IDENTIFICATION OF SELF JAMMER TONE FOR SUPPRESSION THEREOF IN RFID SYSTEMS OR THE LIKE
First Claim
Patent Images
1. A self jammer suppressor circuit for a radio-frequency identification transceiver, comprising:
- a pilot tone generator to embed a pilot tone on a carrier signal to be transmitted via a transmitter chain;
a phase shifter circuit coupled between the transmitter chain and a receiver chain to provide a version of the transmitted signal to the receiver chain to be combined with a signal received on the receiver chain; and
a peak detector and pilot tone detection circuit coupled to the receiver chain to detect a self jammer signal present in the received signal by detecting the pilot tone in the received signal;
wherein the phase shifter circuit shifts the phase of the version of the transmitted signal in response to detection of the pilot tone in the received signal by the peak detector and pilot tone detection circuit to suppress the self jammer signal from the received signal.
1 Assignment
0 Petitions
Accused Products
Abstract
Briefly, in accordance with one or more embodiments, a self jammer may be detected and suppressed from a received signal by embedding a pilot tone in the transmitted signal and then detecting the pilot tone in the received signal. Detection of the pilot tone in the received signal indicates the presence of a self jammer. A phase shifted and attenuated version of the transmitted signal may be combined with the received signal to suppress and/or cancel the self jammer signal from the received signal.
25 Citations
14 Claims
-
1. A self jammer suppressor circuit for a radio-frequency identification transceiver, comprising:
-
a pilot tone generator to embed a pilot tone on a carrier signal to be transmitted via a transmitter chain; a phase shifter circuit coupled between the transmitter chain and a receiver chain to provide a version of the transmitted signal to the receiver chain to be combined with a signal received on the receiver chain; and a peak detector and pilot tone detection circuit coupled to the receiver chain to detect a self jammer signal present in the received signal by detecting the pilot tone in the received signal; wherein the phase shifter circuit shifts the phase of the version of the transmitted signal in response to detection of the pilot tone in the received signal by the peak detector and pilot tone detection circuit to suppress the self jammer signal from the received signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method to suppress a self jammer signal in a radio-frequency identification transceiver, comprising:
-
embedding a pilot tone on a carrier signal to be transmitted via a transmitter chain; providing a version of the transmitted signal to the receiver chain to be combined with a signal received on the receiver chain by phase shifting the version of the transmitted signal; and detecting a self jammer signal present in the received signal by detecting the pilot tone in the received signal; wherein the amount of phase shift in the version of the transmitted signal is adjusted in response to the detection of the pilot tone in the received signal to suppress the self jammer signal from the received signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
Specification