公开(公告)号：US10145937B2

公开(公告)日：2018-12-04

申请号：US15088566

申请日：2016-04-01

Applicant: Texas Instruments Incorporated

Inventor： Pankaj Gupta ,  Sriram Murali ,  Karthik Ramasubramanian

IPC: G01S7/35 ,  G01S13/34 ,  G01S13/93 ,  G01S13/00

Abstract: A FMCW radar receiver includes a LO providing a chirped LO signal, an in-phase (I) channel for outputting I-data and a quadrature (Q) channel for outputting Q-data. A dynamic correction parameter generator generates IQ phase correction values (P[n]s) and IQ gain correction values (G[n]s) based on a frequency slope rate of the chirped LO signal for generating during intervals of chirps including a first sequence of P[n]s and G[n]s during a first chirp and a second sequence of P[n]s and G[n]s during a second chirp. An IQ mismatch (IQMM) correction circuit has a first IQMM input coupled to receive the I-data and a second IQMM input receiving the Q-data, and the P[n]s and G[n]s. During the first chirp the IQMM correction circuit provides first Q′-data and first I′-data and during the second chirp the IQMM correction circuit provides at least second Q′-data and second I′-data.

公开(公告)号：US09680677B2

公开(公告)日：2017-06-13

申请号：US14528660

申请日：2014-10-30

Applicant: Texas Instruments Incorporated

Inventor： Sriram Murali ,  Indu Prathapan ,  Pankaj Gupta ,  Zahir Ibrahim Parkar ,  Sundarrajan Rangachari

IPC: H04L27/14 ,  H04L27/156 ,  H04L27/34 ,  H04W52/02

CPC classification number: H04L27/1566 ,  H04L27/3455 ,  H04W52/0229 ,  Y02D70/00

Abstract: A weather band receiver, which may be part of an FM receiver, is disclosed. FSK-encoded data units in an alert packet transmission are detected using a quadrature matched filter circuit. At least one FSK-encoded data unit is captured from the alert packet transmission. Soft quantized bits are extracted from the FSK-encoded data units. The soft quantized bits are saved to memory and used to recover an alert message. Soft quantized bits from two or more FSK-encoded data units may be combined before recovering the alert message.

公开(公告)号：US20150249907A1

公开(公告)日：2015-09-03

申请号：US14194449

申请日：2014-02-28

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Pankaj Gupta ,  Sthanunathan Ramakrishnan ,  Jaiganesh Balakrishnan ,  Sachin Bhardwaj

IPC: H04W4/04

CPC classification number: H04W4/043

Abstract: Several systems and methods for location estimation in a multi-floor environment are disclosed. In an embodiment, the method includes performing wireless scanning so as to receive wireless signals from one or more access points from among a plurality of access points positioned at plurality of locations, respectively at one or more floors from among a plurality of floors within the multi-floor environment. A first set of RSSI measurements is computed corresponding to the wireless signals. Absolute floor location information is determined based on the first set of RSSI measurements and a pre-defined objective function. The pre-defined objective function is configured to maximize a probability of a user being located at a floor so as to receive the wireless signals. A user floor location is determined based on the absolute floor location information. The user location is estimated at least in part based on the user floor location.

Abstract translation: 公开了用于多层环境中的位置估计的几种系统和方法。 在一个实施例中，该方法包括执行无线扫描，以便从位于多个接入点内的多个接入点中的多个接入点接收无线信号，所述多个接入点分别位于多个接入点内的多个接入点 - 地板环境。 对应于无线信号计算第一组RSSI测量。 基于第一组RSSI测量和预定义的目标函数来确定绝对楼层位置信息。 预定义的目标函数被配置为最大化用户位于楼层的概率以便接收无线信号。 基于绝对楼层位置信息确定用户楼层位置。 至少部分地基于用户楼层位置来估计用户位置。