Concurrent operation of intelligent transportation system (ITS) radios in a same frequency band with a common antenna

Patent metadata

Field	Value
Publication number	US-11239875-B2
Application number	US-201816957129-A
Country	US
Kind code	B2
Filing date	Mar 30, 2018
Priority date	Mar 30, 2018
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

Methods and architectures are described to allow concurrent operation of two separate, non-synchronized, radio systems utilizing closely spaced frequency bands, such as IEEE 802.11p and LTE-V2X, or NR-V2X vehicular communications systems, with a common antenna. A full duplex-“like” active interference cancellation process may be employed that includes self-interference cancellation in the RF domain, in the analog domain and the digital baseband domain to reduce complexities and costs of stringent antenna isolation, otherwise required, for a simultaneous TX and RX mode of operation and concurrent RX mode of operation in closely spaced frequency resources.

First claim

What is claimed is:

1. A device for vehicular communications comprising:
a first intelligent transportation system (ITS) radio adapted to communicate with remote ITS nodes using a first communication protocol;
a second ITS radio adapted to communicate with remote ITS nodes over a second wireless channel in the same frequency band using a second communication protocol different from the first communication protocol;
a common antenna communicatively coupled to the first and second ITS radios enabling simultaneous unsynchronized transmit (TX) signals from, and receive (RX) signals to, both ITS radios; and
self-interference cancellation (SIC) circuitry adapted to reduce interference of desired RX signals at the first or second ITS radios due to communications by the opposite ITS radio using a combination of circuits arranged to provide passive RF isolation of respective radio signals at the common antenna, active analog radio frequency (RF) self-interference cancellation (RFSIC) and baseband self-interference cancellation.

2. The device of claim 1 wherein the circuit arranged to provide baseband self-interference cancellation is at least one of active analog baseband interference cancellation and digital baseband interference cancellation and configured to reduce unwanted components of interference signals of the opposite ITS radio by providing applying an inverse component of the respective analog or digital baseband signal to the desired RX signal.

3. The device of claim 1 wherein the SIC circuitry comprises:
a passive RF isolation device to isolate the first and second ITS radio couplings to the common antenna;
an active analog RF SIC circuit to mix a phase shifted analog RF cancellation signal to an RX signal received by the first or second ITS radios, the analog RF cancellation signal corresponding to a phase shifted version of an analog RF TX signal by the opposite ITS radio; and
a digital baseband SIC circuit to further cancel undesired components of the RX signal received by the first or second ITS radios.

4. The device of claim 1 wherein the SIC circuitry comprises:
a passive RF isolation device to isolate the first and second ITS radio couplings to the common antenna; and
an active analog baseband SIC circuit to mix inverse analog baseband cancellation signals to analog baseband RX signals received by one or both of the first and second ITS radios, the inverse analog baseband cancellation signals corresponding to a phase shifted version of the analog baseband RX signal intended for the opposite ITS radio.

5. The device of claim 1 wherein the circuit to provide passive RF isolation comprises a circulator.

6. The device of claim 1 wherein one of the first or second communication protocols is compatible with an Institute for Electrical and Electronics Engineer (IEEE) 802.11p vehicular communications protocol.

7. The device of claim 1 wherein one of the first or second communication protocols is compatible with a Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) or New Radio (NR) V2X vehicular communications protocol.

8. The device of claim 1 wherein the common antenna is coupled to the first ITS radio and the second ITS radio.

9. The device of claim 1 wherein the common antenna is physically coupled to the first ITS radio and the second ITS radio.

Assignees

• Intel Ip Corp
• Intel Corp

Inventors

• Faerber Michael
• Roth Kilian
• Saravanan Visvesh
• Gomes Baltar Leonardo

Classifications

• H04W88/06

  adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals · CPC title

• H04B1/3822

  specially adapted for use in vehicles (H04B1/3827 takes precedence) · CPC title

• H04B1/525 Primary

  with means for reducing leakage of transmitter signal into the receiver · CPC title

• H04B1/10

  Means associated with receiver for limiting or suppressing noise or interference · CPC title

• H04B1/44 Primary

  Transmit/receive switching · CPC title