Patents by Inventor Mohammad Hossein Shakiba
Mohammad Hossein Shakiba 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: 20210409245Abstract: A method and apparatus for signal equalization are provided. Multiple decision components are arranged in a sequence, beginning with a history portion and ending with a decode portion. Each decision component performs a decode decision on a symbol. Decode decisions are passed forward to other decision components where they can be used to compensate for intersymbol interference. Decode decision output by the history portion are otherwise discarded, while decode decisions output by the decode portion are output as a decoded signal. In the next decode cycle, input previously provided to the decode portion is again provided to the history portion, in a sliding, overlapping block manner.Type: ApplicationFiled: June 29, 2020Publication date: December 30, 2021Applicant: HUAWEI TECHNOLOGIES CO., LTD.Inventors: James Raymond BAILEY, Mohammad Hossein SHAKIBA
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Patent number: 11212143Abstract: A method and apparatus for signal equalization are provided. Multiple decision components are arranged in a sequence, beginning with a history portion and ending with a decode portion. Each decision component performs a decode decision on a symbol. Decode decisions are passed forward to other decision components where they can be used to compensate for intersymbol interference. Decode decision output by the history portion are otherwise discarded, while decode decisions output by the decode portion are output as a decoded signal. In the next decode cycle, input previously provided to the decode portion is again provided to the history portion, in a sliding, overlapping block manner.Type: GrantFiled: June 29, 2020Date of Patent: December 28, 2021Assignee: HUAWEI TECHNOLOGIES CO., LTD.Inventors: James Raymond Bailey, Mohammad Hossein Shakiba
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Publication number: 20190319825Abstract: Systems and methods are disclosed for detecting sequences of symbols in a received signal in the presence of inter-symbol interference. Maximum Likelihood Sequence Detection (MLSD) is a known method for optimum detection of such sequences. To reduce the complexity of the MLSD, a Reduced-State Sequence Detection (RSSD) technique has been considered based on partitioning the states of the MLSD. In this approach, a simplified sequence detector is placed within a global decision feedback loop. The disclosed architecture shortens the feedback loop by moving the sequence detector outside the loop and converting the interaction between the two to a feed-forward manner. This is achieved through slicing the signal and closing a nested loop around the sliced bins. A further variant simplifies the detector even more by reducing the number of bins.Type: ApplicationFiled: April 16, 2018Publication date: October 17, 2019Inventor: Mohammad Hossein Shakiba
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Patent number: 10425257Abstract: Systems and methods are disclosed for detecting sequences of symbols in a received signal in the presence of inter-symbol interference. Maximum Likelihood Sequence Detection (MLSD) is a known method for optimum detection of such sequences. To reduce the complexity of the MLSD, a Reduced-State Sequence Detection (RSSD) technique has been considered based on partitioning the states of the MLSD. In this approach, a simplified sequence detector is placed within a global decision feedback loop. The disclosed architecture shortens the feedback loop by moving the sequence detector outside the loop and converting the interaction between the two to a feed-forward manner. This is achieved through slicing the signal and closing a nested loop around the sliced bins. A further variant simplifies the detector even more by reducing the number of bins.Type: GrantFiled: April 16, 2018Date of Patent: September 24, 2019Assignee: HUAWEI TECHNOLOGIES CO., LTD.Inventor: Mohammad Hossein Shakiba
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Patent number: 8462759Abstract: Systems and methods are provided herein for interfacing a first multi-media digital device with a second multi-media digital device. An exemplary method includes the steps of: (i) converting a plurality of differential digital content channels from the first multi-media digital device into a plurality of single-ended digital content channels; (ii) transmitting the plurality of single-ended digital content channels from the first multi-media digital device to the second multi-media digital device via one or more coaxial cables; and (iii) receiving the single-ended digital content channels from the one or more coaxial cables and converting the single-ended digital content channels back into a plurality of differential digital content channels that are supplied to the second multi-media digital device.Type: GrantFiled: February 11, 2008Date of Patent: June 11, 2013Assignee: Semtech Canada CorporationInventors: Mohammad Hossein Shakiba, John Hudson, Jack MacDougall, Martin Rofheart, David L. Lynch
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Patent number: 8159927Abstract: Systems and methods are provided herein for interfacing a first digital device with a second digital device. An exemplary method includes the steps of combining one of a plurality of digital content channels and a back channel to form a composite channel, the back channel for transmitting information from the second multi-media digital device to the first multi-media digital device, converting a digital content channel and the composite channel from the first digital device into a plurality of single-ended digital content channels, transporting the plurality of single-ended digital content channels from the first digital device to the second digital device, and converting the single-ended digital content channels back into the digital content channel and the composite channel that are supplied to the second digital device. Cross-talk interference is reduced between the back channel and one of the plurality of digital content channels via a cross-talk cancellation filter.Type: GrantFiled: June 15, 2009Date of Patent: April 17, 2012Assignee: Gennum CorporationInventors: Mohammad Hossein Shakiba, John Hudson, Jack MacDougall, Martin Rofheart, David L. Lynch
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Patent number: 8081675Abstract: In accordance with the teachings described herein, an extended equalizer circuit is provided for equalizing a digital communication signal transmitted over a transmission medium that causes a frequency-dependent attenuation of the digital communication signal. An equalizer may be used that includes a linear equalization circuit and a non-linear equalization circuit, the linear equalization circuit being configured to apply a linear filter to the digital communication signal to compensate for the frequency-dependent attenuation caused by a first portion of the transmission medium, and the non-linear equalization circuit being configured to apply one or more non-linear operations to the digital communication signal.Type: GrantFiled: April 11, 2008Date of Patent: December 20, 2011Assignee: Gennum CorporationInventors: Mohammad Hossein Shakiba, Vasilis Papanikolaou, David L. Lynch
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Publication number: 20100043045Abstract: Systems and methods are provided herein for interfacing a first digital device with a second digital device. An exemplary method includes the steps of combining one of a plurality of digital content channels and a back channel to form a composite channel, the back channel for transmitting information from the second multi-media digital device to the first multi-media digital device, converting a digital content channel and the composite channel from the first digital device into a plurality of single-ended digital content channels, transporting the plurality of single-ended digital content channels from the first digital device to the second digital device, and converting the single-ended digital content channels back into the digital content channel and the composite channel that are supplied to the second digital device. Cross-talk interference is reduced between the back channel and one of the plurality of digital content channels via a cross-talk cancellation filter.Type: ApplicationFiled: June 15, 2009Publication date: February 18, 2010Inventors: Mohammad Hossein Shakiba, John Hudson, Jack MacDougall, Martin Rofheart, David L. Lynch
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Publication number: 20080253439Abstract: In accordance with the teachings described herein, an extended equalizer circuit is provided for equalizing a digital communication signal transmitted over a transmission medium that causes a frequency-dependent attenuation of the digital communication signal. An equalizer may be used that includes a linear equalization circuit and a non-linear equalization circuit, the linear equalization circuit being configured to apply a linear filter to the digital communication signal to compensate for the frequency-dependent attenuation caused by a first portion of the transmission medium, and the non-linear equalization circuit being configured to apply one or more non-linear operations to the digital communication signal.Type: ApplicationFiled: April 11, 2008Publication date: October 16, 2008Inventors: Mohammad Hossein Shakiba, Vasilis Papanikolaou, David L. Lynch
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Patent number: 6463108Abstract: A method and apparatus for avoiding and or recovering from the latch-up condition in a quantized feedback DC restorer circuit for use in a digital data communication system receiver. An automatic gain control (AGC) circuit controls the level of the received data by comparing the AGC output with a quantized output signal from the DC restorer. A carrier detect circuit detects the presence of data transitions in the quantized output signal, and in the absence of such transitions continuously ramps up the gain of the AGC until such transitions are detected. The carrier detect circuit can be further used to disable, either entirely or partially, the positive feedback path of the DC restorer in the absence of transition in the quantized output signal. The present invention further provides an inherent muting function of the DC restorer output signal in the absence of valid data transitions.Type: GrantFiled: March 29, 1999Date of Patent: October 8, 2002Assignee: Gennum CorporationInventor: Mohammad Hossein Shakiba
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Publication number: 20020118762Abstract: In general, a system and method for routing audio over a Digital Visual Interface (DVI) link is described herein. In one embodiment, the system comprises a a Digital Audio Interface (DAI) transmitter and a DAI receiver. Coupled to a fourth channel of the DVI link that transmits a pixel-rate clock signal, the DAI transmitter modulates the pixel-rate clock signal by input digital audio. The DAI transmitter sends the modulated clock signal to the DAI receiver. The DAI receiver recovers the digital audio from the modulated pixel-rate clock signal.Type: ApplicationFiled: May 8, 2001Publication date: August 29, 2002Inventors: Mohammad Hossein Shakiba, Sasan Nikneshan, Mehrdad Negahban
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Patent number: 6201450Abstract: A relaxation oscillator, such as a voltage controlled oscillator (VCO), with automatic swing control feedback which dynamically monitors the voltage swing across a capacitor and adjusts the oscillator threshold voltage, at which reversal of the polarity of the charging/discharging current occurs, to maintain the effective voltage swing at a constant level. The improved relaxation oscillator provides a very wide linear range of frequency variation versus control voltage (or current) and allows for the extendibility of linear operation to or near the maximum frequency that can be practically achieved by the oscillator circuitry.Type: GrantFiled: September 22, 1999Date of Patent: March 13, 2001Assignee: Gennum CorporationInventors: Mohammad Hossein Shakiba, Tirdad Sowlati Hashjani
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Patent number: RE40038Abstract: A method and apparatus for avoiding and or recovering from the latch-up condition in a quantized feedback DC restorer circuit for use in a digital data communication system receiver. An automatic gain control (AGC) circuit controls the level of the received data by comparing the AGC output with a quantized output signal from the DC restorer. A carrier detect circuit detects the presence of data transitions in the quantized output signal, and in the absence of such transitions continuously ramps up the gain of the AGC until such transitions are detected. The carrier detect circuit can be further used to disable, either entirely or partially, the positive feedback path of the DC restorer in the absence of transition in the quantized output signal. The present invention further provides an inherent muting function of the DC restorer output signal in the absence of valid data transitions.Type: GrantFiled: October 7, 2004Date of Patent: January 29, 2008Assignee: Gennum CorporationInventor: Mohammad Hossein Shakiba