Patents by Inventor Kofi Anim-Appiah
Kofi Anim-Appiah 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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Publication number: 20190199573Abstract: A transmitter in a Digital Subscriber Line (DSL) system includes a rate encoder configured to generate a first set of encoded bits using a set of least significant bits, a trellis shaper configured to generate a second set of encoded bits using a most significant bit and the first set of encoded bits, a first constellation mapper configured to generate a first point described by integer coordinates in a complex plane based on the first set of encoded bits obtained from the rate encoder, a second constellation mapper configured to generate a second point described by integer coordinates in the complex plane after interleaving two bits from the second set of encoded bits obtained from the trellis shaper, and a merger module configured to merge the first point with the second point to generate a symbol. The symbol represents a third point described by integer coordinates in the complex plane.Type: ApplicationFiled: December 26, 2018Publication date: June 27, 2019Inventors: Ruosi Liu, Jianhua Liu, Bin Zhou, Kofi Anim-Appiah, Amir H. Fazlollahi
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Patent number: 10181973Abstract: A transmitter in a Digital Subscriber Line (DSL) system includes a rate encoder configured to generate a first set of encoded bits using a set of least significant bits, a trellis shaper configured to generate a second set of encoded bits using a most significant bit and the first set of encoded bits, a first constellation mapper configured to generate a first point described by integer coordinates in a complex plane based on the first set of encoded bits obtained from the rate encoder, a second constellation mapper configured to generate a second point described by integer coordinates in the complex plane after interleaving two bits from the second set of encoded bits obtained from the trellis shaper, and a merger module configured to merge the first point with the second point to generate a symbol. The symbol represents a third point described by integer coordinates in the complex plane.Type: GrantFiled: June 8, 2016Date of Patent: January 15, 2019Assignee: Futurewei Technologies, Inc.Inventors: Ruosi Liu, Jianhua Liu, Bin Zhou, Kofi Anim-Appiah, Amir H. Fazlollahi
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Patent number: 9641286Abstract: A transmitter including a noise signal generator and a summing element is provided. The noise signal generator is configured to receive multiple noise settings and output multiple noise signals corresponding to the multiple noise settings. The summing element is configured to receive a transmit data signal and the multiple noise signals, sum one or more of the multiple noise signals with the transmit data signal, and output to a transmit driver configured to generate one of a single-ended and a differential signal based on the sum of the one or more of the multiple noise signals with the transmit data signal.Type: GrantFiled: May 27, 2015Date of Patent: May 2, 2017Assignee: Futurewei Technologies, Inc.Inventors: Hiroshi Takatori, Kofi Anim-Appiah, Hang Yan
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Publication number: 20160366005Abstract: A transmitter in a Digital Subscriber Line (DSL) system includes a rate encoder configured to generate a first set of encoded bits using a set of least significant bits, a trellis shaper configured to generate a second set of encoded bits using a most significant bit and the first set of encoded bits, a first constellation mapper configured to generate a first point described by integer coordinates in a complex plane based on the first set of encoded bits obtained from the rate encoder, a second constellation mapper configured to generate a second point described by integer coordinates in the complex plane after interleaving two bits from the second set of encoded bits obtained from the trellis shaper, and a merger module configured to merge the first point with the second point to generate a symbol. The symbol represents a third point described by integer coordinates in the complex plane.Type: ApplicationFiled: June 8, 2016Publication date: December 15, 2016Inventors: Ruosi Liu, Jianhua Liu, Bin Zhou, Kofi Anim-Appiah, Amir H. Fazlollahi
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Patent number: 9172498Abstract: A transmitter comprising a noise signal generator, a summing element configured to generate a signal as a sum of an output of the noise signal generator and a transmit data signal, and a transmit driver configured to generate an output signal based on the sum. Also, a method of calibrating a signal-to-noise ratio (SNR) for a transmitter comprising transmitting a first signal comprising a data signal with no noise signal, capturing the first signal, transmitting a second signal comprising a noise signal, wherein both an amplitude and a phase of the noise signal have been adjusted by a gain and phase control element, capturing the second signal, and determining the SNR corresponding to the captured first signal and the captured second signal, wherein the transmitter transmits the second signal using a transmit driver.Type: GrantFiled: March 28, 2013Date of Patent: October 27, 2015Assignee: Futurewei Technologies, Inc.Inventors: Hiroshi Takatori, Kofi Anim-Appiah, Hang Yan
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Publication number: 20150280870Abstract: A transmitter including a noise signal generator and a summing element is provided. The noise signal generator is configured to receive multiple noise settings and output multiple noise signals corresponding to the multiple noise settings. The summing element is configured to receive a transmit data signal and the multiple noise signals, sum one or more of the multiple noise signals with the transmit data signal, and output to a transmit driver configured to generate one of a single-ended and a differential signal based on the sum of the one or more of the multiple noise signals with the transmit data signal.Type: ApplicationFiled: May 27, 2015Publication date: October 1, 2015Inventors: Hiroshi Takatori, Kofi Anim-Appiah, Hang Yan
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Publication number: 20130259155Abstract: A transmitter comprising a noise signal generator, and a transmit driver coupled to an output of the noise signal generator.Type: ApplicationFiled: March 28, 2013Publication date: October 3, 2013Applicant: Futurewei Technologies, Inc.Inventors: Hiroshi Takatori, Kofi Anim-Appiah, Hang Yan
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Patent number: 7340236Abstract: The present invention provides a system for providing simultaneous operation of disparate wireless telecommunication technologies within a single device (102). The device comprises a plurality of antennas (112, 114). The system provides an antenna switching function (116) communicatively coupled to the plurality of antennas. A first wireless telecommunications function (104) is communicatively coupled to the antenna switching function, as is a second wireless telecommunications function (106). The system provides an arbitration function (118) communicatively coupled to the antenna switching function and the first and second wireless telecommunications functions. A defined prioritization scheme is provided. The arbitration function operates to control access to the plurality of antennas by the first and second wireless telecommunications functions according to the defined prioritization scheme.Type: GrantFiled: August 5, 2003Date of Patent: March 4, 2008Assignee: Texas Instruments IncorporatedInventors: Jie Liang, Matthew B. Shoemake, Kofi Anim-Appiah, Anuj Batra
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Patent number: 7272358Abstract: A four channel wireless network channelization scheme is described that is particularly usable in the ISM frequency band between 2400 MHz and 2483.5 MHz. The preferred channelization scheme permits access points to be set at one of four frequencies in the ISM band, not three as taught by the IEEE 802.11b standard. This channelization scheme takes advantage of the fact that only 20 MHz is typically needed between adjacent access point channels, not 25 MHz as is taught by the 802.11b standard. With four channels to choose from, a higher density of access points can be located thereby accommodating a higher density of users. The four channels preferably are 2407, 2427, 2447 and 2467 MHz. With this selection of channel frequencies and given the current FCC regulations, all four channels can be used to transmit an equal amount of power.Type: GrantFiled: July 31, 2002Date of Patent: September 18, 2007Assignee: Texas Instruments IncorporatedInventors: Anuj Batra, Kofi Anim-Appiah, Matthew B. Shoemake
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Publication number: 20070174375Abstract: Systems and methods are provided for determining effective tap values for a digital filter. A first plurality of vectors is generated, wherein each of the first plurality of vectors represents a set of tap values for the filter at a first resolution. A best vector is selected from the first plurality of vectors according to a first performance metric. A second plurality of vectors is generated within a threshold distance of the selected best vector, wherein each of the second plurality of vectors represents a set of tap values for the filter at a second resolution that is superior to the first resolution. A best vector is selected from the second plurality of vectors according to a second performance metric.Type: ApplicationFiled: January 24, 2006Publication date: July 26, 2007Inventors: Kofi Anim-Appiah, Nirmal Warke
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Publication number: 20050243941Abstract: An M-dimension M-PAM trellis code encoder, a method of encoding user bits and a decoder. In one embodiment, the encoder includes: (1) a convolutional encoder portion configured to encode at least two user bits into at least three coded bits and (2) a sublattice selector coupled to the convolutional encoder portion and configured to employ the at least three coded bits to select a particular sublattice of code alphabet elements and further to employ at least two additional user bits to select a particular code alphabet element in the sublattice.Type: ApplicationFiled: April 29, 2004Publication date: November 3, 2005Applicant: Texas Instruments IncorporatedInventors: Kofi Anim-Appiah, Nirmal Warke
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Publication number: 20050089089Abstract: In one aspect, the present invention provides a system and method for selecting precursor equalizer coefficients and a serializer deserializer (SERDES) incorporating the system or the method. In one embodiment, the system includes: (1) a cost definer configured to generate an eye height cost function based on continuous-time channel and crosstalk symbol responses pertaining to a particular serial link and (2) a cost evaluator associated with the cost definer and configured to evaluate the eye height cost function based on a particular criterion thereby to produce coefficients for a precursor equalizer to be applied with respect to the particular serial link.Type: ApplicationFiled: April 28, 2004Publication date: April 28, 2005Applicant: Texas Instruments IncorporatedInventors: Kofi Anim-Appiah, Nirmal Warke, Song Wu
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Publication number: 20040029619Abstract: The present invention provides a system for providing simultaneous operation of disparate wireless telecommunication technologies within a single device (102). The device comprises a plurality of antennas (112, 114). The system provides an antenna switching function (116) communicatively coupled to the plurality of antennas. A first wireless telecommunications function (104) is communicatively coupled to the antenna switching function, as is a second wireless telecommunications function (106). The system provides an arbitration function (118) communicatively coupled to the antenna switching function and the first and second wireless telecommunications functions. A defined prioritization scheme is provided. The arbitration function operates to control access to the plurality of antennas by the first and second wireless telecommunications functions according to the defined prioritization scheme.Type: ApplicationFiled: August 5, 2003Publication date: February 12, 2004Inventors: Jie Liang, Matthew B. Shoemake, Kofi Anim-Appiah, Anuj Batra
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Publication number: 20030171115Abstract: A four channel wireless network channelization scheme is described that is particularly usable in the ISM frequency band between 2400 MHz and 2483.5 MHz. The preferred channelization scheme permits access points to be set at one of four frequencies in the ISM band, not three as taught by the IEEE 802.11b standard. This channelization scheme takes advantage of the fact that only 20 MHz is typically needed between adjacent access point channels, not 25 MHz as is taught by the 802.11b standard. With four channels to choose from, a higher density of access points can be located thereby accommodating a higher density of users. The four channels preferably are 2407, 2427, 2447 and 2467 MHz. With this selection of channel frequencies and given the current FCC regulations, all four channels can be used to transmit an equal amount of power.Type: ApplicationFiled: July 31, 2002Publication date: September 11, 2003Applicant: Texas Instruments IncorporatedInventors: Anuj Batra, Kofi Anim-Appiah, Matthew B. Shoemake