Transmit energy leakage control in a receiver
First Claim
1. A transceiver comprising:
- transmit section, the transmit section generating a transmit signal;
a receive section;
a leakage path between the transmit section and receive section, such that at least some of the transmit signal is coupled to the receive section through the leakage path; and
an interference control section, comprising;
a first input coupled to the transmit section, wherein a signal received at the first input is a reference baseband transmission signal (RBTS);
a second input coupled to the receive section, wherein a signal received at the second input comprises a receive signal and a transmit interference signal from the leakage path;
one or more adaptive filters configured to generate an interference control signal based on the RBTS and a model of the leakage path, wherein the model of the leakage path is based on a first approximation of a transfer function for the leakage path;
circuitry for combining the generated interference control signal with the signal received at the second input, thereby generating an output signal; and
an output coupled to the receive section and configured to output the output signal, wherein the interference control section further comprises a third input for receiving a gain control signal generated by a transceiver controller.
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Accused Products
Abstract
Systems and methods for removing interference from a received signal. A model of a leakage path from a transmit section to a receive section is used to assist in designing a set of iterative filters to remove interference. Modeling the leakage path allows generation of the first approximation of the transfer function of the leakage path traversed by the signals coupled from the transmit section to the receive section. The first approximation narrows down the universe of possible distortions that might occur due to the transfer function of the leakage path. Narrowing down the universe of possible solutions makes the complexity of the interference control section more manageable. An iterative LMS function is used to further refine the coefficients of the adaptive filters.
25 Citations
18 Claims
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1. A transceiver comprising:
transmit section, the transmit section generating a transmit signal;
a receive section;
a leakage path between the transmit section and receive section, such that at least some of the transmit signal is coupled to the receive section through the leakage path; and
an interference control section, comprising;
a first input coupled to the transmit section, wherein a signal received at the first input is a reference baseband transmission signal (RBTS);
a second input coupled to the receive section, wherein a signal received at the second input comprises a receive signal and a transmit interference signal from the leakage path;
one or more adaptive filters configured to generate an interference control signal based on the RBTS and a model of the leakage path, wherein the model of the leakage path is based on a first approximation of a transfer function for the leakage path;
circuitry for combining the generated interference control signal with the signal received at the second input, thereby generating an output signal; and
an output coupled to the receive section and configured to output the output signal, wherein the interference control section further comprises a third input for receiving a gain control signal generated by a transceiver controller.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
Specification