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公开(公告)号：US20200007365A1
公开(公告)日：2020-01-02
申请号：US16375783
申请日：2019-04-04
摘要： IQ mismatch correction for analog chain IQ mismatch impairments is based on a two-filter architecture. In either RX or TX, an IQmc mismatch corrector (digital chain) filters I and Q digital signals, and includes an I-path to receive the I signal, and a Q-path to receive the Q signal, and is configured with two filters: an in-path filter to filter either the I signal or the Q signal received in the same path; and a cross-path filter to filter either the I signal or the Q signal received in the other path. The IQmc mismatch corrector can include: an I-path delay element to provide a delay to the I signal corresponding to a delay through either the in-path filter or the cross-path filter; and a Q-path delay element to provide a delay to the Q signal corresponding to a delay through either the in-path filter or the cross-path filter.
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公开(公告)号：US20190013818A1
公开(公告)日：2019-01-10
申请号：US16029539
申请日：2018-07-06
发明人： Sthanunathan Ramakrishnan , Sashidharan Venkatraman , Jaiganesh Balakrishnan , Sreenath Narayanan Potty
CPC分类号： H03M1/121 , H03F1/0244 , H03M1/0626 , H03M1/1215 , H03M1/129 , H03M1/185
摘要： An interleaved ADC receives an RX signal attenuated by a DSA based on an active DSA setting, within a range of DSA settings (DSA setting range) corresponding to selectable attenuation steps, the DSA setting range partitioned into a number of DSA setting subranges (DSA subranges). The ADC includes an IL mismatch estimation engine in the digital signal path, with an estimation subrange blanker, and an IL mismatch estimator. The estimation subrange blanker is coupled to receive the IADC data stream, and responsive to a DSA subrange allocation signal to select, in each of successive aggregation cycles, IADC data corresponding to an active DSA setting that is within an allocated DSA subrange (DSA active data within an DSA allocated subrange). The IL mismatch estimator aggregates, during each aggregation cycle, IL mismatch estimation data based on the selected DSA active data within the DSA allocated subrange, generates an estimate of IL mismatch (IL mismatch estimate) based on the aggregated IL mismatch estimation data, generates IL mismatch correction parameters based on the aggregated IL mismatch estimation data, and generates IL mismatch estimate uncertainty data corresponding to an uncertainty in the IL mismatch estimate used to generate the associated IL mismatch correction parameters for the DSA allocated subrange. A DSA statistics collector to collect a distribution of DSA settings over a pre-defined time period (DSA setting distribution statistics). An estimation subrange allocator coupled to receive DSA setting distribution statistics, and the IL mismatch estimate uncertainty data, and to provide to the estimation subrange blanker the DSA subrange allocation signal according to a pre-defined allocation strategy.
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3.发明授权公开(公告)号：US09955300B2
公开(公告)日：2018-04-24
申请号：US13901777
申请日：2013-05-24
摘要： A method for incorporating invisible APs for RSSI based indoor positioning is presented. An empirical estimate of the probability of invisible APs versus distance is computed. An estimated position of the receiver can be computed using any statistical estimator based on the probability. In one embodiment, an estimate of the probability is computed by combining the probability over a set of visible APs and the probability over a set of invisible APs with the probability of individual contribution. In one embodiment a dynamic procedure is used to update the invisible probability that is computed using an AP dictionary built on the fly as new APs are detected. Incorporating invisible APs for estimating user position from the RSSI measurements for indoor positioning provides a better positioning accuracy as compared to typical estimators which rely only on the visible APs.
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公开(公告)号：US09510319B2
公开(公告)日：2016-11-29
申请号：US14565878
申请日：2014-12-10
发明人： Sthanunathan Ramakrishnan , Sashidharan Venkatraman , Ravi Krishna Bhat , Jaiganesh Balakrishnan , Saket Thukral
IPC分类号： H04W64/00
CPC分类号： H04W64/006 , H04W84/12
摘要： Several methods and systems for location estimation are disclosed. In an embodiment, the method includes performing a primary wireless scan to identify a first set of access points at a user location associated with a first user location estimate. A secondary wireless scan is performed at pre-defined time intervals subsequent to the primary wireless scan. A set of access points is identified corresponding to each secondary wireless scan. The method further comprises detecting a presence or an absence of user motion based on a number of shared access points between the first set of access points and a set of access points corresponding to each secondary wireless scan. A current user location is estimated to be the first user location estimate if the user motion is detected to be absent, or a second user location estimate computed based on geolocation signals if the user motion is detected to be present.
摘要翻译： 公开了几种用于位置估计的方法和系统。 在一个实施例中，该方法包括执行主无线扫描以识别与第一用户位置估计相关联的用户位置处的第一组接入点。 在主要无线扫描之后，以预定义的时间间隔执行辅助无线扫描。 与每个次级无线扫描相对应的一组接入点。 该方法还包括基于第一组接入点与对应于每个辅助无线扫描的一组接入点之间的共享接入点的数量来检测用户运动的存在或不存在。 如果检测到用户运动不存在，估计当前用户位置是第一用户位置估计，或者如果检测到用户运动存在，则基于地理位置信号计算的第二用户位置估计。
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公开(公告)号：US20160174185A1
公开(公告)日：2016-06-16
申请号：US14565878
申请日：2014-12-10
发明人： Sthanunathan Ramakrishnan , Sashidharan Venkatraman , Ravi Krishna Bhat , Jaiganesh Balakrishnan , Saket Thukral
IPC分类号： H04W64/00
CPC分类号： H04W64/006 , H04W84/12
摘要： Several methods and systems for location estimation are disclosed. In an embodiment, the method includes performing a primary wireless scan to identify a first set of access points at a user location associated with a first user location estimate. A secondary wireless scan is performed at pre-defined time intervals subsequent to the primary wireless scan. A set of access points is identified corresponding to each secondary wireless scan. The method further comprises detecting a presence or an absence of user motion based on a number of shared access points between the first set of access points and a set of access points corresponding to each secondary wireless scan. A current user location is estimated to be the first user location estimate if the user motion is detected to be absent, or a second user location estimate computed based on geolocation signals if the user motion is detected to be present.
摘要翻译： 公开了几种用于位置估计的方法和系统。 在一个实施例中，该方法包括执行主无线扫描以识别与第一用户位置估计相关联的用户位置处的第一组接入点。 在主要无线扫描之后，以预定义的时间间隔执行辅助无线扫描。 与每个次级无线扫描相对应的一组接入点。 该方法还包括基于第一组接入点与对应于每个辅助无线扫描的一组接入点之间的共享接入点的数量来检测用户运动的存在或不存在。 如果检测到用户运动不存在，估计当前用户位置是第一用户位置估计，或者如果检测到用户运动存在，则基于地理位置信号计算的第二用户位置估计。
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公开(公告)号：US09160358B2
公开(公告)日：2015-10-13
申请号：US14656025
申请日：2015-03-12
发明人： Sthanunathan Ramakrishnan , Jawaharlal Tangudu , Sashidharan Venkatraman , Karthik Khanna Subramani , Sreenath Narayanan Potty
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。
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公开(公告)号：US11469784B2
公开(公告)日：2022-10-11
申请号：US17001157
申请日：2020-08-24
发明人： Aswath Vs , Sthanunathan Ramakrishnan , Sriram Murali , Sarma Sundareswara Gunturi , Jaiganesh Balakrishnan , Sashidharan Venkatraman
摘要： One example includes a receiver system. The receiver system includes an analog-to-digital converter (ADC) configured to convert an analog input signal into a digital output signal at a sampling frequency. The receiver system also includes a spur correction system configured to receive the digital output signal and to estimate spurs associated with the digital output signal and to selectively correct a subset of the spurs associated with a set of frequencies that are based on the sampling frequency.
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公开(公告)号：US20200313944A1
公开(公告)日：2020-10-01
申请号：US16902529
申请日：2020-06-16
摘要： IQ mismatch correction for analog chain IQ mismatch impairments is based on a two-filter architecture. In either RX or TX, an IQmc mismatch corrector (digital chain) filters I and Q digital signals, and includes an I-path to receive the I signal, and a Q-path to receive the Q signal, and is configured with two filters: an in-path filter to filter either the I signal or the Q signal received in the same path; and a cross-path filter to filter either the I signal or the Q signal received in the other path. The IQmc mismatch corrector can include: an I-path delay element to provide a delay to the I signal corresponding to a delay through either the in-path filter or the cross-path filter; and a Q-path delay element to provide a delay to the Q signal corresponding to a delay through either the in-path filter or the cross-path filter.
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公开(公告)号：US10715376B2
公开(公告)日：2020-07-14
申请号：US16444035
申请日：2019-06-18
摘要： An IQ mismatch correction function generator configured to generate an enhanced IQ mismatch correction function to improve the compensation for IQ mismatch, and an IQ signal receiver with the IQ mismatch correction function generator, wherein the enhanced IQ mismatch correction function is determined based on an initial IQ mismatch correction function derived from IQ mismatch estimates corresponding to frequency bins where signals are present and error of the initial IQ mismatch correction function by comparing the values of the initial IQ mismatch correction function with IQ mismatch estimates corresponding to a respective bin of the frequency bins.
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公开(公告)号：US10541703B2
公开(公告)日：2020-01-21
申请号：US16029539
申请日：2018-07-06
发明人： Sthanunathan Ramakrishnan , Sashidharan Venkatraman , Jaiganesh Balakrishnan , Sreenath Narayanan Potty
摘要： An interleaved ADC receives an RX signal attenuated by a DSA based on an active DSA setting, within a range of DSA settings (DSA setting range) corresponding to selectable attenuation steps, the DSA setting range partitioned into a number of DSA setting subranges (DSA subranges). The ADC includes an IL mismatch estimation engine in the digital signal path, with an estimation subrange blanker, and an IL mismatch estimator. The estimation subrange blanker is coupled to receive the IADC data stream, and responsive to a DSA subrange allocation signal to select, in each of successive aggregation cycles, IADC data corresponding to an active DSA setting that is within an allocated DSA subrange (DSA active data within an DSA allocated subrange). The IL mismatch estimator aggregates, during each aggregation cycle, IL mismatch estimation data based on the selected DSA active data within the DSA allocated subrange, generates an estimate of IL mismatch (IL mismatch estimate) based on the aggregated IL mismatch estimation data, generates IL mismatch correction parameters based on the aggregated IL mismatch estimation data, and generates IL mismatch estimate uncertainty data corresponding to an uncertainty in the IL mismatch estimate used to generate the associated IL mismatch correction parameters for the DSA allocated subrange. A DSA statistics collector to collect a distribution of DSA settings over a pre-defined time period (DSA setting distribution statistics). An estimation subrange allocator coupled to receive DSA setting distribution statistics, and the IL mismatch estimate uncertainty data, and to provide to the estimation subrange blanker the DSA subrange allocation signal according to a pre-defined allocation strategy.
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