal while retaining the local copy non-adaptive, and canceling an interference caused by the undesired replica to the desired signal, by subtracting the local copy from the adapted received signal.
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24. Apparatus, comprising:
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a front end, which is configured to exchange signals with a repeater; and a modem, which is configured to sample the received signal using Intermediate Frequency (IF) sampling, and, using real-value signal processing operations, to generate a local digital copy of the transmitted signal, to match the local copy with the undesired replica of the transmitted signal in the IF-sampled received signal, by adapting the received signal while retaining the local copy non-adaptive, and to cancel an interference caused by the undesired replica to the desired signal, by subtracting the local copy from the adapted received signal.
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Specification