Baseband transmitter self-jamming and intermodulation cancellation device
AssigneeQUALCOMM Incorporated
InventorsGurkanwal Sahota, Christos Komninakis
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Abstract
Some embodiments provide a method, system, and apparatus for interference cancellation at the baseband of a receiver. A wireless communication device, having a transmitter and receiver, is provided with an adaptive circuit that cancels interference caused by transmit signals (or other signals) leaked or bled onto the receiver at baseband to facilitate detection of a received signal of interest. Some implementations provide for a circuit that approximately reconstructs the second and third order components caused by the nonlinear response of the down-conversion chain of a receiver. This reconstructed signal is then subtracted from the composite received signal to obtain a received signal of interest.
Claims36
An apparatus for canceling intermodulation interference at baseband of a receiver, comprising:
- a reconstruction circuit configured to receive a first signal, approximate the linear and nonlinear characteristics of a leakage path from a transmitter to the receiver, and provide a reconstructed output signal;
- and
- a signal adder configured to receive the reconstructed output signal and subtract it from a second signal from the receiver.
An apparatus for canceling receiver intermodulation interference, comprising:
- means for receiving a composite signal having intermodulation interference and a receive signal at baseband;
- means for performing a linear and nonlinear conversion on a first signal to obtain an interference cancellation signal;
- and
- means for subtracting the interference cancellation signal from the composite signal to obtain the receive signal.
A method for canceling receiver intermodulation interference, comprising:
- receiving a composite signal having intermodulation interference and a receive signal at baseband;
- performing a linear and nonlinear conversion on a first signal to obtain an interference cancellation signal;
- and
- subtracting the interference cancellation signal from the composite signal to obtain the receive signal.
A transceiver comprising:
- an intermodulation cancellation circuit configured to
- receive a first transmit signal,
- apply a linear and nonlinear conversion to the first transmit signal to obtain an interference cancellation signal,
- receive a composite signal from a receiver down-conversion circuit, and
- subtract the interference cancellation signal from the composite signal to obtain a desired receive signal.
A machine-readable medium containing instructions for reconstructing and canceling intermodulation interference signals at baseband, when executed by a processor, cause the processor to perform operations comprising:
- apply a linear and nonlinear conversion to a first signal to obtain an interference cancellation signal;
- and
- subtract the interference cancellation signal from a composite signal to obtain a desired receive signal.
The machine-readable medium of 35 wherein the nonlinear conversion approximates the linear and nonlinear characteristics of a transmitter up-conversion circuit, and
- approximates the linear and nonlinear characteristics of a receiver down-conversion circuit.
Dependencies are inferred from the claim text.