Patents by Inventor Sridhar Gollamudi
Sridhar Gollamudi 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: 8675772Abstract: This invention relates to a closed loop duplex communications system having at least two antennae at the forward link transmitter. A feedback channel from the forward link receiver to the forward link transmitter carries feedback information about the phase and magnitude relationships of the forward link channels from different transmitter antennae. The feedback information is used to compute beamforming weights for the forward link. The signals received on the at least two antennae of the reverse link are used to compute code correlation parameters for application on the forward link.Type: GrantFiled: May 9, 2001Date of Patent: March 18, 2014Assignee: Alcatel LucentInventor: Sridhar Gollamudi
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Patent number: 8599979Abstract: Example embodiments include methods of interference cancellation at NodeB receivers of baseband antenna signals including physical channels. The methods include canceling interference from a received baseband antenna signal by removing a reconstructed baseband signal from the processed received baseband antenna signal. The processed reconstructed baseband signal includes users whose physical data channel signals were successfully decoded. Methods also include removing interference from a received baseband signal to form an interference cancelled baseband signal that will be processed by the receiver. The interference cancelled baseband signal is the received baseband antenna signal minus users' signal interference contributions whose demodulated physical data channel signals have a determined user symbol energy value that exceeds a threshold. Methods further include removing interference from a user's signal to be error corrected.Type: GrantFiled: April 23, 2012Date of Patent: December 3, 2013Assignee: Alcatel LucentInventors: Emad Farag, Sridhar Gollamudi, Robert Soni
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Patent number: 8442168Abstract: Example embodiments include methods of interference cancellation at NodeB receivers of baseband antenna signals including physical channels. The methods include canceling interference from a received baseband antenna signal by removing a reconstructed baseband signal from the processed received baseband antenna signal. The processed reconstructed baseband signal includes users whose physical data channel signals were successfully decoded. Methods also include removing interference from a received baseband signal to form an interference cancelled baseband signal that will be processed by the receiver. The interference cancelled baseband signal is the received baseband antenna signal minus users' signal interference contributions whose demodulated physical data channel signals have a determined user symbol energy value that exceeds a threshold. Methods further include removing interference from a user's signal to be error corrected.Type: GrantFiled: April 23, 2012Date of Patent: May 14, 2013Assignee: Alcatel LucentInventors: Emad Farag, Sridhar Gollamudi, Robert Soni
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Patent number: 8306164Abstract: Example embodiments include methods of interference cancellation at NodeB receivers of baseband antenna signals including physical channels. The methods include canceling interference from a received baseband antenna signal by removing a reconstructed baseband signal from the processed received baseband antenna signal. The processed reconstructed baseband signal includes users whose physical data channel signals were successfully decoded. Methods also include removing interference from a received baseband signal to form an interference cancelled baseband signal that will be processed by the receiver. The interference cancelled baseband signal is the received baseband antenna signal minus users' signal interference contributions whose demodulated physical data channel signals have a determined user symbol energy value that exceeds a threshold. Methods further include removing interference from a user's signal to be error corrected.Type: GrantFiled: February 11, 2009Date of Patent: November 6, 2012Assignee: Alcatel LucentInventors: Emad Farag, Sridhar Gollamudi, Robert Soni
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Publication number: 20120207256Abstract: Example embodiments include methods of interference cancellation at NodeB receivers of baseband antenna signals including physical channels. The methods include canceling interference from a received baseband antenna signal by removing a reconstructed baseband signal from the processed received baseband antenna signal. The processed reconstructed baseband signal includes users whose physical data channel signals were successfully decoded. Methods also include removing interference from a received baseband signal to form an interference cancelled baseband signal that will be processed by the receiver. The interference cancelled baseband signal is the received baseband antenna signal minus users' signal interference contributions whose demodulated physical data channel signals have a determined user symbol energy value that exceeds a threshold. Methods further include removing interference from a user's signal to be error corrected.Type: ApplicationFiled: April 23, 2012Publication date: August 16, 2012Inventors: Emad Farag, Sridhar Gollamudi, Robert Soni
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Publication number: 20120207249Abstract: Example embodiments include methods of interference cancellation at NodeB receivers of baseband antenna signals including physical channels. The methods include canceling interference from a received baseband antenna signal by removing a reconstructed baseband signal from the processed received baseband antenna signal. The processed reconstructed baseband signal includes users whose physical data channel signals were successfully decoded. Methods also include removing interference from a received baseband signal to form an interference cancelled baseband signal that will be processed by the receiver. The interference cancelled baseband signal is the received baseband antenna signal minus users' signal interference contributions whose demodulated physical data channel signals have a determined user symbol energy value that exceeds a threshold. Methods further include removing interference from a user's signal to be error corrected.Type: ApplicationFiled: April 23, 2012Publication date: August 16, 2012Inventors: Emad Farag, Sridhar Gollamudi, Robert Soni
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Patent number: 8150404Abstract: Methods for allocating wireless resources are provided. In one method, time domain resources are persistently allocated to a user for a data transmission during a transmission time interval, and frequency domain resources are dynamically allocated to the user for the data transmission during the transmission time interval. Methods provide flexibility for overbooking resources for any TTI to obtain statistical multiplexing gains.Type: GrantFiled: March 14, 2008Date of Patent: April 3, 2012Assignee: Alcatel LucentInventor: Sridhar Gollamudi
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Patent number: 7894402Abstract: Spatial Division Multiple Access (SDMA) may be implemented in both the forward and reverse link directions through the use of, for example, a sector-wide primary pilot channel and one or more beamformed secondary pilot channels (secondary pilot channel).Type: GrantFiled: April 15, 2005Date of Patent: February 22, 2011Assignee: Alcatel-Lucent USA Inc.Inventors: Sridhar Gollamudi, Pantelis Monogioudis, Robert Atmaram Soni, Harish Viswanathan
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Patent number: 7801087Abstract: A method is provided by which an information-bearing message may be inferred by the receiver on the basis of which one of the M communication channels was used for transmission.Type: GrantFiled: April 27, 2006Date of Patent: September 21, 2010Assignee: Alcatel-Lucent USA Inc.Inventor: Sridhar Gollamudi
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Patent number: 7801071Abstract: Embodiments of the present invention relate to communication systems. Such communication systems may include a beamformer that is adapted to provide a plurality of beams, each of the plurality of beams providing communication for a corresponding coverage envelope, the plurality of coverage envelopes comprising at least one pair of overlapping coverage envelopes and at least one pair of non-overlapping coverage envelopes, and a scheduler that assigns system resources from a group of shared system resources to a plurality of receivers distributed throughout the coverage envelopes, the scheduler being adapted to assign the same system resources from the group of shared system resources for use during a simultaneous data transmission to a receiver in each of the coverage envelopes that comprises the at least one pair of non-overlapping coverage envelopes.Type: GrantFiled: October 30, 2003Date of Patent: September 21, 2010Assignee: Alcatel-Lucent USA Inc.Inventors: Sridhar Gollamudi, Harish Viswanathan
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Patent number: 7787530Abstract: An adaptive quality control loop for link rate adaptation based on modulation and/or coding schemes (also referred to as “MCS levels”) and one or more spreading codes that adaptively selects channel condition thresholds in real-time without measuring all the factors that affect selecting optimal channel condition thresholds. The adaptive quality control loop involves adjusting the channel condition thresholds with variable up and down steps based on target quality metrics along with measurements such as error detection results, relative frequencies of visiting each MCS level, and transmitted data rates, wherein the target quality metrics can be a block error rate or bit error rate target criterion. If the target quality metric is a block error rate target criterion, the variable step is determined using a desired MCS error rate based on MCS probabilities, MCS error rates and the block error rate target criterion.Type: GrantFiled: December 28, 2001Date of Patent: August 31, 2010Assignee: Alcatel-Lucent USA Inc.Inventors: Sridhar Gollamudi, Pantelis Monogioudis
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Publication number: 20100202575Abstract: Example embodiments include methods of interference cancellation at NodeB receivers of baseband antenna signals including physical channels. The methods include canceling interference from a received baseband antenna signal by removing a reconstructed baseband signal from the processed received baseband antenna signal. The processed reconstructed baseband signal includes users whose physical data channel signals were successfully decoded. Methods also include removing interference from a received baseband signal to form an interference cancelled baseband signal that will be processed by the receiver. The interference cancelled baseband signal is the received baseband antenna signal minus users' signal interference contributions whose demodulated physical data channel signals have a determined user symbol energy value that exceeds a threshold. Methods further include removing interference from a user's signal to be error corrected.Type: ApplicationFiled: February 11, 2009Publication date: August 12, 2010Inventors: Emad Farag, Sridhar Gollamudi, Robert Soni
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Patent number: 7693099Abstract: In a method of wireless communication, signaling information in a received signal may be detected using a detection parameter. The detection parameter may be determined based on at least one of a probability of false alarm and a target probability of false alarm. Another method may detect signaling information using an estimated transmission probability value for a subsequent time instant that is determined based on an estimated transmission probability value for a current time instant. The detection parameter may also be determined from the estimated probability of transmission values.Type: GrantFiled: May 26, 2004Date of Patent: April 6, 2010Assignee: Alcatel-Lucent USA Inc.Inventors: Sridhar Gollamudi, Shirish Nagaraj
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Patent number: 7499499Abstract: There is disclosed a duplex communication system having multiple antennae at the forward link transmitter. One method of transmitting a stream of information symbols from the antennae is by beamforming. With beamforming the transmitter typically operates in closed loop and uses channel information from the receiver to change beams in the forward link. Another approach employs orthogonal coding. Orthogonal coding can be simpler to implement because it can operate in an open loop system that is without channel knowledge at the transmitter. Each has its advantages and disadvantages. What is here disclosed is a method which is an alternative to using only beamforming or orthogonal coding. The signals transmitted from at least two antennae are by beamforming or orthogonal coding; or by beamforming in combination with orthogonal coding in a proportion that is determined by a reference value which is related to the differences between the signals from the antennae.Type: GrantFiled: June 4, 2001Date of Patent: March 3, 2009Assignee: Alcatel-Lucent USA Inc.Inventor: Sridhar Gollamudi
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Publication number: 20090047984Abstract: One of a plurality of carrier frequencies may be selected as a serving carrier for an uplink transmission based on at least one of a mobile velocity and loading conditions of the plurality of carrier frequencies. Selection of the serving carrier favors a carrier frequency having a smaller loading than at least one other carrier frequency based on the loading conditions. Also, selection of the serving carrier favors a lower frequency carrier for a higher mobile velocity and favors a higher frequency carrier for a lower mobile velocity based on the mobile velocity.Type: ApplicationFiled: June 27, 2008Publication date: February 19, 2009Inventors: Sridhar Gollamudi, Robert Atmaram Soni
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Publication number: 20080298336Abstract: The present invention provides a method multicasting that provides macro-diversity. Embodiments of the method may include receiving, at a mobile unit, a plurality of encoded signals indicative of at least one packet over a corresponding plurality of substantially orthogonal frequency channels associated with a plurality of transmitters. The method may also include demodulating the information indicative of the packet(s) using the plurality of encoded signals and storing the demodulated information.Type: ApplicationFiled: May 31, 2007Publication date: December 4, 2008Inventor: SRIDHAR GOLLAMUDI
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Publication number: 20080240034Abstract: Methods for allocating wireless resources are provided. In one method, time domain resources are persistently allocated to a user for a data transmission during a transmission time interval, and frequency domain resources are dynamically allocated to the user for the data transmission during the transmission time interval. Methods provide flexibility for overbooking resources for any TTI to obtain statistical multiplexing gains.Type: ApplicationFiled: March 14, 2008Publication date: October 2, 2008Inventor: Sridhar Gollamudi
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Publication number: 20070253373Abstract: In an improved method for using an HSDPA control channel HS-SCCH, all k+m bits carried on the HS-SCCH are encoded together to form a single codeword, which is transmitted over the entire duration, i.e., three slots, or 2 ms, of the transmission time interval TTI. At the receiving end, the user will receive, within the first slot, only a partial codeword. The user will make an inference whether it is the intended recipient of the corresponding transmission on the downlink shared channel. If the user determines that it is, indeed, the intended recipient, it buffers the HS-PDSCH signal and receives the remaining part of the HS-SCCH transmission.Type: ApplicationFiled: April 27, 2006Publication date: November 1, 2007Inventor: Sridhar Gollamudi
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Publication number: 20070253374Abstract: A method is provided by which an information-bearing message may be inferred by the receiver on the basis of which one of the M communication channels was used for transmission.Type: ApplicationFiled: April 27, 2006Publication date: November 1, 2007Inventor: Sridhar Gollamudi
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Patent number: 7161956Abstract: An adaptive quality control loop for link rate adaptation that adaptively selects optimal channel condition thresholds in real-time without measuring all the factors that affect selecting channel condition thresholds. The adaptive quality control loop involves adjusting the channel condition thresholds with variable up and down steps based on target quality metrics along with measurements such as error detection results, relative frequencies of visiting each modulation and/or coding schemes (also referred to as “MCS levels”) and transmitted data rates. In one embodiment, the adaptive quality control loop comprises the step of adjusting a channel condition threshold based on a error detection result for a data packet transmission using a variable step. The channel condition threshold is associated with an MCS level used in the data packet transmission.Type: GrantFiled: December 28, 2001Date of Patent: January 9, 2007Assignee: Lucent Technologies Inc.Inventors: Sridhar Gollamudi, Pantelis Monogioudis