Interference cancellation for backscattered reference signals
AssigneeQUALCOMM Incorporated
InventorsXiaojie Wang, Jing Sun, Mohammad Tarek Fahim, Srinivas Yerramalli
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Abstract
Disclosed are Techniques for wireless communication are provided. In an aspect, a radio frequency identification (RFID) device receives, from an RFID tag, a first backscattered signal, receives, from the RFID tag, a second backscattered signal having a known time offset relative to the first backscattered signal, and performs interference cancellation on the first backscattered signal based on the second backscattered signal.
Claims29
A method of wireless communication performed by a radio frequency identification (RFID) reader device, comprising:
- receiving, from an RFID tag, a first backscattered signal;
- receiving, from the RFID tag, a second backscattered signal having a known time offset relative to the first backscattered signal;
- and
- performing interference cancellation on the first backscattered signal based on the second backscattered signal.
A method of wireless communication performed by a radio frequency identification (RFID) tag, comprising:
- receiving, from a transmitter RFID reader device, a first interrogation signal;
- receiving, from the transmitter RFID reader device, a second interrogation signal;
- transmitting, to at least one receiver RFID reader device, a first backscattered signal;
- transmitting, to the at least one receiver RFID reader device, a second backscattered signal having a known time offset relative to the first backscattered signal;
- and
- receiving an information signal from the transmitter RFID reader device, the information signal including the known time offset.
A radio frequency identification (RFID) reader device, comprising:
- a memory;
- at least one transceiver;
- and
- at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to:
- receive, via the at least one transceiver, from an RFID tag, a first backscattered signal;
- receive, via the at least one transceiver, from the RFID tag, a second backscattered signal having a known time offset relative to the first backscattered signal;
- and
- perform interference cancellation on the first backscattered signal based on the second backscattered signal.
A radio frequency identification (RFID) tag, comprising:
- a memory;
- at least one transceiver;
- and
- at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to:
- receive, via the at least one transceiver, from a transmitter RFID reader device, a first interrogation signal;
- receive, via the at least one transceiver, from the transmitter RFID reader device, a second interrogation signal;
- transmit, via the at least one transceiver, to at least one receiver RFID reader device, a first backscattered signal;
- transmit, via the at least one transceiver, to the at least one receiver RFID reader device, a second backscattered signal having a known time offset relative to the first backscattered signal;
- and
- receive an information signal from the transmitter RFID reader device, the information signal including the known time offset.
Dependencies are inferred from the claim text.