Rejecting interference for simultaneous received signals
First Claim
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6. A device comprising:
- an Analog-to-Digital Converter (ADC) to convert data received in a receiver path;
a Digital-to-Analog Converter (DAC) to convert data to be transmitted in a transmitter path;
a cancellation circuit having a first input coupled to an input of the DAC and a second input coupled to an output of the ADC, wherein the cancellation circuit injects an out-of-phase signal into the receiver path to cancel at least a portion of interference from the transmitter path.
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Abstract
A wireless data system for reducing interference where simultaneous transmission and reception may occur in the same frequency band. A transmitter may include a Digital-to-Analog Converter (DAC), an up converter to prepare a digital value for transmission. A receiver may include a subtractor circuit, a down converter, an Analog-to-Digital Converter (ADC) to prepare a received analog signal for storage as a digital value. The wireless data system includes an adaptive interface cancellation circuit to generate a delayed replica signal of the original transmitted signal. The subtractor circuit may inject an out-of-phase signal into the receiver front end to cancel the interference in the received signal.
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Citations
20 Claims
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6. A device comprising:
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an Analog-to-Digital Converter (ADC) to convert data received in a receiver path;
a Digital-to-Analog Converter (DAC) to convert data to be transmitted in a transmitter path;
a cancellation circuit having a first input coupled to an input of the DAC and a second input coupled to an output of the ADC, wherein the cancellation circuit injects an out-of-phase signal into the receiver path to cancel at least a portion of interference from the transmitter path. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A system comprising:
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a transmit path to receive transmitter digital data to convert to a transmitter analog signal;
a receive path to receive a receiver analog signal to convert to receiver digital data; and
a cancellation circuit having inputs to receive the transmitter digital data and the receiver digital data and generate an out-of-phase signal to inject into the receiver path to cancel at least a portion of interference from the transmitter path. - View Dependent Claims (1, 2, 3, 4, 5, 13, 14, 15, 16)
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15-1. The system of claim 12 wherein the receive path further includes:
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a first antenna coupled to an output of the DAC to provide Bluetooth and IEEE 802.11b signals; and
a second antenna coupled to an input of the ADC to receive signals for Bluetooth and IEEE 802.11b.
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17. A method comprising:
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converting a first digital value to an analog signal in a transmitter;
converting a signal received by a receiver that contains a portion of the analog signal as interference to a second digital value; and
processing the first and second digital values to generate a signal that mitigates the interference in the signal converted by the receiver. - View Dependent Claims (18, 19, 20)
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Specification