TECHNICAL FIELD

The present disclosure relates generally to an electronic system and method, and, in particular embodiments, to an in device interference mitigation using sensor fusion.

BACKGROUND

Applications in the millimeter-wave (mmWave) frequency regime have gained significant interest in the past few years due to the rapid advancement in low cost semiconductor technologies, such as silicon germanium (SiGe) and fine geometry complementary metal-oxide semiconductor (CMOS) processes. Availability of high-speed bipolar and metal-oxide semiconductor (MOS) transistors has led to a growing demand for integrated circuits for millimeter-wave applications at 24 GHz, 60 GHz, 77 GHz, and 80 GHz and also beyond 100 GHz. Such applications include, for example, automotive radar systems and multi-gigabit communication systems.

In some radar systems, the distance between the radar and a target is determined by transmitting a frequency modulated signal, receiving a reflection of the frequency modulated signal (also referred to as the echo), and determining a distance based on a time delay and/or frequency difference between the transmission and reception of the frequency modulated signal. Accordingly, some radar systems include a transmit antenna to transmit the radio-frequency (RF) signal, and a receive antenna to receive the reflected RF signal, as well as the associated RF circuitry used to generate the transmitted signal and to receive the RF signal. In some cases, multiple antennas may be used to implement directional beams using phased array techniques. A multiple-input and multiple-output (MIMO) configuration with multiple chipsets can be used to perform coherent and non-coherent signal processing as well.

SUMMARY

In accordance with an embodiment, a method of interference mitigation in a device that includes a millimeter-wave radar, includes transmitting radar signals with the millimeter-wave radar; receiving reflected radar signals with the millimeter-wave radar, the reflected radar signals corresponding to the transmitted radar signals; generating a first spectrogram based on the reflected radar signals; generating a second spectrogram indicative of movement of a non-target object; generating a compensated radar spectrogram based on the first and second spectrograms to compensate for an influence of the movement of the non-target object in the first spectrogram; and detecting a target or a property of the target based on the compensated radar spectrogram.

In accordance with an embodiment, a device includes: a millimeter-wave radar configured to transmit radar signals and receive reflected radar signals, where the reflected radar signals correspond to the transmitted radar signals; and a controller configured to: generate a first spectrogram based on the reflected radar signals; generate a second spectrogram indicative of movement of a non-target object; generate a compensated radar spectrogram based on the first and second spectrograms to compensate for an influence of the movement of the non-target object in the first spectrogram; and detect a target or a property of the target based on the compensated radar spectrogram.

In accordance with an embodiment, a mobile device includes: a millimeter-wave radar configured to transmit radar signals and receive reflected radar signals, where the reflected radar signals correspond to the transmitted radar signals; a speaker; a microphone configured to measure an output of the speaker to generate a measured output; an enclosure at least partially surrounding the millimeter-wave radar, the speaker and the microphone; and a controller configured to: generate a first spectrogram based on the reflected radar signals; generate a second spectrogram based on the measured output; generate a compensated radar spectrogram based on the first and second spectrograms to compensate for an influence of the movement of the speaker or the enclosure in the first spectrogram; and detect a target or a property of the target based on the compensated radar spectrogram.

