公开(公告)号：US09615386B2

公开(公告)日：2017-04-04

申请号：US14591588

申请日：2015-01-07

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Jing Jiang ,  Mingjian Yan ,  Aleksandar Purkovic ,  Constantin Bajenaru

IPC: H04W4/00 ,  H04W74/08 ,  H04W74/00

CPC classification number: H04W74/0833 ,  H04W74/004

Abstract: A wireless device includes a preamble detector configured to identify preambles transmitted via a random access channel of a wireless network. The preamble detector includes preamble false alarm logic. The preamble false alarm logic is configured to set a preamble false alarm detection window, and compare, to one another, preambles identified in the false alarm detection window. The preamble false alarm logic is configured to identify, based on the comparison, a largest of the preambles in the false alarm detection window, and reject all but the identified largest of the preambles as false alarm detections.

公开(公告)号：US20220308196A1

公开(公告)日：2022-09-29

申请号：US17388954

申请日：2021-07-29

Applicant: Texas Instruments Incorporated

Inventor： Sandeep Rao ,  Aleksandar Purkovic

IPC: G01S13/56 ,  G01S13/34 ,  G01S7/41

Abstract: Methods and apparatus are disclosed low power motion detection by a radar apparatus. One example radar apparatus includes a transmitter to transmit a pattern of chirps. The transmitted pattern includes a first series of chirps transmitted during a first time period and a second series of chirps transmitted during a second time period that begins after passage of a sleep time period from an end of the first time period. The example radar apparatus also includes a receiver to detect returning chirps including reflected portions of the transmitted pattern. The example radar apparatus also includes analog to digital converter (ADC) coupled to the receiver. The ADC is to sample analog signals from the receiver to generate ADC samples for the returning chirps detected by the receiver.

公开(公告)号：US09756657B2

公开(公告)日：2017-09-05

申请号：US14335546

申请日：2014-07-18

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Jing Jiang ,  Mingjian Yan ,  Aleksandar Purkovic

IPC: H04W74/00 ,  H04B17/345 ,  H04L27/26 ,  H04J11/00 ,  H04W52/24 ,  H04W52/32 ,  H04W52/50 ,  H04W28/18

CPC classification number: H04W74/008 ,  H04B17/345 ,  H04J11/0036 ,  H04L27/2613 ,  H04L27/2675 ,  H04W28/18 ,  H04W52/241 ,  H04W52/243 ,  H04W52/325 ,  H04W52/50

Abstract: A wireless device includes a preamble detector configured to identify a plurality of preambles transmitted via a random access channel of a wireless network. The preamble detector includes a noise floor estimator. The noise floor estimator is configured to: estimate, for a given preamble root sequence identified by the preamble detector, a noise floor value as mean energy of received signal samples, excluding detected preamble samples on the give preamble root sequence, below a noise floor threshold assigned to the given preamble root sequence. The noise floor estimator is configured to compute the noise floor threshold as a product of: average energy of the received signal samples less total signal energy contained in each cyclic prefix window in which a preamble is detected using the given preamble root sequence; and a predetermined normalized relative noise floor threshold based on a target false preamble detection rate.

公开(公告)号：US20150215968A1

公开(公告)日：2015-07-30

申请号：US14591588

申请日：2015-01-07

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Jing JIANG ,  Mingjian Yan ,  Aleksandar Purkovic ,  Constantin Bajenaru

IPC: H04W74/08 ,  H04W72/08

CPC classification number: H04W74/0833 ,  H04W74/004

Abstract: A wireless device includes a preamble detector configured to identify preambles transmitted via a random access channel of a wireless network. The preamble detector includes preamble false alarm logic. The preamble false alarm logic is configured to set a preamble false alarm detection window, and compare, to one another, preambles identified in the false alarm detection window. The preamble false alarm logic is configured to identify, based on the comparison, a largest of the preambles in the false alarm detection window, and reject all but the identified largest of the preambles as false alarm detections.

Abstract translation: 无线设备包括：前置码检测器，被配置为识别经由无线网络的随机接入信道发送的前同步码。 前导码检测器包括前导码错误警报逻辑。 前导码错误警报逻辑被配置为设置前导码错误警报检测窗口，并且将彼此比较在虚警报检测窗口中识别的前导码。 前导码伪报警逻辑被配置为基于比较来识别假警报检测窗口中的最大的前导码，并且将除了所识别的最大的前导码之外的所有的所有前导码都除外作为虚假警报检测。

公开(公告)号：US20150023329A1

公开(公告)日：2015-01-22

申请号：US14335546

申请日：2014-07-18

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Jing Jiang ,  Mingjian Yan ,  Aleksandar Purkovic

IPC: H04W74/00 ,  H04W72/04 ,  H04W52/24

CPC classification number: H04W74/008 ,  H04B17/345 ,  H04J11/0036 ,  H04L27/2613 ,  H04L27/2675 ,  H04W28/18 ,  H04W52/241 ,  H04W52/243 ,  H04W52/325 ,  H04W52/50

Abstract: A wireless device includes a preamble detector configured to identify a plurality of preambles transmitted via a random access channel of a wireless network. The preamble detector includes a noise floor estimator. The noise floor estimator is configured to: estimate, for a given preamble root sequence identified by the preamble detector, a noise floor value as mean energy of received signal samples, excluding detected preamble samples on the give preamble root sequence, below a noise floor threshold assigned to the given preamble root sequence. The noise floor estimator is configured to compute the noise floor threshold as a product of: average energy of the received signal samples less total signal energy contained in each cyclic prefix window in which a preamble is detected using the given preamble root sequence; and a predetermined normalized relative noise floor threshold based on a target false preamble detection rate.

Abstract translation: 无线设备包括：前导码检测器，被配置为识别经由无线网络的随机接入信道发送的多个前同步码。 前导码检测器包括噪声基底估计器。 噪声基底估计器被配置为：对于由前导码检测器识别的给定前导码根序列，估计作为接收信号样本的平均能量的噪声本底值，不包括在给定前导根序列上的检测到的前导码样本，低于噪声基底阈值 分配给给定的前导根序列。 噪声基底估计器被配置为计算噪声基底阈值作为以下乘积的乘积：接收信号样本的平均能量减去包含在每个循环前缀窗口中的总信号能量，其中使用给定的前导根序列检测前置码; 以及基于目标假前同步码检测率的预定的归一化相对噪声基底阈值。