APPARATUS, SYSTEM AND METHOD OF LEAKAGE CANCELLATION FOR MULTIPLE INPUT MULTIPLE OUTPUT (MIMO) RADAR

• US 20200132805A1
• Filed: 12/27/2019
• Published: 04/30/2020
• Est. Priority Date: 12/27/2019
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Lehne, Mark A., Ohev Zion, Dan, Cohen, Alon, Amadjikpe, Arnaud
• Granted Patent: US 11,372,081 B2
• Time in Patent Office: Days
• CPC Class Codes: G01S 13/42 Simultaneous measurement of distance and other co-ordinates indirect measurement G01S13/46
• CPC Class Codes: G01S 13/931 of land vehicles
• CPC Class Codes: G01S 7/038 Feedthrough nulling circuits

Abstract

For example, a MIMO radar may include a plurality of Tx chains to process a plurality of digital Tx signals for transmission of a plurality of Tx RF signals; a plurality of Rx chains configured to output a plurality of digital Rx signals based on a plurality of Rx RF signals and a plurality of digital leakage-cancellation signals, wherein an Rx chain of the plurality of Rx chains is configured to output a digital Rx signal based on an Rx RF signal and a digital leakage-cancellation signal corresponding to the Rx chain; and a digital MIMO filter to generate the plurality of digital leakage-cancellation signals based on the plurality of digital Tx signals, the digital MIMO filter configured to generate the digital leakage-cancellation signal corresponding to the Rx chain by applying to the plurality of digital Tx signals a respective plurality of filters corresponding to the Rx chain.

Claims

1. An apparatus comprising a Multiple-Input-Multiple Output (MIMO) radar, the MIMO radar comprising:

a plurality of Transmit (Tx) chains to process a plurality of digital Tx signals for transmission of a plurality of Tx Radio Frequency (RF) signals via a plurality of Tx antennas;

a plurality of Receive (Rx) chains configured to output a plurality of digital Rx signals based on a plurality of Rx RF signals and a plurality of digital leakage-cancellation signals, the plurality of Rx RF signals to be received via a plurality of Rx antennas, wherein an Rx chain of the plurality of Rx chains is configured to output a digital Rx signal of the plurality of digital Rx signals based on an Rx RF signal of the plurality of Rx RF signals and a digital leakage-cancellation signal corresponding to the Rx chain; and

a digital MIMO filter to generate the plurality of digital leakage-cancellation signals based on the plurality of digital Tx signals, the digital MIMO filter configured to generate the digital leakage-cancellation signal corresponding to the Rx chain by applying to the plurality of digital Tx signals a respective plurality of filters corresponding to the Rx chain.

2. The apparatus of claim 1, wherein the Rx chain comprises:

a Digital to Analog Converter (DAC) to convert the digital leakage-cancellation signal corresponding to the Rx chain into an analog leakage-cancellation signal; and

an analog signal combiner to combine the analog leakage-cancellation signal with an analog Rx signal, which is based on the Rx RF signal.

3. The apparatus of claim 2, wherein the analog signal combiner is configured to combine the analog leakage-cancellation signal with the analog Rx signal in an RF section of the Rx chain.

4. The apparatus of claim 3, wherein the analog signal combiner is configured to combine the analog leakage-cancellation signal with the analog Rx signal at a mixer output of the Rx chain.

5. The apparatus of claim 3, wherein the analog signal combiner is configured to combine the analog leakage-cancellation signal with the analog Rx signal at an input to a Low Noise Amplifier (LNA) of the Rx chain.

6. The apparatus of claim 3, wherein the analog signal combiner is configured to combine the analog leakage-cancellation signal with the analog Rx signal after a Low Noise Amplifier (LNA) of the Rx chain.

7. The apparatus of claim 2, wherein the analog signal combiner is configured to combine the analog leakage-cancellation signal with the analog Rx signal in a baseband section of the Rx chain.

8. The apparatus of claim 2, wherein the analog signal combiner comprises a signal coupler or a signal transformer.

9. The apparatus of claim 1, wherein the digital MIMO filter comprises an adaptive MIMO filter configured to dynamically adapt coefficients of the plurality of filters corresponding to the Rx chain based on range-Doppler response information from a radar processor.

10. The apparatus of claim 9, wherein the adaptive MIMO filter is configured to dynamically adapt the coefficients of the plurality of filters corresponding to the Rx chain based on a range-Doppler response bin comprising a zero Doppler value and a smallest range value compared to other range-Doppler response bins comprising the zero Doppler value.

11. The apparatus of claim 1, wherein the plurality of filters corresponding to the Rx chain comprises a plurality of preconfigured filters, a preconfigured filter of the plurality of preconfigured filters comprising a plurality of preset filter coefficients.

12. The apparatus of claim 1, wherein coefficients of the plurality of filters corresponding to the Rx chain are based on an Rx impulse response of the Rx chain, a plurality of Tx impulse responses of the plurality of Tx chains, and a plurality of leakage impulse responses between the plurality of Tx antennas and an Rx antenna corresponding to the Rx chain.

13. The apparatus of claim 1, wherein the digital MIMO filter is configured to generate the digital leakage-cancellation signal corresponding to the Rx chain to reduce leakage from the plurality of Tx antennas to the Rx chain.

14. The apparatus of claim 1 comprising the plurality of Tx antennas and the plurality of Rx antennas.

15. The apparatus of claim 1 comprising a radar processor configured to determine a range-Doppler response based on the plurality of digital Rx signals.

16. A Multiple-Input-Multiple Output (MIMO) radar comprising:

a plurality of Transmit (Tx) antennas;

a plurality of Receive (Rx) antennas;

a plurality of Tx chains to process a plurality of digital Tx signals for transmission of a plurality of Tx Radio Frequency (RF) signals via the plurality of Tx antennas;

a plurality of Rx chains configured to output a plurality of digital Rx signals based on a plurality of Rx RF signals and a plurality of digital leakage-cancellation signals, the plurality of Rx RF signals to be received via the plurality of Rx antennas, wherein an Rx chain of the plurality of Rx chains is configured to output a digital Rx signal of the plurality of digital Rx signals based on an Rx RF signal of the plurality of Rx RF signals and a digital leakage-cancellation signal corresponding to the Rx chain;

a digital MIMO filter to generate the plurality of digital leakage-cancellation signals based on the plurality of digital Tx signals, the digital MIMO filter configured to generate the digital leakage-cancellation signal corresponding to the Rx chain by applying to the plurality of digital Tx signals a respective plurality of filters corresponding to the Rx chain; and

a radar processor configured to determine range-Doppler response information based on the plurality of digital Rx signals.

17. The MIMO radar of claim 16, wherein the Rx chain comprises:

a Digital to Analog Converter (DAC) to convert the digital leakage-cancellation signal corresponding to the Rx chain into an analog leakage-cancellation signal; and

an analog signal combiner to combine the analog leakage-cancellation signal with an analog Rx signal, which is based on the Rx RF signal.

18. The MIMO radar of claim 17, wherein the digital MIMO filter comprises an adaptive MIMO filter configured to dynamically adapt coefficients of the plurality of filters corresponding to the Rx chain based on the range-Doppler response information from the radar processor.

19. The MIMO radar of claim 18, wherein the adaptive MIMO filter is configured to dynamically adapt the coefficients of the plurality of filters corresponding to the Rx chain based on a range-Doppler response bin comprising a zero Doppler value and a smallest range value compared to other range-Doppler response bins comprising the zero Doppler value.

20. The MIMO radar of claim 17, wherein the plurality of filters corresponding to the Rx chain comprises a plurality of preconfigured filters, a preconfigured filter of the plurality of preconfigured filters comprising a plurality of preset filter coefficients.

21. The MIMO radar of claim 17, wherein coefficients of the plurality of filters corresponding to the Rx chain are based on an Rx impulse response of the Rx chain, a plurality of Tx impulse responses of the plurality of Tx chains, and a plurality of leakage impulse responses between the plurality of Tx antennas and an Rx antenna corresponding to the Rx chain.

22. A vehicle comprising:

a Multiple-Input-Multiple Output (MIMO) radar configured to generate radar information, the MIMO radar comprising;

a plurality of Transmit (Tx) antennas;

a plurality of Receive (Rx) antennas;

a plurality of Tx chains to process a plurality of digital Tx signals for transmission of a plurality of Tx Radio Frequency (RF) signals via the plurality of Tx antennas;

a plurality of Rx chains configured to output a plurality of digital Rx signals based on a plurality of Rx RF signals and a plurality of digital leakage-cancellation signals, the plurality of Rx RF signals to be received via the plurality of Rx antennas, wherein an Rx chain of the plurality of Rx chains is configured to output a digital Rx signal of the plurality of digital Rx signals based on an Rx RF signal of the plurality of Rx RF signals and a digital leakage-cancellation signal corresponding to the Rx chain;

a digital MIMO filter to generate the plurality of digital leakage-cancellation signals based on the plurality of digital Tx signals, the digital MIMO filter configured to generate the digital leakage-cancellation signal corresponding to the Rx chain by applying to the plurality of digital Tx signals a respective plurality of filters corresponding to the Rx chain; and

a radar processor configured to determine the radar information based on the plurality of digital Rx signals; and

a system controller configured to control one or more vehicular systems of the vehicle based on the radar information.

23. The vehicle of claim 22, wherein the Rx chain comprises:

a Digital to Analog Converter (DAC) to convert the digital leakage-cancellation signal corresponding to the Rx chain into an analog leakage-cancellation signal; and

an analog signal combiner to combine the analog leakage-cancellation signal with an analog Rx signal, which is based on the Rx RF signal.

24. The vehicle of claim 22, wherein the digital MIMO filter comprises an adaptive MIMO filter configured to dynamically adapt coefficients of the plurality of filters corresponding to the Rx chain based on the radar information from the radar processor.

25. The vehicle of any claim 22, wherein coefficients of the plurality of filters corresponding to the Rx chain are based on an Rx impulse response of the Rx chain, a plurality of Tx impulse responses of the plurality of Tx chains, and a plurality of leakage impulse responses between the plurality of Tx antennas and an Rx antenna corresponding to the Rx chain.