Method and arrangement for self interference cancellation
First Claim
1. A method in a relay for receiving an OFDM signal and forwarding the received OFDM signal comprising OFDM symbols of a wireless OFDM communication network including self-interference cancelling circuitry, wherein each received OFDM symbol to be forwarded is prefixed with a cyclic prefix, CP, being a copy of a part of the OFDM symbol, comprising the steps of:
- determining a delay for delaying an interference generating feedback signal such that an OFDM symbol of the interference generating feedback signal overlaps within a fraction of a length of the CP with an OFDM symbol of the received OFDM signal, the interference generating feedback signal including one or both of a self-interfering signal or a self-interference cancellation signal, wherein the fraction of the length of the CP is less than a whole length of the CP; and
delaying the interference generating feedback signal with the determined delay.
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Accused Products
Abstract
The present invention relates to a method and arrangement for receiving an OFDM signal and forwarding the received OFDM signal comprising OFDM symbols of a wireless OFDM communication network. The wireless OFDM communication network includes self-interference cancelling functionality and each received OFDM symbol to be forwarded is prefixed with a cyclic prefix (CP) which is a copy of the last part of the OFDM symbol. In the method a delay for delaying an interference generating feedback signal is determined such that an OFDM symbol of the interference generating feedback signal overlaps within a margin of a length of the CP with an OFDM symbol of the received OFDM signal, and interference generating feedback signal is delayed with the determined delay. Furthermore may the duration of the impulse be shortened as well.
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Citations
24 Claims
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1. A method in a relay for receiving an OFDM signal and forwarding the received OFDM signal comprising OFDM symbols of a wireless OFDM communication network including self-interference cancelling circuitry, wherein each received OFDM symbol to be forwarded is prefixed with a cyclic prefix, CP, being a copy of a part of the OFDM symbol, comprising the steps of:
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determining a delay for delaying an interference generating feedback signal such that an OFDM symbol of the interference generating feedback signal overlaps within a fraction of a length of the CP with an OFDM symbol of the received OFDM signal, the interference generating feedback signal including one or both of a self-interfering signal or a self-interference cancellation signal, wherein the fraction of the length of the CP is less than a whole length of the CP; and delaying the interference generating feedback signal with the determined delay. - View Dependent Claims (2, 4, 5, 6, 7, 8, 9, 10, 12)
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3. The method according to claim wherein the delaying step further comprises:
determining the delay for delaying the interference generating feedback signal such that an OFDM symbol of the interference generating feedback signal overlaps within a fraction of a length of the CP with a subsequent OFDM symbol of the received OFDM signal by introducing an additional delay of the interference generating feedback signal.
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11. The method according to claim wherein the relay is a frequency-translating relay.
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13. A relay for receiving an OFDM signal and forwarding the received OFDM signal comprising OFDM symbols of a wireless OFDM communication network including self-interference cancellation circuitry, wherein each received OFDM symbol is prefixed with a cyclic prefix, CP, being a copy of a part of the OFDM symbol, the relay comprising:
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a processing unit configured to determine a delay for delaying an interference generating feedback signal such that an OFDM symbol of the interference generating feedback signal overlaps within a fraction of a length of the CP with an OFDM symbol of the received OFDM signal, the interference generating feedback signal including one or both of self-interfering signal or a self-interference cancellation signal, wherein the fraction of the length of the CP is less than a whole length of the CP; and a delayer configured to delay the interference generating feedback signal with the determined delay. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification