Patents by Inventor Sheetal Kalyani
Sheetal Kalyani has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11558337Abstract: A method can include obtaining a limit value. The limit value can correspond to a number of times an email account having a set of email messages is accessed. The method can further include identifying a first email message of the set of email messages. The first email message can have an unread status. The method can further include obtaining, for the first email message, a count of one or more sessions. The first email message can have the unread status both during the one or more sessions and after the one or more sessions. The method can further include comparing the limit value to the count. The method can further include determining, based on the comparing, that a threshold is met. The method can further include modifying the first email message in response to the determining that the threshold is met.Type: GrantFiled: December 9, 2021Date of Patent: January 17, 2023Assignee: International Business Machines CorporationInventors: Sheetal Kalyani Asuri, Pallavi Koganti, Venu Muriki, Supraja Kakarlapudi
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Patent number: 9661643Abstract: Cognitive interference management in Cellular wireless network with relays and micro/pico/femto cells operated in distributed scheduling mode. A cellular system may use RS to improve capacity or for coverage extension. ARS relays the signals between BS 104 and MS by using wireless links between BS-RS and RS-MS during both downlink and uplink transmissions. Embodiments herein disclose a mechanism to explicitly indicate to the MS whether the MAC management messages sent by the BS to the MS are to inform it to perform scanning for interference measurement. Also, disclosed herein is a mechanism to explicitly indicate to the BS whether the message sent by the MS is related to interference measurement.Type: GrantFiled: March 18, 2015Date of Patent: May 23, 2017Assignee: CENTRE OF EXCELLENCE IN WIRELESS TECHNOLOGYInventors: Sheetal Kalyani, Sunil Kaimalettu, Rajet Krishnan, Nadeem Akhtar, Jeniston Deviraj Klutto Milleth, Kiran Kumar Kuchi, Bhaskar Ramamurthi
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Patent number: 9641237Abstract: The embodiments herein disclose an indoor personal relay which has a wireless interface with the BS, which is effective in both cost and technology terms. The indoor personal relay, as disclosed herein is an estimate and forward relay. The relay 101 as disclosed herein does not perform any additional channel decoding/encoding on the data that it receives from the UE or BS. Embodiments disclosed herein enable the relevant UEs to have a high SINR link with the relay. This, in turn, translates to a better effective link quality between the UE and BS and higher indoor rates, which otherwise may have been not as good as a consequence of poor direct link between the UE and the BS. This relay is effectively transparent to the UE. The deployment of relays also implies minimal impact on UE IOT.Type: GrantFiled: April 30, 2015Date of Patent: May 2, 2017Assignee: Centre of Excellence in Wireless TechnologyInventors: Nadeem Akhtar, Rajet Krishnan, Sheetal Kalyani, Sunil Kaimalettu, Bhaskar Ramamurthi
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Patent number: 9564987Abstract: The embodiments described herein provide a method and system for improve link adoption performance in wireless networks. The method for modifying the MCS index for transmission using a computed offset is provided. The offset is calculated based on HARQ feedback of transmissions. A transition probability matrix with plurality of MCS indices is used for selecting the MCS index for transmission based on the highest probability of transition. A pattern sequence of MCS indices is formed and the presence of the pattern is determined in the history of the HARQ transmissions. The frequency of the pattern presence is also determined and the MCS index is selected for the HARQ transmissions. A frequency database of MCS indices is built using source encoding techniques. The transition probabilities that are estimated from the frequency database along with a cost function associated with each MCS index will be used to compute next MCS index.Type: GrantFiled: February 9, 2015Date of Patent: February 7, 2017Assignee: CENTRE OF EXCELLENCE IN WIRELESS TECHNOLOGYInventors: Sheetal Kalyani, Narendran Krishnan, Saishankar Katri Pulliyakode
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Patent number: 9231836Abstract: A system and method for estimating a channel in wireless communication systems using Orthogonal Frequency Division Multiplexing (OFDM). From the received OFDM symbols, Maximum Likelihood (ML) estimate of the channel frequency response is obtained at the pilot locations. A hypothesis test is performed on the ML estimates and the outcome of the hypothesis test is used to decide a shrinkage target. Biased estimation methods are used to shrink the ML estimates towards the shrinkage target to obtain better estimates of the channel frequency response at the pilot locations and these estimates are interpolated using a Filter to get a set of complete estimates of the channel over the resource block. The Filter is an Empirical Weiner Filter or a robust 2D-MMSE filter and the biased estimation is done using either a James-Stein (JS) estimator or a shrinkage estimator or an empirical Bayes estimator.Type: GrantFiled: June 11, 2010Date of Patent: January 5, 2016Assignee: Centre of Excellence in Wireless TechnologyInventors: Sheetal Kalyani, Lakshminarayanan Raghavendran, Krishnamurthi Giridhar
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Publication number: 20150236777Abstract: The embodiments herein disclose an indoor personal relay which has a wireless interface with the BS, which is effective in both cost and technology terms. The indoor personal relay, as disclosed herein is an estimate and forward relay. The relay 101 as disclosed herein does not perform any additional channel decoding/encoding on the data that it receives from the UE or BS. Embodiments disclosed herein enable the relevant UEs to have a high SINR link with the relay. This, in turn, translates to a better effective link quality between the UE and BS and higher indoor rates, which otherwise may have been not as good as a consequence of poor direct link between the UE and the BS. This relay is effectively transparent to the UE. The deployment of relays also implies minimal impact on UE IOT.Type: ApplicationFiled: April 30, 2015Publication date: August 20, 2015Applicant: Centre of Excellence in Wireless TechnologyInventors: Nadeem Akhtar, Rajet Krishnan, Sheetal Kalyani, Sunil Kaimalettu, Bhaskar Ramamurthi
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Publication number: 20150229435Abstract: The embodiments described herein provide a method and system for improve link adaption performance in wireless networks. The method for modifying the MCS index for transmission using a computed offset is provided. The offset is calculated based on HARQ feedback of transmissions. A transition probability matrix with plurality of MCS indices is used for selecting the MCS index for transmission based on the highest probability of transition. A pattern sequence of MCS indices is formed and the presence of the pattern is determined in the history of the HARQ transmissions. The frequency of the pattern presence is also determined and the MCS index is selected for the HARQ transmissions. A frequency database of MCS indices is built using source encoding techniques. The transition probabilities that are estimated from the frequency database along with a cost function associated with each MCS index will be used to compute next MCS index.Type: ApplicationFiled: February 9, 2015Publication date: August 13, 2015Inventors: Sheetal Kalyani, Narendran Kishnan, Saishankar Katri Pulliyakode
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Publication number: 20150195843Abstract: Cognitive interference management in Cellular wireless network with relays and micro/pico/femto cells operated in distributed scheduling mode. A cellular system may use RS to improve capacity or for coverage extension. ARS relays the signals between BS 104 and MS by using wireless links between BS-RS and RS-MS during both downlink and uplink transmissions. Embodiments herein disclose a mechanism to explicitly indicate to the MS whether the MAC management messages sent by the BS to the MS are to inform it to perform scanning for interference measurement. Also, disclosed herein is a mechanism to explicitly indicate to the BS whether the message sent by the MS is related to interference measurement.Type: ApplicationFiled: March 18, 2015Publication date: July 9, 2015Applicant: CENTRE OF EXCELLENCE IN WIRELESS TECHNOLOGYInventors: Sheetal Kalyani, Sunil Kaimalettu, Rajet Krishnan, Nadeem Akhtar, Jeniston Deviraj Klutto Milleth, Kiran Kumar Kuchi, Bhaskar Ramamurthi
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Patent number: 9049678Abstract: The embodiments herein disclose an indoor personal relay which has a wireless interface with the BS, which is effective in both cost and technology terms. The indoor personal relay, as disclosed herein is an estimate and forward relay. The relay 101 as disclosed herein does not perform any additional channel decoding/encoding on the data that it receives from the UE or BS. Embodiments disclosed herein enable the relevant UEs to have a high SINR link with the relay. This, in turn, translates to a better effective link quality between the UE and BS and higher indoor rates, which otherwise may have been not as good as a consequence of poor direct link between the UE and the BS. This relay is effectively transparent to the UE. The deployment of relays also implies minimal impact on UE IOT.Type: GrantFiled: May 25, 2011Date of Patent: June 2, 2015Assignee: Centre of Excellence in Wireless TechnologyInventors: Nadeem Akhtar, Rajet Krishnan, Sheetal Kalyani, Sunil Kaimalettu, Bhaskar Ramamurthi
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Patent number: 9036722Abstract: Present robust 2 Dimensional Minimum Mean Square Error (2D-MMSE) or minimax approach assumes significant time and frequency selectivity due to which it has a poor Mean Square Error (MSE) performance for Resource Blocks (RBs) with low/moderate frequency and/or time selectivity. A filter cannot be designed assuming low frequency and/or time selectivity and use that for all channel models. The instant invention proposes a Robust Adaptive (RA) MMSE filter that can bridge the gap between a robust 2D-MMSE/minimax and the optimal MMSE approach. The RA-MMSE filter smoothens the filter coefficients of the robust 2D-MMSE filter with the degree of smoothing adaptively changing with amount of frequency and time selectivity within a RB. The method uses multiple hypothesis tests on the maximum likelihood Channel Frequency Response (CFR) estimates at the pilots.Type: GrantFiled: October 7, 2011Date of Patent: May 19, 2015Assignee: Centre of Excellence in Wireless TechnologyInventors: Sheetal Kalyani, Raghavendran Lakshminarayanan
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Patent number: 9014636Abstract: Cognitive interference management in Cellular wireless network with relays and micro/pico/femto cells operated in distributed scheduling mode. A cellular system may use RS to improve capacity or for coverage extension. A RS relays the signals between BS 104 and MS by using wireless links between BS-RS and RS-MS during both downlink and uplink transmissions. Embodiments herein disclose a mechanism to explicitly indicate to the MS whether the MAC management messages sent by the BS to the MS are to inform it to perform scanning for interference measurement. Also, disclosed herein is a mechanism to explicitly indicate to the BS whether the message sent by the MS is related to interference measurement.Type: GrantFiled: March 19, 2010Date of Patent: April 21, 2015Assignee: Centre of Excellence In Wireless TechnologyInventors: Sheetal Kalyani, Sunil Kaimalettu, Rajet Krishnan, Nadeem Akhtar, Jeniston Deviraj Klutto Milleth, Kiran Kumar Kuchi, Bhaskar Ramamurthi
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Patent number: 8761308Abstract: Embodiments herein provide using extreme value theory (EVT) as a diagnostic to decide which taps are significant. In the low SINR scenario, embodiments herein also provide the following options; i) Fix the model order to a finite value smaller than the model order assumed for the initial CIR estimate. In the case of OFDM based systems, the model order of the CIR is fixed to a value much smaller that the cyclic prefix length. ii) Use the EVT based method to detect significant tap locations and only keep those tap locations such that the CIR length is again restricted to a value smaller than the model order of the initial channel estimate.Type: GrantFiled: December 29, 2009Date of Patent: June 24, 2014Assignee: Centre of Excellence In Wireless TechnologyInventors: Sheetal Kalyani, Ganesh Venkatraman
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Publication number: 20130225166Abstract: The embodiments herein disclose an indoor personal relay which has a wireless interface with the BS, which is effective in both cost and technology terms. The indoor personal relay, as disclosed herein is an estimate and forward relay. The relay 101 as disclosed herein does not perform any additional channel decoding/encoding on the data that it receives from the UE or BS. Embodiments disclosed herein enable the relevant UEs to have a high SINR link with the relay. This, in turn, translates to a better effective link quality between the UE and BS and higher indoor rates, which otherwise may have been not as good as a consequence of poor direct link between the UE and the BS. This relay is effectively transparent to the UE. The deployment of relays also implies minimal impact on UE IOT.Type: ApplicationFiled: May 25, 2011Publication date: August 29, 2013Inventors: Nadeem Akhtar, Rajet Krishnan, Sheetal Kalyani, Sunil Kaimalettu, Bhaskar Ramamurthi
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Publication number: 20130215826Abstract: A system and method for estimating a channel in wireless communication systems using Orthogonal Frequency Division Multiplexing (OFDM). From the received OFDM symbols, Maximum Likelihood (ML) estimate of the channel frequency response is obtained at the pilot locations. A hypothesis test is performed on the ML estimates and the outcome of the hypothesis test is used to decide a shrinkage target. Biased estimation methods are used to shrink the ML estimates towards the shrinkage target to obtain better estimates of the channel frequency response at the pilot locations and these estimates are interpolated using a Filter to get a set of complete estimates of the channel over the resource block. The Filter is an Empirical Weiner Filter or a robust 2D-MMSE filter and the biased estimation is done using either a James-Stein (JS) estimator or a shrinkage estimator or an empirical Bayes estimator.Type: ApplicationFiled: June 11, 2010Publication date: August 22, 2013Inventors: Sheetal Kalyani, Lakshminarayanan Raghavendran, Krishnamurthi Giridhar
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Publication number: 20130188757Abstract: Present robust 2D-MMSE or minimax approach assumes significant time and frequency selectivity due to which it has a poor MSE performance for RBs with low/moderate frequency and/or time selectivity. Further, a filter cannot be designed assuming low frequency and/or time selectivity and use that for all channel models. The instant invention proposes Robust Adaptive (RA) MMSE filter that can bridge the gap between a robust 2D-MMSE/minimax and the optimal MMSE approach. Further, the RA-MMSE filter smoothens the filter coefficients of the robust 2D-MMSE filter with the degree of smoothing adaptively changing with amount of frequency and time selectivity within a RB. Further, the method uses multiple hypothesis tests on the maximum likelihood CFR estimates at the pilots. Further the RA-MMSE filter solves the minimax estimation problem with additional constraints on the autocorrelation sequence corresponding to the channel frequency response.Type: ApplicationFiled: October 7, 2011Publication date: July 25, 2013Applicant: CENTRE OF EXCELLENCE IN WIRELESS TECHNOLOGYInventors: Sheetal Kalyani, Raghavendran Lakshminarayanan
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Publication number: 20120307939Abstract: Embodiments herein provide using extreme value theory (EVT) as a diagnostic to decide which taps are significant. In the low SINR scenario, embodiments herein also provide the following options; i) Fix the model order to a finite value smaller than the model order assumed for the initial CIR estimate. In the case of OFDM based systems, the model order of the CIR is fixed to a value much smaller that the cyclic prefix length. ii) Use the EVT based method to detect significant tap locations and only keep those tap locations such that the CIR length is again restricted to a value smaller than the model order of the initial channel estimate.Type: ApplicationFiled: December 29, 2009Publication date: December 6, 2012Applicant: CENTRE OF EXCELLENCE IN WIRELESS TECHNOLOGYInventors: Sheetal Kalyani, Ganesh Venkatraman
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Publication number: 20120015659Abstract: Cognitive interference management in Cellular wireless network with relays and micro/pico/femto cells operated in distributed scheduling mode. A cellular system may use RS to improve capacity or for coverage extension. A RS relays the signals between BS 104 and MS by using wireless links between BS-RS and RS-MS during both downlink and uplink transmissions. Embodiments herein disclose a mechanism to explicitly indicate to the MS whether the MAC management messages sent by the BS to the MS are to inform it to perform scanning for interference measurement. Also, disclosed herein is a mechanism to explicitly indicate to the BS whether the message sent by the MS is related to interference measurement.Type: ApplicationFiled: March 19, 2010Publication date: January 19, 2012Applicant: Centre of Excellence in Wireless TechnologyInventors: Sheetal Kalyani, Sunil Kaimalettu, Rajet Krishnan, Nadeem Akhtar, Jeniston Deviraj Klutto Milleth, Kiran Kumar Kuchi, Bhaskar Ramamurthi