公开(公告)号：US20220128678A1

公开(公告)日：2022-04-28

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 ,  G01S13/02 ,  G01S7/02 ,  G01S7/03

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.

公开(公告)号：US10826727B1

公开(公告)日：2020-11-03

申请号：US16581635

申请日：2019-09-24

Applicant: NXP B.V.

Inventor： Jun Zhou ,  Radha Srinivasan ,  Brima Babatunde Ibrahim

IPC: H04L7/04 ,  H04L25/02 ,  H04W24/10

Abstract: Embodiments of a method and a device are disclosed. In an embodiment, a method for operating an impulse radio ultra-wideband (IR-UWB) device is disclosed. The method involves acquiring a signal, integrating one or more synchronization symbols in a synchronization field of the signal to determine an initial channel impulse response (CIR) measurement, and detecting whether a start-of-frame delimiter (SFD) field of the signal is identified during integration. When the SFD field of the signal is identified, the method further involves ceasing integration of the one or more synchronization symbols, scaling the initial CIR measurement, and determining a final CIR measurement based on the scaled CIR measurement. When the SFD field is not identified, the method further involves incrementing a counter configured to count the number of the one or more synchronization symbols integrated, and continuing integration of the one or more synchronization symbols until the SFD field is identified.

公开(公告)号：US10819302B1

公开(公告)日：2020-10-27

申请号：US16530554

申请日：2019-08-15

Applicant: NXP B.V.

Inventor： Radha Srinivasan ,  Brima Babatunde Ibrahim ,  Edward Youssoufian

IPC: H04K3/00 ,  H03G3/30 ,  H03F3/30

Abstract: A communication system including an analog front end and an automatic gain controller. The analog front end includes at least one amplifier for amplifying a received analog signal and an analog to digital converter that converts the analog signal to digital samples. The automatic gain controller includes comparator circuitry, counter circuitry, and a gain controller. The comparator circuitry compares each of the digital samples with an upper threshold and a lower threshold. The counter circuitry counts a high count number of the digital samples having magnitudes that are greater than the upper threshold during each count window and counts a low count number of the digital samples having magnitudes that are less than the lower threshold during the count window. The gain controller adjusts a gain of the at least one amplifier by an amount based on the high count number and the low count number.

公开(公告)号：US10412626B2

公开(公告)日：2019-09-10

申请号：US15706426

申请日：2017-09-15

Applicant: NXP B.V.

Inventor： Ulrich Muehlmann ,  Stefan Mendel ,  Radha Srinivasan

IPC: H04L12/26 ,  H04W28/04 ,  H04L5/00 ,  H04W28/02 ,  H04W28/06 ,  H04L29/06 ,  H04W4/80 ,  H04B5/00 ,  H04B7/08 ,  H04W48/08 ,  H04W72/04

Abstract: Various embodiments relate to a method and circuit for combining channels, the method including receiving, by a matching and smoothing filter, a signal from an analog to digital converter and extracting a root mean square signal level, receiving, by a noise power detector (“NPD”), the signal from the ADC and assessing noise contribution on the signal and receiving, by a maximum ratio combiner, the signal from the matching and smoothing filter wherein a combiner selects between using a geometric sum and an arithmetic sum to combine the channels.