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公开(公告)号：US20230273307A1
公开(公告)日：2023-08-31
申请号：US18313662
申请日：2023-05-08
Applicant: NXP B.V.
Inventor： Abdul Wahid Abdul Kareem , Radha Srinivasan , Brima Babatunde Ibrahim
IPC: G01S13/10 , H04B1/7163 , G01S7/02 , G01S7/03 , G01S13/02
CPC classification number: G01S13/106 , H04B1/71632 , G01S7/024 , G01S7/038 , G01S13/0209 , H04B2201/71634
Abstract: A method is provided for radar ranging using an IR-UWB radar transceiver. The range is determined by measuring a time required by a transmitted pulse to be reflected by an object and returned to the transceiver. The method includes transmitting a ranging signal having a predetermined sequence of positive and negative pulses using a transmitter of the transceiver. A receiver of the transceiver receives a signal having a reflected portion and a feedthrough portion. In the method, the receiver cancels the feedthrough portion using a delayed pulse polarity signal such that when the delayed pulse polarity signal is multiplied and accumulated with the received signal, the feedthrough portion is canceled, and the reflected portion is amplified. In another embodiment, a transceiver is provided that cancels the feedthrough portion while amplifying the reflected portion. Cancelling the feedthrough portion allows short-range operation by removing a blind range of the transceiver.
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公开(公告)号：US10574281B1
公开(公告)日：2020-02-25
申请号：US16236272
申请日：2018-12-28
Applicant: NXP B.V.
Inventor： Ulrich Andreas Muehlmann , Radha Srinivasan , Stefan Mendel
Abstract: A device includes a near field communication (NFC) module for generating an electromagnetic carrier signal and modulating the carrier signal according to data to be transmitted, and an antenna coupled to and driven by the NFC module with the modulated carrier signal. The device includes an analog front end coupled between the NFC module and the antenna. The device further includes a digital gain control (DGC) block for controlling gains in a first and second baseband amplifiers (BBAs). The DGC block includes a first clipping detector for correlating in-phase input signals with a subcarrier pattern and a second clipping detector for correlating quadrature input signals with the subcarrier pattern, and further includes a signal energy correction block adapted to output a number of correction ticks for a numerically controlled oscillator (NCO) based on a number of gain updates performed for the first or the second BBAs.
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公开(公告)号：US11025295B2
公开(公告)日：2021-06-01
申请号：US16594557
申请日：2019-10-07
Applicant: NXP B.V.
Inventor： Amit Kumar Dutta , Radha Srinivasan , Mohammad Areef
Abstract: There is described a method of determining an MRC coefficient vector for a RAKE receiver. The method comprises (a) estimating a channel impulse response vector, (b) estimating a noise variance vector, (c) calculating a multiplication factor vector based on the estimated channel impulse response vector and the estimated noise variance vector, (d) calculating a modified channel impulse response vector by multiplying each element in the estimated channel response vector with a corresponding element in the multiplication factor vector, and (e) calculating the MRC coefficient vector as the complex conjugate of the modified channel impulse response vector. There is also described a corresponding device, an UWB receiver, a computer program and a computer program product.
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公开(公告)号：US20200383052A1
公开(公告)日：2020-12-03
申请号：US16428595
申请日：2019-05-31
Applicant: NXP B.V.
Inventor： Jun Zhou , Radha Srinivasan , Brima Babatunde Ibrahim
IPC: H04W52/02 , H04L25/02 , H04B1/7163
Abstract: Embodiments of a method and a device are disclosed. In an embodiment, a method for operating an ultra-wideband (UWB) device is disclosed. The method involves powering down a first receive path of a multipath UWB device while leaving a second receive path of the multipath UWB device powered up, powering down channel estimation, tracking, and demodulation functions of the second receive path, and performing an acquisition function using the second receive path while the first receive path is powered down and while the channel estimation, tracking, and demodulation functions of the second receive path are powered down.
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公开(公告)号：US12204011B2
公开(公告)日：2025-01-21
申请号：US18313662
申请日：2023-05-08
Applicant: NXP B.V.
Inventor： Abdul Wahid Abdul Kareem , Radha Srinivasan , Brima Babatunde Ibrahim
IPC: G01S13/10 , G01S7/02 , G01S7/03 , G01S13/02 , H04B1/7163
Abstract: A method is provided for radar ranging using an IR-UWB radar transceiver. The range is determined by measuring a time required by a transmitted pulse to be reflected by an object and returned to the transceiver. The method includes transmitting a ranging signal having a predetermined sequence of positive and negative pulses using a transmitter of the transceiver. A receiver of the transceiver receives a signal having a reflected portion and a feedthrough portion. In the method, the receiver cancels the feedthrough portion using a delayed pulse polarity signal such that when the delayed pulse polarity signal is multiplied and accumulated with the received signal, the feedthrough portion is canceled, and the reflected portion is amplified. In another embodiment, a transceiver is provided that cancels the feedthrough portion while amplifying the reflected portion. Cancelling the feedthrough portion allows short-range operation by removing a blind range of the transceiver.
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Patent Agency Ranking
公开(公告)号：US11686833B2
公开(公告)日：2023-06-27
申请号：US17082104
申请日：2020-10-28
Applicant: NXP B.V.
Inventor： Abdul Wahid Abdul Kareem , Radha Srinivasan , Brima Babatunde Ibrahim
IPC: G01S13/10 , H04B1/7163 , G01S7/02 , G01S7/03 , G01S13/02
CPC classification number: G01S13/106 , G01S7/024 , G01S7/038 , G01S13/0209 , H04B1/71632 , H04B2201/71634
Abstract: A method is provided for radar ranging using an IR-UWB radar transceiver. The range is determined by measuring a time required by a transmitted pulse to be reflected by an object and returned to the transceiver. The method includes transmitting a ranging signal having a predetermined sequence of positive and negative pulses using a transmitter of the transceiver. A receiver of the transceiver receives a signal having a reflected portion and a feedthrough portion. In the method, the receiver cancels the feedthrough portion using a delayed pulse polarity signal such that when the delayed pulse polarity signal is multiplied and accumulated with the received signal, the feedthrough portion is canceled, and the reflected portion is amplified. In another embodiment, a transceiver is provided that cancels the feedthrough portion while amplifying the reflected portion. Cancelling the feedthrough portion allows short-range operation by removing a blind range of the transceiver.
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公开(公告)号：US10992419B1
公开(公告)日：2021-04-27
申请号：US16816993
申请日：2020-03-12
Applicant: NXP B.V.
Inventor： Jun Zhou , Shengyang Xu , Abdul Wahid Abdul Kareem , Radha Srinivasan , Brima Babatunde Ibrahim
IPC: H04B7/04 , H04L1/06 , H04L27/26 , H04B7/0413 , H04L5/00 , H04L25/02 , H04W24/10 , H04B7/06 , H04W72/04
Abstract: A method and device using a single transmitter (TX) and/or a single receiver (RX) is provided for determining an angle measurement between the transmitter and receiver for an ultra-wideband (UWB) system. A plurality of RX antennas is coupled to the receiver and a plurality of TX antennas is coupled to the transmitter. An IEEE 802.15.4z standard provides a silent period or gap before and after scrambled timestamp sequences (STS) in a frame. An active antenna is switched to a different antenna in the gaps. This allows the angle measurements to be performed with only a single transmitter and receiver within one channel impulse response (CIR) measurement cycle.
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公开(公告)号：US20240414026A1
公开(公告)日：2024-12-12
申请号：US18208080
申请日：2023-06-09
Applicant: NXP B.V.
Inventor： Shreyas Srirama reddy Manjuladevi , Radha Srinivasan , Tushar Nagrare
IPC: H04L25/02 , H04B1/7163
Abstract: Embodiments of wireless communications systems, ultra-wide band (UWB) systems, and methods for wireless communications are described. In an embodiment, a wireless communications system includes a processor configured to obtain an angle of arrival (AoA) estimate from wireless signals; perform a Channel Impulse Response (CIR) analysis, and determine a confidence level for the AoA estimate based on the CIR analysis.
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公开(公告)号：US11051244B2
公开(公告)日：2021-06-29
申请号：US16428595
申请日：2019-05-31
Applicant: NXP B.V.
Inventor： Jun Zhou , Radha Srinivasan , Brima Babatunde Ibrahim
IPC: H04W52/02 , H04B1/7163 , H04L25/02
Abstract: Embodiments of a method and a device are disclosed. In an embodiment, a method for operating an ultra-wideband (UWB) device is disclosed. The method involves powering down a first receive path of a multipath UWB device while leaving a second receive path of the multipath UWB device powered up, powering down channel estimation, tracking, and demodulation functions of the second receive path, and performing an acquisition function using the second receive path while the first receive path is powered down and while the channel estimation, tracking, and demodulation functions of the second receive path are powered down.
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公开(公告)号：US10735038B2
公开(公告)日：2020-08-04
申请号：US15907544
申请日：2018-02-28
Applicant: NXP B.V.
Inventor： Radha Srinivasan , Ulrich Andreas Muehlmann , Frederic Benoist , Stefan Mendel , Steve Charpentier
IPC: H04B1/12 , H04B17/318 , H04B5/00 , H03M1/06 , H03M1/12
Abstract: Embodiments are provided for a method of operating a receiver system, the receiver system comprising one or more channels, the method comprising: monitoring a residual DC (direct current) offset in a present channel by sampling an output of an analog-to-digital converter (ADC) of the present channel; adjusting a DCO (direct current offset) correction signal that corresponds to the residual DC offset in response to an absolute value of the residual DC offset exceeding a programmable DCO threshold; and subtracting the DCO correction signal from an analog signal provided to the ADC to reduce the residual DC offset below the programmable DCO threshold.
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