Patents by Inventor Jonathan S. Min
Jonathan S. Min 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: 7308053Abstract: Iterative data-aided carrier CFO estimation for CDMA systems. Any communication receiver may be adapted to perform the iterative data-aided carrier CFO estimation. The iterative data-aided carrier CFO estimation is performed using a high accuracy method. The operation may be described as follows: a received signal is despread and buffered. Using the received preamble sequence, an initial estimate of the CFO is obtained. This estimate is used to correct the whole despread data. The corrected data using the initial CFO estimate is sliced. Each despread data symbol is divided by the corresponding sliced data decision. The obtained sequence is then averaged across different codes to obtain a less noisy sequence, which is then used to estimate the CFO again. The procedure can be repeated (iterated) to obtain a more accurate carrier frequency offset estimate; the number of times in which the procedure is repeated may be programmable or predetermined.Type: GrantFiled: November 2, 2006Date of Patent: December 11, 2007Assignee: Broadcom CorporationInventors: Nabil R. Yousef, Jun Ma, Jonathan S. Min
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Patent number: 7257102Abstract: Carrier frequency offset (CFO) estimation from preamble symbols. Any communication receiver may be adapted to perform the CFO estimation. The CFO estimation is performed using a low complexity, high accuracy CFO estimation method. The operation may be described as follows: each element of a received sequence is divided by the corresponding preamble element, the resulting sequence is divided into N subgroups, and each subgroup is then averaged. The phase differential of the resulting sequence is computed, averaged, and used to compute an estimate of the carrier frequency offset. This approach to performing CFO estimation is of relatively high estimation accuracy and of relatively low computational complexity.Type: GrantFiled: April 2, 2002Date of Patent: August 14, 2007Assignee: Broadcom CorporationInventors: Jonathan S. Min, Nabil R. Yousef
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Patent number: 7218694Abstract: A filter settings generation operation includes sampling a communication channel to produce a sampled signal. The sampled signal is spectrally characterized across a frequency band of interest to produce a spectral characterization of the sampled signal. This spectral characterization may not include a signal of interest. The spectral characterization is then modified to produce a modified spectral characterization. Filter settings are then generated based upon the modified spectral characterization. Finally, the communication channel is filtered using the filter settings when the signal of interest is present on the communication channel. In modifying the spectral characterization, pluralities of spectral characteristics of the spectral characterization are independently modified to produce the modified spectral characterization. Modifications to the spectral characterization may be performed in the frequency domain and/or the time domain.Type: GrantFiled: September 14, 2004Date of Patent: May 15, 2007Assignee: Broadcom CorporationInventors: Thomas J. Kolze, Bruce J. Currivan, Jonathan S. Min, Eric Ojard, James Chi Thi, Daniel Howard
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Patent number: 7215725Abstract: A communication device processes a preamble in the presence of impulse noise. The communication device receives a preamble sequence that includes a plurality of preamble symbols and determines that at least one preamble symbol of the plurality of preamble symbols has been adversely affected by impulse noise. Based upon this determination, the communication device masks the at least one preamble symbol of the plurality of preamble symbols to produce a subgroup of preamble symbols. Then, based upon the subgroup of preamble symbols, the communication device determines at least one of a frequency estimate for the subgroup of preamble symbols, a phase estimate for the subgroup of preamble symbols, and a gain estimate for the subgroup of preamble symbols. Based upon these estimates, the communication receiver corrects subgroup of preamble symbols and uses the result to perform channel estimation, to correct subsequently received symbols carrying data, etc.Type: GrantFiled: November 8, 2002Date of Patent: May 8, 2007Assignee: Broadcom CorporationInventors: Nabil R. Yousef, Jonathan S. Min
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Patent number: 7215727Abstract: A communication device constructed according to the present invention detects impulse noise in a preamble sequence. In detecting impulse noise in the preamble sequence the communication device first receive a preamble sequence that includes a plurality of preamble symbols. The communication device then divides the plurality of preamble symbols by at least one known preamble symbol to produce a plurality of preamble gains and/or a plurality of preamble phases corresponding to the plurality of preamble symbols. Finally, the communication device determines, based upon the plurality of preamble gains and/or the plurality of preamble phases, that at least one preamble symbol has been adversely affected by impulse noise. The communication device may discard at least one preamble symbol that has been adversely affected by impulse noise from the plurality of preamble symbols.Type: GrantFiled: November 8, 2002Date of Patent: May 8, 2007Assignee: Broadcom CorporationInventors: Nabil R. Yousef, Jonathan S. Min
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Patent number: 7203227Abstract: All digital reference frequency locking. An all digital approach is provided for operation within one or more CMs within a cable modem communication system to lock the upstream of the one or more CMs to the downstream symbol clock provided from a CMTS. The locking of the CM's upstream may be performed using one of at least three different functions: (1) Locking the upstream symbol clock phase to the downstream symbol clock phase, (2) Locking the downstream symbol clock phase to the headend reference clock phase (typically 10.24 MHz or integer multiple thereof), and (3) Locking the upstream carrier frequency to the downstream symbol clock frequency. The all-digital techniques for supporting all digital reference frequency locking functionality provide high performance to support S-CDMA and other synchronous modulation techniques.Type: GrantFiled: November 14, 2002Date of Patent: April 10, 2007Assignee: Broadcom CorporationInventors: Bruce J. Currivan, Ravi Bhaskaran, Thomas J. Kolze, Kevin Lee Miller, Jeffrey S. Putnam, Fang Lu, Tak K. Lee, Thuji S. Lin, Loke Kun Tan, Gopal Triplicane Venkatesan, Hsin-An Liu, Jonathan S. Min, James P. Cavallo
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Patent number: 7190704Abstract: A method for communicating information is disclosed wherein a time slot is allocated in a time division multiple access system for a transmission from a subscriber to a headend. Synchronization of a clock of the subscriber with respect to a clock of the headend is enhanced using a message transmitted from the headend to the subscriber which is indicative of an error in a subscriber transmission time with respect to the time slot. A feedback loop process is used to determine at least one of fractional symbol timing correction and carrier phase correction of a transmission from the subscriber to the headend. Filter coefficients are generated at the headend from a ranging signal transmitted from the subscriber to the headend and transmitting the filter coefficients from the headend to the subscriber, the filter coefficients being used by the subscriber to compensate for noise in a transmission from the subscriber to the headend.Type: GrantFiled: February 17, 2004Date of Patent: March 13, 2007Assignee: Broadcom CorporationInventors: Theodore F. Rabenko, James C. H. Thi, John D. Horton, Jr., Thomas J. Quigley, Lisa V. Denney, Jonathan S. Min, Christopher R. Jones, Henry Samueli, Fang Lu, Feng Chen, Sean F. Nazareth
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Patent number: 7142618Abstract: A receiver includes a filter for filtering a received signal to produce a filtered signal. A converter converts the filtered signal to a baseband signal that is substantially free of an initial frequency offset and inter-symbol interference (ISI), responsive to a frequency-offset estimate and a restorative signal that compensates for the ISI. A detector detects symbols in the baseband signal to produce a decision signal. A restorative signal generator generates, from the decision signal, the restorative signal responsive to the frequency-offset estimate, such that the restorative signal compensates for the ISI.Type: GrantFiled: December 1, 2003Date of Patent: November 28, 2006Assignee: Broadcom CorporationInventors: Thomas D Kwon, Jonathan S Min, Fang Lu, Thomas J Kolze
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Patent number: 7139339Abstract: Iterative data-aided carrier CFO estimation for CDMA systems. Any communication receiver may be adapted to perform the iterative data-aided carrier CFO estimation. The iterative data-aided carrier CFO estimation is performed using a high accuracy method. The operation may be described as follows: a received signal is despread and buffered. Using the received preamble sequence, an initial estimate of the CFO is obtained. This estimate is used to correct the whole despread data. The corrected data using the initial CFO estimate is sliced. Each despread data symbol is divided by the corresponding sliced data decision. The obtained sequence is then averaged across different codes to obtain a less noisy sequence, which is then used to estimate the CFO again. The procedure can be repeated (iterated) to obtain a more accurate carrier frequency offset estimate; the number of times in which the procedure is repeated may be programmable or predetermined.Type: GrantFiled: April 2, 2002Date of Patent: November 21, 2006Assignee: Broadcom CorporationInventors: Nabil R. Yousef, Jun Ma, Jonathan S. Min
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Patent number: 7139283Abstract: A number of features for enhancing the performance of a cable transmission system in which data is transmitted between a cable modem termination system at a headend and a plurality of cable modems located different distances from the headend. The power transmission level, slot timing, and equalization of the cable modems are set by a ranging process. Data is transmitted by the modems in fragmented form. Various measures are taken to make transmission from the cable modems robust. The upstream data transmission is controlled to permit multiple access from the cable modems.Type: GrantFiled: February 9, 2001Date of Patent: November 21, 2006Assignee: Broadcom CorporationInventors: Thomas J. Quigley, Jonathan S. Min, Lisa V. Denney, Henry Samueli, Sean F. Nazareth, Feng Chen, Fang Lu, Christopher R. Jones
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Patent number: 7136432Abstract: A method of parameter estimation in a shared channel communications system includes the steps of receiving a preamble including a first sequence corresponding to a sequence having zero autocorrelation, a second sequence having zero autocorrelation, and a third sequence having zero autocorrelation, performing a coarse carrier frequency estimate based on the first sequence, and performing a fine carrier frequency estimate based on the second and third sequences.Type: GrantFiled: June 7, 2002Date of Patent: November 14, 2006Assignee: Broadcom CorporationInventors: Jonathan S. Min, Fang Lu, Bruce J. Currivan, Tom Kwon
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Patent number: 7120123Abstract: A number of features for enhancing the performance of a cable transmission system in which data is transmitted between a cable modem termination system at a headend and a plurality of cable modems located different distances from the headend. The power transmission level, slot timing, and equalization of the cable modems are set by a ranging process. Data is transmitted by the modems in fragmented form. Various measures are taken to make transmission from the cable modems robust. The upstream data transmission is controlled to permit multiple access from the cable modems.Type: GrantFiled: November 9, 2000Date of Patent: October 10, 2006Assignee: Broadcom CorporationInventors: Thomas J. Quigley, Jonathan S. Min, Lisa V. Denney, Henry Samueli, Sean F. Nazareth, Feng Chen, Fang Lu, Christopher R. Jones
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Patent number: 7104534Abstract: A system for detecting collisions in a shared communications medium, such as a TDMA medium, includes a receive path adapted to generate a first intermediate signal, a second intermediate signal, and a data symbol sequence from an input signal. A preamble detection module generates a correlation metric from the first intermediate signal. A power measurement module generates a power indication signal from the second intermediate signal. A noise measurement module generates a noise indication signal from the second intermediate signal and the data symbol sequence. A processing module is adapted to characterize the input signal as a collision for certain values of correlation metric, power indication signal, and noise indication signal.Type: GrantFiled: July 30, 2001Date of Patent: September 12, 2006Assignee: Broadcom CorporationInventors: Bruce J. Currivan, Jonathan S. Min, Fang Lu
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Patent number: 7103065Abstract: A number of features for enhancing the performance of a cable transmission system in which data is transmitted between a cable modem termination system at a headend and a plurality of cable modems located different distances from the headend. The power transmission level, slot timing, and equalization of the cable modems are set by a ranging process. Data is transmitted by the modems in fragmented form. Various measures are taken to make transmission from the cable modems robust. The upstream data transmission is controlled to permit multiple access from the cable modems.Type: GrantFiled: November 16, 2000Date of Patent: September 5, 2006Assignee: Broadcom CorporationInventors: Thomas J. Quigley, Jonathan S. Min, Lisa V. Denney, Henry Samueli, Sean F. Nazareth, Feng Chen, Fang Lu, Christopher R. Jones
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Patent number: 6965616Abstract: A number of features for enhancing the performance of a cable transmission system in which data is transmitted between a cable modem termination system at a headend and a plurality of cable modems located different distances from the headend. The power transmission level, slot timing, and equalization of the cable modems are set by a ranging process. Data is transmitted by the modems in fragmented form. Various measures are taken to make transmission from the cable modems robust. The upstream data transmission is controlled to permit multiple access from the cable modems.Type: GrantFiled: October 6, 2000Date of Patent: November 15, 2005Assignee: Broadcom CorporationInventors: Thomas J. Quigley, Jonathan S. Min, Lisa V. Denney, Henry Samueli, Sean F. Nazareth, Feng Chen, Fang Lu, Christopher R. Jones
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Patent number: 6961314Abstract: A number of features for enhancing the performance of a cable transmission system in which data is transmitted between a cable modem termination system at a headend and a plurality of cable modems located different distances from the headend. The power transmission level, slot timing, and equalization of the cable modems are set by a ranging process. Data is transmitted by the modems in fragmented form. Various measures are taken to make transmission from the cable modems robust. The upstream data transmission is controlled to permit multiple access from the cable modems.Type: GrantFiled: August 25, 2000Date of Patent: November 1, 2005Assignee: Broadcom CorporationInventors: Thomas J. Quigley, Jonathan S. Min, Lisa V. Denney, Henry Samueli, Sean F. Nazareth, Feng Chen, Fang Lu, Christopher R. Jones
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Patent number: 6798854Abstract: A filter settings generation operation includes sampling a communication channel to produce a sampled signal. The sampled signal is spectrally characterized across a frequency band of interest to produce a spectral characterization of the sampled signal. This spectral characterization may not include a signal of interest. The spectral characterization is then modified to produce a modified spectral characterization. Filter settings are then generated based upon the modified spectral characterization. Finally, the communication channel is filtered using the filter settings when the signal of interest is present on the communication channel. In modifying the spectral characterization, pluralities of spectral characteristics of the spectral characterization are independently modified to produce the modified spectral characterization. Modifications to the spectral characterization may be performed in the frequency domain and/or the time domain.Type: GrantFiled: June 11, 2001Date of Patent: September 28, 2004Assignee: Broadcom CorporationInventors: Thomas J. Kolze, Bruce J. Currivan, Jonathan S. Min, Eric Ojard, James Chi Thi, Daniel Howard
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Publication number: 20040163120Abstract: A method for communicating information is disclosed wherein a time slot is allocated in a time division multiple access system for a transmission from a subscriber to a headend. Synchronization of a clock of the subscriber with respect to a clock of the headend is enhanced using a message transmitted from the headend to the subscriber which is indicative of an error in a subscriber transmission time with respect to the time slot. A feedback loop process is used to determine at least one of fractional symbol timing correction and carrier phase correction of a transmission from the subscriber to the headend. Filter coefficients are generated at the headend from a ranging signal transmitted from the subscriber to the headend and transmitting the filter coefficients from the headend to the subscriber, the filter coefficients being used by the subscriber to compensate for noise in a transmission from the subscriber to the headend.Type: ApplicationFiled: February 17, 2004Publication date: August 19, 2004Applicant: Broadcom CorporationInventors: Theodore F. Rabenko, James C. H. Thi, John D. Horton, Thomas J. Quigley, Lisa V. Denney, Jonathan S. Min, Christopher R. Jones, Henry Samueli, Fang Lu, Feng Chen, Sean F. Nazareth
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Patent number: 6763032Abstract: A method for communicating information is disclosed wherein a time slot is allocated in a time division multiple access system for a transmission from a subscriber to a headend. Synchronization of a clock of the subscriber with respect to a clock of the headend is enhanced using a message transmitted from the headend to the subscriber which is indicative of an error in a subscriber transmission time with respect to the time slot. A feedback loop process is used to determine at least one of fractional symbol timing correction and carrier phase correction of a transmission from the subscriber to the headend. Filter coefficients are generated at the headend from a ranging signal transmitted from the subscriber to the headend and transmitting the filter coefficients from the headend to the subscriber, the filter coefficients being used by the subscriber to compensate for noise in a transmission from the subscriber to the headend.Type: GrantFiled: February 10, 2000Date of Patent: July 13, 2004Assignee: Broadcom CorporationInventors: Theodore F. Rabenko, James C. H. Thi, John D. Horton, Jr., Thomas J. Quigley, Lisa V. Denney, Jonathan S. Min, Christopher R. Jones, Henry Samueli, Fang Lu, Feng Chen, Sean F. Nazareth
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Publication number: 20040114696Abstract: A receiver includes a filter for filtering a received signal to produce a filtered signal. A converter converts the filtered signal to a baseband signal that is substantially free of an initial frequency offset and inter-symbol interference (ISI), responsive to a frequency-offset estimate and a restorative signal that compensates for the ISI. A detector detects symbols in the baseband signal to produce a decision signal. A restorative signal generator generates, from the decision signal, the restorative signal responsive to the frequency-offset estimate, such that the restorative signal compensates for the ISI.Type: ApplicationFiled: December 1, 2003Publication date: June 17, 2004Inventors: Thomas D. Kwon, Jonathan S. Min, Fang Lu, Thomas J. Kolze