Patents Assigned to Lot 41 Acquisition Foundation, LLC
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Patent number: 8098751Abstract: Techniques for reducing peak-to-average power in multicarrier transmitters employ peak cancellation with subcarriers that are impaired by existing channel conditions. The use of Carrier Interferometry (CI) coding further improves the effectiveness of peak reduction. CI coding can also be impressed onto pulse sequences in the time domain, which enhances spectral selection and facilitates peak-power control.Type: GrantFiled: July 22, 2008Date of Patent: January 17, 2012Assignee: Lot 41 Acquisition Foundation, LLCInventor: Steve Shattil
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Patent number: 7965761Abstract: Carrier Interferometry (CI) provides wideband transmission protocols with frequency-band selectivity to improve interference rejection, reduce multipath fading, and enable operation across non-continuous frequency bands. Direct-sequence protocols, such as DS-CDMA, are provided with CI to greatly improve performance and reduce transceiver complexity. CI introduces families of orthogonal polyphase codes that can be used for channel coding, spreading, and/or multiple access. Unlike conventional DS-CDMA, CI coding is not necessary for energy spreading because a set of CI carriers has an inherently wide aggregate bandwidth. Instead, CI codes are used for channelization, energy smoothing in the frequency domain, and interference suppression. CI-based ultra-wideband protocols are implemented via frequency-domain processing to reduce synchronization problems, transceiver complexity, and poor multipath performance of conventional ultra-wideband systems.Type: GrantFiled: December 5, 2008Date of Patent: June 21, 2011Assignee: Lot 41 Acquisition Foundation, LLCInventor: Steve Shattil
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Patent number: 7787514Abstract: An adaptation to Carrier Interferometry synthesis and analysis provides for frequency-varying subcarriers. Coding and decoding functionality can be extended to orthogonal chirped and frequency-hopped waveforms. Poly-amplitude codes permit successive interference cancellation in spatial and frequency-domain processing. Dynamic re-sectorization and bandwidth exchange are facilitated by subcarrier allocation.Type: GrantFiled: October 30, 2003Date of Patent: August 31, 2010Assignee: Lot 41 Acquisition Foundation, LLCInventor: Steve Shattil
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Publication number: 20090110033Abstract: Carrier Interferometry (CI) provides wideband transmission protocols with frequency-band selectivity to improve interference rejection, reduce multipath fading, and enable operation across non-continuous frequency bands. Direct-sequence protocols, such as DS-CDMA, are provided with CI to greatly improve performance and reduce transceiver complexity. CI introduces families of orthogonal polyphase codes that can be used for channel coding, spreading, and/or multiple access. Unlike conventional DS-CDMA, CI coding is not necessary for energy spreading because a set of CI carriers has an inherently wide aggregate bandwidth. Instead, CI codes are used for channelization, energy smoothing in the frequency domain, and interference suppression. CI-based ultra-wideband protocols are implemented via frequency-domain processing to reduce synchronization problems, transceiver complexity, and poor multipath performance of conventional ultra-wideband systems.Type: ApplicationFiled: December 5, 2008Publication date: April 30, 2009Applicant: Lot 41 Acquisition Foundation, LLCInventor: Steve Shattil
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Publication number: 20080310484Abstract: Techniques for reducing peak-to-average power in multicarrier transmitters employ peak cancellation with subcarriers that are impaired by existing channel conditions. The use of Carrier Interferometry (CI) coding further improves the effectiveness of peak reduction. CI coding can also be impressed onto pulse sequences in the time domain, which enhances spectral selection and facilitates peak-power control.Type: ApplicationFiled: July 22, 2008Publication date: December 18, 2008Applicant: LOT 41 ACQUISITION FOUNDATION, LLCInventor: Steve J. Shattil
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Patent number: 7459525Abstract: The invention concerns glycosylated proteins having human factor VIII activity. In a preferred embodiment, the protein is glycosylated with oligosaccharides that include an alpha-(2,6)-linked sialic acid and a bisecting GlcNAc linked to a core beta-mannose.Type: GrantFiled: August 22, 2002Date of Patent: December 2, 2008Assignee: Lot 41 Acquisition Foundation, LLCInventors: Myung-Sam Cho, Sham-Yuen Chan
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SPREAD SPECTRUM COMMUNICATION METHOD AND SYSTEM USING DIVERSITY CORRELATION AND MULTI-USER DETECTION
Publication number: 20080285631Abstract: A communication system transmits and receives a plurality of spread-spectrum signals having differences in at least one diversity parameter. The signals are highly correlated when their diversity parameters are similar, and the signals are uncorrelated when at least one diversity parameter is different Any combination of a transmitter, a receiver, and a communication channel may diversity-encode the signals to effect differences in their diversity parameters. A receiver diversity-decoder compensates for differences in a diversity-parameter of at least one received signal to make the signal highly correlated with at least one other received signal. A correlator combines at least two of the received signals to recover an embedded information signal. The communication system enables the use of true-noise signals for spreading information signals, provides simplified receiver designs, and enables antenna arrays to spatially process spread-spectrum signals.Type: ApplicationFiled: May 16, 2008Publication date: November 20, 2008Applicant: Lot 41 Acquisition Foundation, LLC.Inventor: STEVE J. SHATTIL -
Patent number: 7430257Abstract: Carrier Interferometry (CI) provides wideband transmission protocols with frequency-band selectivity to improve interference rejection, reduce multipath fading, and enable operation across non-continuous frequency bands. Direct-sequence protocols, such as DS-CDMA, are provided with CI to greatly improve performance and reduce transceiver complexity. CI introduces families of orthogonal polyphase codes that can be used for channel coding, spreading, and/or multiple access. Unlike conventional DS-CDMA, CI coding is not necessary for energy spreading because a set of CI carriers has an inherently wide aggregate bandwidth. Instead, CI codes are used for channelization, energy smoothing in the frequency domain, and interference suppression. CI-based ultra-wideband protocols are implemented via frequency-domain processing to reduce synchronization problems, transceiver complexity, and poor multipath performance of conventional ultra-wideband systems.Type: GrantFiled: April 24, 2002Date of Patent: September 30, 2008Assignee: Lot 41 Acquisition Foundation, LLCInventor: Steve Shattil
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Patent number: 7418043Abstract: Techniques for reducing peak-to-average power in multicarrier transmitters employ peak cancellation with subcarriers that are impaired by existing channel conditions. The use of Carrier Interferometry (CI) coding further improves the effectiveness of peak reduction. CI coding can also be impressed onto pulse sequences in the time domain, which enhances spectral selection and facilitates peak-power control.Type: GrantFiled: December 8, 2003Date of Patent: August 26, 2008Assignee: Lot 41 Acquisition Foundation, LLCInventor: Steve J Shattil
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Patent number: 7406261Abstract: A wireless communication system transmits data on multiple carriers simultaneously to provide frequency diversity. Orthogonality is provided by carrier interference, which causes a narrow pulse in the time domain corresponding to each transmitted data symbol. Selection of the frequency separation and phases of the carriers controls the timing of the pulses. Equivalently, pulse waveforms may be generated from an appropriate selection of polyphase sub-carrier codes. Time division of the pulses and frequency division of the carriers may be employed for multiple access. Received signals are processed by combining frequency-domain components corresponding to a desired user's allocated carriers. Individual data symbols are processed by providing polyphase decoding, matched filtering, or time-domain shifting the received carriers. Carrier Interferometry components may be used to build various signals corresponding to other transmission protocols.Type: GrantFiled: February 7, 2003Date of Patent: July 29, 2008Assignee: Lot 41 Acquisition Foundation, LLCInventor: Steve J Shattil
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Spread spectrum communication method and system using diversity correlation and multi-user detection
Patent number: 7391804Abstract: A communication system transmits and receives a plurality of spread-spectrum signals having differences in at least one diversity parameter. The signals are highly correlated when their diversity parameters are similar, and the signals are uncorrelated when at least one diversity parameter is different. Any combination of a transmitter, a receiver, and a communication channel may diversity-encode the signals to effect differences in their diversity parameters. A receiver diversity-decoder compensates for differences in a diversity-parameter of at least one received signal to make the signal highly correlated with at least one other received signal. A correlator combines at least two of the received signals to recover an embedded information signal. The communication system enables the use of true-noise signals for spreading information signals, provides simplified receiver designs, and enables antenna arrays to spatially process spread-spectrum signals.Type: GrantFiled: April 2, 2001Date of Patent: June 24, 2008Assignee: Lot 41 Acquisition Foundation, LLCInventor: Steve J. Shattil -
Patent number: 7317750Abstract: An adaptation to Carrier Interferometry synthesis and analysis provides for complex coding and decoding in a sliding window transform. Coding and decoding functionality can be extended to spatial processing in systems employing multiple transceiver elements. Poly-amplitude codes permit successive interference cancellation in spatial and frequency-domain processing. Handoffs in cellular systems are facilitated by selecting spectral/base station combinations that optimize link performance.Type: GrantFiled: April 16, 2003Date of Patent: January 8, 2008Assignee: Lot 41 Acquisition Foundation, LLCInventor: Steve J Shattil
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Patent number: 7283799Abstract: Substantial improvements in frequency reuse in microwave communications systems is achieved by canceling co-channel interference and transmitter leakage. Interferometric beam-narrowing reduces beamwidth without reducing peak magnitude of the beam pattern. Frequency-dependent beam-shaping compensates for frequency-dependent distortions of the beam pattern thereby improving bandwidth. A spatial demultiplexing technique utilizes spatial gain distributions of received signals to separate signals, even from co-located transmit sources, and uses microwave lensing to enhance received spatial gain distributions. Predetermined cross-polarization interference is used to separate differently-polarized receive signals. A reference branch provides a cancellation signal to a receiver to cancel transmitter leakage signals. An error signal controls an impedance-compensation circuit that is responsive to changes in antenna impedance but not to receive signals.Type: GrantFiled: April 7, 2005Date of Patent: October 16, 2007Assignee: Lot 41 Acquisition Foundation, LLCInventor: Steve J. Shattil