Method and arrangement in a communication system
First Claim
1. A method in a relay node for cancelling self-interference, wherein the relay node is connected to at least two reception antennas that are each configured to receive wireless signals, the method comprises:
- receiving an analogue input signal from each respective reception antenna,converting each received analogue input signal into a digital signal,digitally processing each digital signal in a signal processing unit,extracting a respective digital cancellation signal from each respective digitally processed digital signal,combining and filtering the extracted digital cancellation signals in respective multi-input-single-output filters comprised within the relay node, to produce a number of combined digital cancellation signals, wherein said number corresponds to a number of said at least two reception antennas,converting each combined digital cancellation signal into an analogue cancellation signal, andsubtracting each analogue cancellation signal from the corresponding analogue input signal to obtain a respective corrected analogue input signal, which in turn is converted into a digital signal.
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Abstract
Method and arrangement in a relay node, for cancelling self-interference. The relay node is connected to one or more reception antennas, which reception antennas are configured to receive wireless signals. The method comprises receiving an analogue input signal, converting each received analogue input signal into a digital signal, processing the digital signal, extracting a cancellation signal from each respective digitally processed digital signal, combining and filtering the extracted cancellation signals into a number of combined cancellation signals, converting each combined cancellation signal into an analogue cancellation signal, and subtracting each analogue cancellation signal from the analogue input signal.
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Citations
11 Claims
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1. A method in a relay node for cancelling self-interference, wherein the relay node is connected to at least two reception antennas that are each configured to receive wireless signals, the method comprises:
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receiving an analogue input signal from each respective reception antenna, converting each received analogue input signal into a digital signal, digitally processing each digital signal in a signal processing unit, extracting a respective digital cancellation signal from each respective digitally processed digital signal, combining and filtering the extracted digital cancellation signals in respective multi-input-single-output filters comprised within the relay node, to produce a number of combined digital cancellation signals, wherein said number corresponds to a number of said at least two reception antennas, converting each combined digital cancellation signal into an analogue cancellation signal, and subtracting each analogue cancellation signal from the corresponding analogue input signal to obtain a respective corrected analogue input signal, which in turn is converted into a digital signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A relay node configured to cancel self-interference and connected to at least two reception antennas that are configured to receive wireless signals, the relay node comprising:
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at least two Radio Frequency receiver chains each configured to receive an analogue input signal from a respective reception antenna, at least two first converters each configured to convert a respective received analogue input signal into a digital signal, a signal processing circuit configured to digitally process each digital signal, an extraction circuit configured to extract a respective digital cancellation signal from each respective digitally processed digital signal, at least two multi-input-single-output filters each configured to combine the extracted digital cancellation signals to produce a respective combined digital cancellation signal, the number of combined digital cancellation signals corresponding to a number of said at least two reception antennas, at least two second converters each configured to convert a respective combined digital cancellation signal into a corresponding analogue cancellation signal; and a subtracting circuit configured to subtract each analogue cancellation signal from the corresponding analogue input signal, to obtain a respective corrected analogue input signal, which in turn is converted into a digital signal. - View Dependent Claims (9, 10, 11)
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Specification