公开(公告)号：US09374678B2

公开(公告)日：2016-06-21

申请号：US14194449

申请日：2014-02-28

申请人： TEXAS INSTRUMENTS INCORPORATED

发明人： Pankaj Gupta ,  Sthanunathan Ramakrishnan ,  Jaiganesh Balakrishnan ,  Sachin Bhardwaj

IPC分类号： H04W4/04

CPC分类号： H04W4/043

摘要： 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.

摘要翻译： 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。

公开(公告)号：US09184762B2

公开(公告)日：2015-11-10

申请号：US14656205

申请日：2015-03-12

申请人： TEXAS INSTRUMENTS INCORPORATED

发明人： Sthanunathan Ramakrishnan ,  Sashidharan Venkatraman ,  Sreenath Narayanan Potty ,  Sunil Chomal ,  Nagarajan Viswanathan ,  Jawaharlal Tangudu

IPC分类号： H03M1/10 ,  H03M1/36 ,  H03M1/08 ,  H03M1/06 ,  H03M1/12

CPC分类号： H03M1/368 ,  H03M1/06 ,  H03M1/0836 ,  H03M1/1038 ,  H03M1/1085 ,  H03M1/121 ,  H03M1/1215

摘要： A system can include a signal image correlator receives a discrete frequency domain representation of a signal tone in an interleaved analog-to-digital (IADC) signal and an image of the signal tone in the discrete frequency domain representation of the IADC signal and determines a correlation between the signal tone and the image of the signal tone, a power of the signal tone and a power of the image of the signal tone. The system can also include a frequency domain estimator that determines an instantaneous frequency domain mismatch profile estimate based on the correlation between the signal tone and the image of the signal tone. The system can further include an averaging filter that averages the instantaneous frequency domain mismatch profile estimate over time to provide a frequency domain mismatch profile estimate.

摘要翻译： 系统可以包括信号图像相关器接收交织的模数（IADC）信号中的信号音的离散频域表示和IADC信号的离散频域表示中的信号音的图像，并且确定 信号音和信号音的图像之间的相关性，信号音的功率和信号音的图像的功率。 该系统还可以包括频域估计器，其基于信号音和信号音的图像之间的相关性来确定瞬时频域失配曲线估计。 该系统还可以包括平均滤波器，其对瞬时频域失配曲线估计进行平均以提供频域不匹配曲线估计。

公开(公告)号：US20150263747A1

公开(公告)日：2015-09-17

申请号：US14656025

申请日：2015-03-12

申请人： TEXAS INSTRUMENTS INCORPORATED

发明人： Sthanunathan Ramakrishnan ,  Jawaharlal Tangudu ,  Sashidharan Venkatraman ,  Karthik Khanna Subramani ,  Sreenath Narayanan Potty

IPC分类号： H03M1/10 ,  H03M1/12

CPC分类号： H03M1/1085 ,  H03M1/1038 ,  H03M1/1215

摘要： A system can include a close-in tone control configured to detect a set of close-in tones of an interleaved analog to digital converter (IADC) signal and output a trigger signal in response to the detection. The system can also include a close-in tone mismatch estimator configured to determine a correlation and a power estimate for the set of close-in tones in the IADC signal in response to the trigger signal.

摘要翻译： 系统可以包括配置成检测交错模数转换器（IADC）信号的一组接近音调的接近音调控制，并且响应于该检测而输出触发信号。 该系统还可以包括接近音调失配估计器，其被配置为响应于触发信号来确定IADC信号中的接近音调集合的相关性和功率估计。

公开(公告)号：US08774933B2

公开(公告)日：2014-07-08

申请号：US14019113

申请日：2013-09-05

申请人： Texas Instruments Incorporated

发明人： Sthanunathan Ramakrishnan ,  Jaiganesh Balakrishnan

IPC分类号： A61N1/18

CPC分类号： A61N1/37252 ,  A61N1/08 ,  A61N1/37211

摘要： By a medical implant transceiver implantable within a body of a living organism, a portion of a signal is received from a medical controller transceiver external to the body of the living organism. Based on directions within the portion of the signal, a time duration is determined, after which a subsequent portion of the signal is to be transmitted from the medical controller transceiver. The directions include a value indicative of the time duration. The time duration differs based on the value. The subsequent portion is to be transmitted from the medical controller transceiver after an end of the portion. The medical implant transceiver enters into an inactive state for the time duration and awakens after the time duration has elapsed.

摘要翻译： 通过可植入在活体内的医疗植入物收发器，信号的一部分从生物体的身体外部的医疗控制收发器接收。 基于信号部分内的方向，确定持续时间，之后从医疗控制收发器发送信号的后续部分。 方向包括指示持续时间的值。 持续时间根据值而不同。 在部分结束之后，将从医疗控制器收发器发送随后的部分。 医疗植入物收发器在持续时间内进入非活动状态，并在持续时间过去后唤醒。