A method and apparatus to identify an object include extracting first location information, second location information, and motion information of an object from a polarimetric RADAR signal that is reflected from the object. Each of the first location information, the second location information, and the motion information correspond to each of polarized waves. The apparatus and the method also include generating a first image and a second image, combining the first image and the second image to generate first composite images, each corresponding to each of the polarized waves, and identifying the object using a neural network based on the first composite images. The first image corresponds to each of the polarized waves and includes the first location information and the second location information, and the second image corresponds to each of the polarized waves and includes the first location information and the motion information.

A method of environmental sensing through pilot signals in a spread spectrum wireless communication system is provided with a plurality of wireless terminals. The plurality of wireless terminals includes a plurality of multi-input multi-output (MIMO) radars and at least one base station. The plurality of terminals broadcasts a beacon pilot signals containing a terminal-specific information and encoded with a corresponding identifier. Using the corresponding identifier, an arbitrary radar from the plurality of MIMO radars separates the beacon pilot signal from an ambient signal. More specifically, the arbitrary radar compares the ambient signal to the corresponding identifier of each wireless terminal to identify at least one origin terminal. Subsequently, the arbitrary radar extracts the terminal-specific information from the beacon pilot signal of the origin terminal. The terminal-specific information is used to exchange data between the plurality of wireless terminals for autonomous driving.

A reconfigurable radar unit is described that includes: a millimetre wave (mmW) transceiver (Tx/Rx) circuit; a mixed analog and baseband integrated circuit; and a signal processor circuit. The mmW Tx/Rx circuit and mixed analog and baseband integrated circuit and signal processor circuit are configured to support a plurality of radar operational modes. a radar sensitivity monitor and architecture reconfiguration control unit (260) is coupled to the signal processor circuit and is configured to monitor a radar performance and, in response thereto, initiate a change in the radar operational mode. In this manner, a large number of radar operational modes is supported and can be dynamically adopted by the reconfigurable radar unit dependent upon any prevailing radar performance condition.

A millimeter or mm-wave system includes transmission of a millimeter wave (mm-wave) radar signal by a transmitter to an object. The transmitted mm-wave radar signal may include at least two signal orientations, and in response to each signal orientation, the object reflects corresponding signal reflections. The signal reflections are detected and a determination is made as to location of the object.

Methods, systems, and devices for wireless communication are described. In one example, phase-noise compensation tracking signals (PTRS) may be transmitted using sets of resource blocks (RBs), where a frequency for each PTRS within the sets RBs is different from a frequency corresponding to a direct current (DC) tone. In another example, a time-domain-based PTRS may be used, where a discrete Fourier transform (DFT)-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) symbol may include a cyclic prefix and a PTRS inserted in the DFT-s-OFDM symbol. Additionally or alternatively, a guard-interval-based DFT-s-OFDM symbol may include a PTRS that replaces part or all of a guard interval. In some examples, subsets of tones used for PTRS across a system bandwidth may be transmitted using a scrambled modulation symbol, where at least one antenna port may be used for the transmission of PTRS.

A signal processing system includes a transmission module and a receiving module. The transmission module generates and transmits a transmitted radio frequency signal according to a data signal and a first spread vector. The transmission module includes a spread spectrum unit, a digital-to-analog converter and a mixer. The spread spectrum unit generates a spread spectrum signal according to the data signal and the first spread vector. The digital-to-analog unit generates an analog signal according to the spread spectrum signal. The mixer mixes the analog signal and a carrier signal so as to generate the transmitted radio frequency signal. The receiving module receives a received radio frequency signal and a second spread vector so as to generate a spectrum despread signal and generate object detection information data accordingly. The received radio frequency signal is generated by having the transmitted radio frequency signal reflected by a measured object.

A method for attenuating a leakage signal in an FMCW radar system and a radar system thereof are provided. The method includes concentrating a phase noise of the leakage signal on a stationary point and attenuating the phase noise based on the concentration of the phase noise on the stationary point.

A system comprises a multifunction radar receiver that in turn comprises processing circuitry and front-end circuitry. The front-end circuitry is operable to receive a millimeter wave burst via a plurality of antennas to generate a plurality received signals. The processing circuitry is operable to receive a first scene representation that is an aggregate of scene representations generated by one or more other radar receivers. The processing circuitry is operable to process the received signals to generate a second scene representation. The processing circuitry is operable to compare the first scene representation and the second scene representation and generate a difference scene based on the comparison. The processing circuitry is operable to generate a control signal based on the difference scene.

Synthetic aperture radar (SAR) imaging systems that transmit repeated waveforms based upon pseudonoise sequences to generate SAR imaging data in accordance with various embodiments of the invention are disclosed. A synthetic aperture radar in accordance with one embodiment of the invention includes: a transmitter configured to transmit superchirps, where the superchirp is generated by convolving a kernel with a pseudonoise modulated impulse sequence having a flat power spectrum; a receiver configured to receive backscatters of transmitted superchirps and digitize the received backscatters; and signal processing circuitry configured to perform matched filtering on digitized backscatters.

Described embodiments provide sidelobe cancellation for Simultaneous Transmit and Receive systems. The sidelobe cancellation system includes an array having a primary aperture and an auxiliary array. The auxiliary array includes a plurality of antenna elements disposed adjacent to at least one side of the primary aperture. Each element of the auxiliary array is coupled to a variable attenuator, a variable phase shifter or a variable true time delay unit. A controller tunes the auxiliary array to cancel sidelobes of the primary aperture by adaptively selecting an attenuation value of the variable attenuator, a phase shift value of the variable phase shifter and a time delay value of the variable true time delay unit for each element of the auxiliary array. The auxiliary array operates as an adaptive finite-impulse response (FIR) filter with each antenna element of the auxiliary array operating as an adaptive tap of the adaptive FIR filter.