ADJUSTING PARAMETERS ASSOCIATED WITH TRANSMITTER LEAKAGE
First Claim
1. A method for reducing noise, comprising:
- sampling, on a receiver path, Radio Frequency (RF) signal including a signal received from a transponder and an interference signal, the interference signal based, at least in part, on an RF transmission signal;
dynamically adjusting a portion of the RF transmission signal based, at least in part, on the sampled signal; and
combining the adjusted portion of the RF transmission signal into receive path to reduce the interference signal.
4 Assignments
0 Petitions
Accused Products
Abstract
An apparatus comprises a transmitter, a receiver, an antenna and a signal cancellation circuit. The transmitter is configured to send a transmitter signal associated with a frequency. The receiver is associated with the frequency. The antenna is coupled to the transmitter and the receiver. The signal cancellation circuit is coupled to the transmitter, the receiver and the antenna. The signal cancellation circuit is configured to phase shift a first portion of the transmitter signal to produce a phase-shifted signal. The signal cancellation circuit is configured to combine the phase-shifted signal with a second portion of the transmitter signal to produce a combined signal. The second portion of the transmitter signal is associated with a reflection of a third portion of the transmitter signal from the antenna. The first portion, the second portion and the third portion of the transmitter signal are different from each other.
167 Citations
22 Claims
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1. A method for reducing noise, comprising:
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sampling, on a receiver path, Radio Frequency (RF) signal including a signal received from a transponder and an interference signal, the interference signal based, at least in part, on an RF transmission signal;
dynamically adjusting a portion of the RF transmission signal based, at least in part, on the sampled signal; and
combining the adjusted portion of the RF transmission signal into receive path to reduce the interference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 22)
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11. An RF reader, comprising:
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a detector configured to sample, on a receive path, an Radio Frequency (RF) signal including a signal received from a transponder and an interference signal, the interference signal based, at least in part, on a RF transmission signal;
a control element configured to dynamically adjust a portion of the RF transmission signal based, at least in part, on the sampled signal; and
a coupler configured to combine the adjusted portion of the RF transmission signal to the receive path to reduce the interference signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification