Patents by Inventor Sam P. Alex
Sam P. Alex 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: 9210716Abstract: A method for managing uplink communication in a wireless communication network is provided. The method includes selecting one or more Mobile Stations (MSs) from a plurality of MSs based on a first signal parameter corresponding to each MS of the one or more MSs, one or more second signal parameters corresponding to each MS of the one or more MSs, and one or more threshold parameters. The first signal parameter is associated with a Base Station (BS) serving a MS. Further, the one or more second signal parameters are associated with one or more BSs neighboring to the MS. The one or more threshold parameters are associated with a communication parameter. Thereafter, the method includes modifying an uplink Modulation and Coding Scheme (MCS) level of the one or more MSs.Type: GrantFiled: March 26, 2015Date of Patent: December 8, 2015Assignee: BROADCOM CORPORATIONInventors: Louay Jalloul, Sriram Mudulodu, Sam P. Alex, Leena Zacharias, Bertrand Hochwald
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Patent number: 9100844Abstract: A method and apparatus of selecting which of a plurality of receiver chains of a mobile unit to receive wireless signals, is disclosed. One method includes measuring a first receive signal quality while all of the plurality of receiver chains are receiving wireless signals, and measuring a second receive signal quality while a subset of the plurality of receiver chains are receiving wireless signals. The subset of the plurality of receiver chains are selected to receive wireless signal unless the first receive signal quality is a threshold better than the second receive signal quality. If the first receive signal quality is a threshold better than the second receive signal quality then all the plurality of receiver chains are selected to receive wireless signals.Type: GrantFiled: July 22, 2013Date of Patent: August 4, 2015Assignee: Broadcom CorporationInventors: Louay Jalloul, Sam P. Alex, Soumen Chakraborty, Sindhu Verman, Manish Airy, Anuj Puri
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Publication number: 20150201423Abstract: A method for managing uplink communication in wireless communication network is provided. The method includes selecting one or more Mobile Stations (MSs) from a plurality of MSs based on a first signal parameter corresponding to each MS of the one or more MSs, one or more second signal parameters corresponding to each MS of the one or more MSs, and one or more threshold parameters. The first signal parameter is associated with a Base Station (BS) serving a MS. Further, the one or more second signal parameters are associated with one or more BSs neighboring to the MS. The one or more threshold parameters are associated with a communication parameter. Thereafter, the method includes modifying uplink Modulation and Coding Scheme (MCS) level of the one or more MSs.Type: ApplicationFiled: March 26, 2015Publication date: July 16, 2015Applicant: Broadcom CorporationInventors: Louay JALLOUL, Sriram MUDULODU, Sam P. ALEX, Leena ZACHARIAS, Bertrand HOCHWALD
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Patent number: 9026123Abstract: A method for managing uplink communication in wireless communication network is provided. The method includes selecting one or more Mobile Stations (MSs) from a plurality of MSs based on a first signal parameter corresponding to each MS of the one or more MSs, one or more second signal parameters corresponding to each MS of the one or more MSs, and one or more threshold parameters. The first signal parameter is associated with a Base Station (BS) serving a MS. Further, the one or more second signal parameters are associated with one or more BSs neighboring to the MS. The one or more threshold parameters are associated with a communication parameter. Thereafter, the method includes modifying uplink Modulation and Coding Scheme (MCS) level of the one or more MSs.Type: GrantFiled: July 9, 2009Date of Patent: May 5, 2015Assignee: Broadcom CorporationInventors: Louay Jalloul, Sriram Mudulodu, Sam P. Alex, Leena Zacharias, Bertrand Hochwald
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Patent number: 8867570Abstract: A method and apparatus of transmitting pilot tones and data in multi-carrier spatial multiplexing transmission is disclosed. The method includes a plurality of subscribers transmitting data to a base station through common frequency sub-carrier and symbol time tiles. Each of the multiple subscribers rotating frequency sub-carrier and symbol time locations of pilot tones within the frequency sub-carrier and symbol time tiles.Type: GrantFiled: June 28, 2007Date of Patent: October 21, 2014Assignee: Broadcom CorporationInventors: Sriram Mudulodu, Rajesh Raja Manakkal, Sam P. Alex, Louay Jalloul
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Publication number: 20140211670Abstract: Provided are various implementations of a wireless network synchronization solution. In one implementation, such a solution includes a mobile communication device including a receiver for use with the wireless network. The receiver is configured to receive a downlink communication from the wireless network, to detect a primary synchronization signal (PSS) at a PSS subframe symbol of the downlink communication, and to detect a secondary synchronization signal (SSS) at an SSS subframe symbol of the downlink communication. The receiver is further configured to identify the downlink communication as being duplexed using one of a first duplexing mode and a second duplexing mode when the PSS subframe symbol follows the SSS subframe symbol, and to identify the downlink communication as being duplexed using the other of the first duplexing mode and the second duplexing mode when the PSS subframe symbol precedes the SSS subframe symbol.Type: ApplicationFiled: January 6, 2014Publication date: July 31, 2014Inventors: Sam P. Alex, Amin Mobasher, Louay Jalloul
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Publication number: 20130329679Abstract: Embodiments for at least one method and apparatus of a subscriber station transceiver allocating and transmitting groups of subcarriers between a plurality of transceiver antennas are disclosed. One method includes the subscriber station transceiver receiving at least one downlink signal through each of the plurality of subscriber station antennas. The subscriber station transceiver characterizes a received signal of the at least one downlink signal over multiple subcarriers. The subscriber station transceiver allocates groups of subcarriers for uplink transmission through each of the plurality of subscriber antennas, wherein the allocation is based on the characterized received signal of the at least one downlink signal over multiple subcarriers.Type: ApplicationFiled: August 19, 2013Publication date: December 12, 2013Applicant: Broadcom CorporationInventors: Sam P. ALEX, Louay JALLOUL, Robert G. LORENZ
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Publication number: 20130308483Abstract: A method and apparatus of selecting which of a plurality of receiver chains of a mobile unit to receive wireless signals, is disclosed. One method includes measuring a first receive signal quality while all of the plurality of receiver chains are receiving wireless signals, and measuring a second receive signal quality while a subset of the plurality of receiver chains are receiving wireless signals. The subset of the plurality of receiver chains are selected to receive wireless signal unless the first receive signal quality is a threshold better than the second receive signal quality. If the first receive signal quality is a threshold better than the second receive signal quality then all the plurality of receiver chains are selected to receive wireless signals.Type: ApplicationFiled: July 22, 2013Publication date: November 21, 2013Applicant: Broadcom CorporationInventors: Louay JALLOUL, Sam P. Alex, Soumen Chakraborty, Sindhu Verma, Manish Airy, Anuj Puri
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Patent number: 8515476Abstract: Embodiments for at least one method and apparatus of a subscriber station transceiver allocating and transmitting groups of subcarriers between a plurality of transceiver antennas are disclosed. One method includes the subscriber station transceiver receiving at least one downlink signal through each of the plurality of subscriber station antennas. The subscriber station transceiver characterizes a received signal of the at least one downlink signal over multiple subcarriers. The subscriber station transceiver allocates groups of subcarriers for uplink transmission through each of the plurality of subscriber antennas, wherein the allocation is based on the characterized received signal of the at least one downlink signal over multiple subcarriers.Type: GrantFiled: June 18, 2012Date of Patent: August 20, 2013Assignee: Broadcom CorporationInventors: Sam P. Alex, Louay Jalloul, Robert Lorenz
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Patent number: 8494466Abstract: A method and apparatus of selecting which of a plurality of receiver chains of a mobile unit to receive wireless signals, is disclosed. One method includes measuring a first receive signal quality while all of the plurality of receiver chains are receiving wireless signals, and measuring a second receive signal quality while a subset of the plurality of receiver chains are receiving wireless signals. The subset of the plurality of receiver chains are selected to receive wireless signal unless the first receive signal quality is a threshold better than the second receive signal quality. If the first receive signal quality is a threshold better than the second receive signal quality then all the plurality of receiver chains are selected to receive wireless signals.Type: GrantFiled: March 26, 2008Date of Patent: July 23, 2013Assignee: Broadcom CorporationInventors: Louay Jalloul, Sam P. Alex, Soumen Chakraborty, Sindhu Verma, Manish Airy, Anuj Puri
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Publication number: 20120257593Abstract: Embodiments for at least one method and apparatus of a subscriber station transceiver allocating and transmitting groups of subcarriers between a plurality of transceiver antennas are disclosed. One method includes the subscriber station transceiver receiving at least one downlink signal through each of the plurality of subscriber station antennas. The subscriber station transceiver characterizes a received signal of the at least one downlink signal over multiple subcarriers. The subscriber station transceiver allocates groups of subcarriers for uplink transmission through each of the plurality of subscriber antennas, wherein the allocation is based on the characterized received signal of the at least one downlink signal over multiple subcarriers.Type: ApplicationFiled: June 18, 2012Publication date: October 11, 2012Applicant: Broadcom CorporationInventors: Sam P. Alex, Louay Jalloul, Robert G. Lorenz
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Patent number: 8204527Abstract: Embodiments for at least one method and apparatus of a subscriber station transceiver allocating and transmitting groups of subcarriers between a plurality of transceiver antennas are disclosed. One method includes the subscriber station transceiver receiving at least one downlink signal through each of the plurality of subscriber station antennas. The subscriber station transceiver characterizes a received signal of the at least one downlink signal over multiple subcarriers. The subscriber station transceiver allocates groups of subcarriers for uplink transmission through each of the plurality of subscriber antennas, wherein the allocation is based on the characterized received signal of the at least one downlink signal over multiple subcarriers.Type: GrantFiled: September 25, 2009Date of Patent: June 19, 2012Assignee: Broadcom CorporationInventors: Sam P. Alex, Louay Jalloul, Robert G. Lorenz
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Patent number: 8139667Abstract: A method and apparatus for estimating frequency offset and timing offset of a first Mobile Station (MS) in a communication system is provided. The method includes receiving a composite signal at a plurality of receiver antennas of a Base Transceiver Station (BTS). The composite signal includes a first signal transmitted from a first MS and a second signal transmitted from a second MS. The composite signal includes one or more tiles. Each tile includes a plurality of data sub-carriers, a plurality of first pilot sub-carriers, and a plurality of second pilot sub-carriers. A total phase offset of the first MS is estimated based on a complex conjugate product of pilot symbols of the plurality of first pilot sub-carriers. Thereafter, a first phase offset corresponding to the timing offset of the first MS is estimated based on a Power Delay Profile (PDP) of one or more first pilot sub-carriers.Type: GrantFiled: November 22, 2010Date of Patent: March 20, 2012Assignee: Broadcom CorporationInventors: Rajesh Raja Manakkal, Louay Jalloul, Sam P. Alex, Anupama Lakshmanan, Djordje Tujkovic, Sriram Mudulodu
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Patent number: 7916774Abstract: A method of estimating a channel between a desired Mobile Station (MS) and a Base Transceiver Station (BTS) antenna of a one of a plurality of sectors of a BTS. The method includes receiving a composite signal at the BTS antenna. The composite signal comprises a desired MS signal and an interfering MS signal. Thereafter, a known desired random sequence and a known interfering random sequence is applied to pilot symbols of the composite signal, resulting in a first de-randomized signal and a second de-randomized signal. Finally, the channel estimate is obtained by weighting and summing the first de-randomized signal and second de-randomized signal.Type: GrantFiled: September 12, 2007Date of Patent: March 29, 2011Assignee: Broadcom CorporationInventors: Rajesh Raja Manakkal, Sam P. Alex, Louay Jalloul
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Publication number: 20110069793Abstract: A method and apparatus for estimating frequency offset and timing offset of a first Mobile Station (MS) in a communication system is provided. The method includes receiving a composite signal at a plurality of receiver antennas of a Base Transceiver Station (BTS). The composite signal includes a first signal transmitted from a first MS and a second signal transmitted from a second MS. The composite signal includes one or more tiles. Each tile includes a plurality of data sub-carriers, a plurality of first pilot sub-carriers, and a plurality of second pilot sub-carriers. A total phase offset of the first MS is estimated based on a complex conjugate product of pilot symbols of the plurality of first pilot sub-carriers. Thereafter, a first phase offset corresponding to the timing offset of the first MS is estimated based on a Power Delay Profile (PDP) of one or more first pilot sub-carriers.Type: ApplicationFiled: November 22, 2010Publication date: March 24, 2011Applicant: BECEEM COMMUNICATIONS INC.Inventors: Rajesh Raja Manakkal, Louay Jalloul, Sam P. Alex
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Publication number: 20110064154Abstract: The invention provides methods and systems for channel estimation. A method comprises receiving a plurality of signal frames, comprising at least a first zone and a second zone, from a plurality of base stations in the wireless communication system. Two or more first delay profiles corresponding to two or more base stations are determined using the first zone. The method further comprising detecting at least one aliased tap in a time domain channel response of the second zone using the two or more first delay profiles. Another method comprises receiving a signal frame, comprising at least a preamble symbol and a data part, from a base station. A first delay profile corresponding to the preamble symbol is determined and a second delay profile corresponding to the data part is obtained. The first delay profile is analyzed in conjunction with the second delay profile to detect one or more aliased taps in a time domain channel response of the data part. The detected one or more aliased taps are nulled/rectified.Type: ApplicationFiled: November 22, 2010Publication date: March 17, 2011Applicant: BECEEM COMMUNICATIONS INC.Inventors: Sriram Mudulodu, Sam P. Alex, Louay Jalloul
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Patent number: 7859990Abstract: The invention provides methods and systems for channel estimation. A method comprises receiving a plurality of signal frames, comprising at least a first zone and a second zone, from a plurality of base stations in the wireless communication system. Two or more first delay profiles corresponding to two or more base stations are determined using the first zone. The method further comprising detecting at least one aliased tap in a time domain channel response of the second zone using the two or more first delay profiles. Another method comprises receiving a signal frame, comprising at least a preamble symbol and a data part, from a base station. A first delay profile corresponding to the preamble symbol is determined and a second delay profile corresponding to the data part is obtained. The first delay profile is analyzed in conjunction with the second delay profile to detect one or more aliased taps in a time domain channel response of the data part. The detected one or more aliased taps are nulled/rectified.Type: GrantFiled: January 23, 2007Date of Patent: December 28, 2010Assignee: BECEEM Communications Inc.Inventors: Sriram Mudulodu, Sam P. Alex, Louay Jalloul
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Patent number: 7852909Abstract: A method and apparatus for estimating frequency offset and timing offset of a first Mobile Station (MS) in a communication system is provided. The method includes receiving a composite signal at a plurality of receiver antennas of a Base Transceiver Station (BTS). The composite signal includes a first signal transmitted from a first MS and a second signal transmitted from a second MS. The composite signal includes one or more tiles. Each tile includes a plurality of data sub-carriers, a plurality of first pilot sub-carriers, and a plurality of second pilot sub-carriers. A total phase offset of the first MS is estimated based on a complex conjugate product of pilot symbols of the plurality of first pilot sub-carriers. Thereafter, a first phase offset corresponding to the timing offset of the first MS is estimated based on a Power Delay Profile (PDP) of one or more first pilot sub-carriers.Type: GrantFiled: December 21, 2007Date of Patent: December 14, 2010Assignee: BECEEM Communications Inc.Inventors: Rajesh Raja Manakkal, Louay Jalloul, Sam P. Alex, Anupama Lakshmanan, Djordje Tujkovic, Sriram Mudulodu
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Patent number: 7783293Abstract: A method and system of training a communication system is disclosed. The method includes a first transceiver transmitting signals through one or more antennas of the first transceiver. A second transceiver selects a subset of a plurality of antennas of the second transceiver, wherein the selected subset provides a largest aggregate received signal power. The second transceiver transmits pilots on a subset of sub-carriers of multi-carrier signals through the selected subset of the plurality of antennas of the second transceiver. The first transceiver receives the pilots, and extracts channel knowledge from the received pilots.Type: GrantFiled: April 26, 2007Date of Patent: August 24, 2010Assignee: BECEEM Communications Inc.Inventors: Djordje Tujkovic, Louay Jalloul, Sam P. Alex, Javvadi Varaprasad
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Publication number: 20100081467Abstract: Embodiments for at least one method and apparatus of a subscriber station transceiver allocating and transmitting groups of subcarriers between a plurality of transceiver antennas are disclosed. One method includes the subscriber station transceiver receiving at least one downlink signal through each of the plurality of subscriber station antennas. The subscriber station transceiver characterizes a received signal of the at least one downlink signal over multiple subcarriers. The subscriber station transceiver allocates groups of subcarriers for uplink transmission through each of the plurality of subscriber antennas, wherein the allocation is based on the characterized received signal of the at least one downlink signal over multiple subcarriers.Type: ApplicationFiled: September 25, 2009Publication date: April 1, 2010Applicant: BECEEM COMMUNICATIONS INC.Inventors: Sam P. Alex, Louay Jalloul, Robert G. Lorenz