Rogue vehicle detection and avoidance

    公开(公告)号:US10902726B2

    公开(公告)日:2021-01-26

    申请号:US16111041

    申请日:2018-08-23

    Abstract: Systems and methods for detecting rogue vehicles within a plurality of vehicles connected via a vehicular ad-hoc network (VANET) are provided. Sensors on each VANET vehicle provide host vehicle data and data associated with other nearby vehicles. Each VANET vehicle multicasts information that includes location, velocity, and preferred future travel path to the other VANET vehicles. Using data from sensors and data received from other VANET vehicles the host vehicle generates a dynamic set of safe vehicle operating behaviors. Nearby vehicles that do not comply with the determined safe vehicle operating behaviors or perform illegal/unsafe acts are identified as rogue vehicles. Data associated with identified rogue vehicles is transmitted to all VANET vehicles. Each VANET vehicle determines a preferred future travel path based on the received information associated with rogue vehicles, the preferred future travel path information received from other VANET vehicles, and the host vehicle's safe vehicle operating behaviors.

    Early-termination of decoding convolutional codes

    公开(公告)号:US10680749B2

    公开(公告)日:2020-06-09

    申请号:US15640476

    申请日:2017-07-01

    Abstract: A decoder having an input configured to receive a sequence of softbits presumed to correspond to a convolutionally-encoded codeword; and a decoding circuit configured to: determine, as part of a decoding process, a Maximum Likelihood (ML) survivor path in a trellis representation of the codeword; determine whether the presumed convolutionally-encoded codeword meets an early-termination criteria; and abort the decoding process if the presumed convolutionally-encoded codeword meets the early-termination criteria, continue the decoding process if the presumed convolutionally-encoded codeword fails to meet the early-termination criteria.

    Envelope detector-based feedback for radio frequency (RF) transmitters

    公开(公告)号:US10333764B1

    公开(公告)日:2019-06-25

    申请号:US16018731

    申请日:2018-06-26

    Abstract: A transmitter is provided to address transmitter non-idealities. The transmitter uses a series of envelope detectors to detect imbalances between an I branch and a Q branch of an I/Q modulator that is implemented as part of the transmitter's front end, and these detected imbalances may be compensated by pre-distorting digital baseband signals fed to the I branch and the Q branch. The transmitter may also use a series of envelope detectors to detect nonlinearities in one or more of the transmitter's amplification stages, and these detected nonlinearities may be compensated by modifying the baseband signals via a digital linearization pre-compensator. The transmitter may also support both implementations in either a time-switched or simultaneous manner, allowing for I/Q imbalances and nonlinearities to be addressed using a single transmitter design.

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