Patents by Inventor David HAHM
David HAHM 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: 7532638Abstract: A baseband processing module for use within a Radio Frequency (RF) transceiver includes a downlink/uplink interface, TX processing components, a processor, memory, RX processing components, and a turbo decoding module. The RX processing components receive a baseband RX signal from the RF front end, produce a set of IR samples from the baseband RX signal, and transfer the set of IR samples to the memory. The turbo decoding module receives at least one set of IR samples from the memory, forms a turbo code word from the at least one set of IR samples, turbo decodes the turbo code word to produce inbound data, and outputs the inbound data to the downlink/uplink interface. The turbo decoding module performs metric normalization based upon a chosen metric, performs de-rate matching, performs error detection operations, and extracts information from a MAC packet that it produces.Type: GrantFiled: June 1, 2005Date of Patent: May 12, 2009Assignee: Broadcom CorporationInventors: Mark David Hahm, Li Fung Chang, Michiel Lotter
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Patent number: 7515601Abstract: A baseband processing module for use within a Radio Frequency (RF) transceiver includes a downlink/uplink interface, TX processing components, a processor, memory, RX processing components, and a turbo decoding module. The RX processing components receive a baseband RX signal from the RF front end, produce a set of IR samples from the baseband RX signal, and transfer the set of IR samples to the memory. The turbo decoding module receives at least one set of IR samples from the memory, forms a turbo code word from the at least one set of IR samples, turbo decodes the turbo code word to produce inbound data, and outputs the inbound data to the downlink/uplink interface. The turbo decoding module performs metric normalization based upon a chosen metric performs error detection operations, and extracts information from a MAC packet that it produces.Type: GrantFiled: May 31, 2005Date of Patent: April 7, 2009Assignee: Broadcom CorporationInventors: Jie Lai, Mark David Hahm
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Publication number: 20090034501Abstract: A wireless terminal is operable to receive a Wideband Code Division Multiple Access (WCDMA) signal from a base station and includes clock circuitry, a wireless interface, and a Primary Synchronization (PSYNC) module. The clock circuitry generates a wireless terminal clock using a wireless terminal oscillator. The wireless interface receives the WCDMA signal, which is produced by the base station using a base station clock that is produced using a base station oscillator that is more accurate than the wireless terminal oscillator. The PSYNC module includes a plurality of PSYNC correlation branches. Each PSYNC correlation branch phase rotates the WCDMA signal based upon a respective frequency offset, correlates the phase rotated WCDMA signal with a Primary Synchronization Channel (PSCH) code over a plurality of sampling positions, and produces PSYNC correlation energies based upon the correlations for each of the plurality of sampling positions.Type: ApplicationFiled: August 23, 2007Publication date: February 5, 2009Applicant: BROADCOM CORPORATIONInventors: Mark David Hahm, Wei Luo
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Publication number: 20090034589Abstract: A wireless terminal is operable to receive a Wideband Code Division Multiple Access (WCDMA) signal from a base station and includes clock circuitry, a wireless interface, and a Primary Synchronization (PSYNC) module. The clock circuitry generates a wireless terminal clock using a wireless terminal oscillator. The wireless interface receives the WCDMA signal, which is produced by the base station using a base station clock that is produced using a base station oscillator that is more accurate than the wireless terminal oscillator. The PSYNC module includes a plurality of PSYNC correlation branches. Each PSYNC correlation branch phase rotates the WCDMA signal based upon a respective frequency offset, correlates the phase rotated WCDMA signal with a Primary Synchronization Channel (PSCH) code over a plurality of sampling positions, and produces PSYNC correlation energies based upon the correlations for each of the plurality of sampling positions.Type: ApplicationFiled: September 10, 2007Publication date: February 5, 2009Applicant: BROADCOM CORPORATIONInventors: Mark David Hahm, Wei Luo, Li Fung Chang, Nelson R. Sollenberger, Hendrik Johannes Conroy
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Publication number: 20090034482Abstract: A wireless terminal is operable to receive a Wideband Code Division Multiple Access (WCDMA) signal from a base station and includes clock circuitry, a wireless interface, and a Primary Synchronization (PSYNC) module. The clock circuitry generates a wireless terminal clock using a wireless terminal oscillator. The wireless interface receives the WCDMA signal, which is produced by the base station using a base station clock that is produced using a base station oscillator that is more accurate than the wireless terminal oscillator. The PSYNC module includes a plurality of PSYNC correlation branches. Each PSYNC correlation branch phase rotates the WCDMA signal based upon a respective frequency offset, correlates the phase rotated WCDMA signal with a Primary Synchronization Channel (PSCH) code over a plurality of sampling positions, and produces PSYNC correlation energies based upon the correlations for each of the plurality of sampling positions.Type: ApplicationFiled: August 23, 2007Publication date: February 5, 2009Applicant: BROADCOM CORPORATIONInventors: Mark David Hahm, Wei Luo, Hendrik Johannes Conroy
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Publication number: 20090034490Abstract: A wireless terminal is operable to receive a Wideband Code Division Multiple Access (WCDMA) signal from a base station and includes clock circuitry, a wireless interface, and a Primary Synchronization (PSYNC) module. The clock circuitry generates a wireless terminal clock using a wireless terminal oscillator. The wireless interface receives the WCDMA signal, which is produced by the base station using a base station clock that is produced using a base station oscillator that is more accurate than the wireless terminal oscillator. The PSYNC module includes a plurality of PSYNC correlation branches. Each PSYNC correlation branch phase rotates the WCDMA signal based upon a respective frequency offset, correlates the phase rotated WCDMA signal with a Primary Synchronization Channel (PSCH) code over a plurality of sampling positions, and produces PSYNC correlation energies based upon the correlations for each of the plurality of sampling positions.Type: ApplicationFiled: August 23, 2007Publication date: February 5, 2009Applicant: BROADCOM CORPORATIONInventors: Mark David Hahm, Wei Luo, Hendrik Johannes Conroy
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Publication number: 20080075216Abstract: A system for processing radio frequency (RF) signals includes a searcher and a plurality of Cluster Path Processor (CPPs). The searcher detects a maximum signal energy level and position of at least one of a plurality of individual distinct path signals in a signal cluster of a first information signal, wherein at least a portion of the plurality of individual distinct path signals is received within a duration of a corresponding delay spread. The sampling position is used as a starting sampling location by the plurality of CPPs, including a first information signal CPP and a second information signal CPP. Fine sampling positions of the plurality of CPPs are based upon channel energy estimates for the plurality of individual distinct path signals. CPP outputs are employed to produce channel estimates, which are themselves used in subsequent equalization operations. Sampling positions may change over time in order to satisfy alignment criteria.Type: ApplicationFiled: March 29, 2007Publication date: March 27, 2008Applicant: Broadcom Corporation, a California CorporationInventors: Junqiang Li, Nelson R. Sollenberger, Li Fung Chung, Mark David Hahm, Hongwei Kong
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Publication number: 20080075209Abstract: A Radio Frequency (RF) receiver includes a RF front end and a baseband processing module coupled to the RF front end that is operable to receive a time domain signal that includes time domain training symbols and time domain data symbols. The baseband processing module includes a channel estimator operable to process the time domain training symbols to produce a time domain channel estimate, a Fast Fourier Transformer operable to convert the time domain channel estimate to the frequency domain to produce a frequency domain channel estimate, a weight calculator operable to produce frequency domain equalizer coefficients based upon the frequency domain channel estimate, an Inverse Fast Fourier Transformer operable to converting the frequency domain equalizer coefficients to the time domain to produce time domain equalizer coefficients, and an equalizer operable to equalize the time domain data symbols using the time domain equalizer coefficients.Type: ApplicationFiled: September 21, 2006Publication date: March 27, 2008Applicant: Broadcom Corporation, a California CorporationInventors: Junqiang Li, Mark David Hahm, Nelson R. Sollenberger, Li Fung Chang
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Publication number: 20080075148Abstract: A system for processing radio frequency (RF) signals includes a searcher and a Cluster Path Processor (CPP). The searcher detects a maximum signal energy level and position of at least one of a plurality of individual distinct path signals in a signal cluster, wherein at least a portion of the plurality of individual distinct path signals is received within a duration of a corresponding delay spread. The CPP includes a group finger array having a plurality of group fingers and determines a coarse sampling position of the group finger array based upon the position of the at least one of a plurality of individual distinct path signals in the signal cluster. The CPP determines a fine sampling position based upon determines a composite channel energy estimate for the plurality of individual distinct path signals. Using this fine sampling position, the CPP receives at least a portion of the plurality of individual distinct path signals by the group finger array.Type: ApplicationFiled: September 21, 2006Publication date: March 27, 2008Applicant: Broadcom Corporation, a California CorporationInventors: Junqiang Li, Mark David Hahm, Li Fung Chang
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Patent number: 6356606Abstract: A method and device for limiting peaks of an input signal. The device and method isolate peaks of an input signal based on a clipping threshold voltage, generate an extrema signal representing the local extrema of the peak isolated signal, filter the extrema signal based on an appropriate impulse filter response to generate a filter signal, and combine the filter signal with the input signal delayed by a predetermined time period to generate an impulse clipped signal. The impulse clipped signal has a reduced P/A ratio and is without significant out-of-band spectrum artifacts.Type: GrantFiled: July 31, 1998Date of Patent: March 12, 2002Assignee: Lucent Technologies Inc.Inventor: Mark David Hahm
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Patent number: 6311202Abstract: A Fast Hadamard Transform apparatus having a plurality of transform stages, such as would be employed by a wireless telecommunication system for detecting and correcting errors that occur during the transmission of coded signal blocks, such as a Walsh codeword. Each stage of the apparatus comprises an adder and a subtractor, each having an output terminal. The adder and the subtractor are configured to receive signal pairs and generate intermediate coefficients. A first memory unit is coupled to the output terminal of the adder and to the output terminal of the subtractor, and is configured to receive a first specifiable sequence of the intermediate coefficients from the adder and a second specifiable sequence of the intermediate coefficients from the subtractor. A second memory unit is coupled to the output terminal of the subtractor so as to receive a third specifiable sequence of the intermediate coefficients from the subtractor.Type: GrantFiled: March 12, 1999Date of Patent: October 30, 2001Assignee: Lucent Technologies Inc.Inventor: Mark David Hahm