Patents by Inventor Zigang Yang
Zigang Yang 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: 10205617Abstract: For crest factor reduction in a first signal having first and second components, the first component is delayed. A second signal is generated in response to detecting that a peak in the first component exceeds a predetermined threshold. Amplitude of the peak in the first component is reduced in response to detecting that the peak in the first component exceeds the predetermined threshold. Reducing amplitude of the peak in the first component includes adding the second signal to the delayed first component.Type: GrantFiled: July 24, 2013Date of Patent: February 12, 2019Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Lei Ding, Rahmi Hezar, Zigang Yang
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Patent number: 10015028Abstract: A system and method for reducing peak to average power ratio in a wireless communication system. A wireless communication system includes a radio frequency wireless transmitter that includes signal peak reduction circuitry configured to reduce peak to average power ratio of a signal to be transmitted by reducing amplitude of the signal to be transmitted that is greater than a predetermined amplitude. The signal peak reduction circuitry includes a bit inverter configured to invert a bit of a symbol identified as causing the amplitude of the signal to exceed the predetermined amplitude. The bit inverter is also configured to select the bit to invert such that inversion of the bit reduces the amplitude of the signal, and such that forward error correction in a receiver wirelessly coupled to the transmitter restores the bit to a pre-inversion value.Type: GrantFiled: September 22, 2014Date of Patent: July 3, 2018Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Lars Jorgensen, Zigang Yang, Hardik Prakash Gandhi
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Patent number: 9374112Abstract: A digital pre-distortion component includes: a first capturing component that captures a first sample set of data; a first generating component that generates a first change matrix associated with a portion of the first sample set of data; a first memory component that stores the first change matrix; a second capturing component that captures a second sample set of data; a second generating component that generates a second change matrix associated with a portion of the second sample set of data; a second memory component that stores the second change matrix; a third capturing component that captures a third sample set of data; a third generating component that generates a third change matrix associated with a portion of the third sample set of data; a comparing component that compares the third change matrix with the first change matrix to obtain a first comparison, and compares the third change matrix with the second change matrix to obtain a second comparison; and an adapting component that adapts the digiType: GrantFiled: September 2, 2014Date of Patent: June 21, 2016Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Zigang Yang, Raul Blazquez, Hardik Prakash Gandhi, Xiaohan Chen, Lars Jorgensen
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Publication number: 20160065249Abstract: A digital pre-distortion component includes: a first capturing component that captures a first sample set of data; a first generating component that generates a first change matrix associated with a portion of the first sample set of data; a first memory component that stores the first change matrix; a second capturing component that captures a second sample set of data; a second generating component that generates a second change matrix associated with a portion of the second sample set of data; a second memory component that stores the second change matrix; a third capturing component that captures a third sample set of data; a third generating component that generates a third change matrix associated with a portion of the third sample set of data; a comparing component that compares the third change matrix with the first change matrix to obtain a first comparison, and compares the third change matrix with the second change matrix to obtain a second comparison; and an adapting component that adapts the digiType: ApplicationFiled: September 2, 2014Publication date: March 3, 2016Inventors: Zigang Yang, Raul Blazquez, Hardik Prakash Gandhi, Xiaohan Chen, Lars Jorgensen
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Patent number: 9136887Abstract: Example embodiment of the systems and methods of linear impairment modeling to improve digital pre-distortion adaptation performance includes a DPD module that is modified during each sample by a DPD adaptation engine. A linear impairment modeling module separates the linear and non-linear errors introduced in the power amplifier. The linear impairment model is adjusted during each sample using inputs from the input signal and from a FB post processing module. The linear impairment modeling module removes the linear errors such that the DPD adaptation engine only adapts the DPD module based on the non-linear errors. This increases system stability and allows for the correction of IQ imbalance inside the linear impairment modeling, simplifying the feedback post-processing.Type: GrantFiled: February 20, 2014Date of Patent: September 15, 2015Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Hongzhi Zhao, Xiaohan Chen, Zigang Yang
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Patent number: 9124324Abstract: A method of predistorting an input signal (902) for an amplifier is disclosed (FIG. 9). The method includes predistorting the input signal with a first set of parameters (FDPD) and a second set of parameters (CDPD) at a first time (904). The first set of parameters is updated at a second time (914). The second set of parameters is updated separately from the first set of parameters at a third time (920).Type: GrantFiled: April 6, 2015Date of Patent: September 1, 2015Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Hardik Prakash Gandhi, Zigang Yang, Xiaohan Chen, Raul Blazquez, Lars Jorgensen, Hongzhi Zhao, Jie Yang
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Publication number: 20150236730Abstract: Example embodiment of the systems and methods of linear impairment modeling to improve digital pre-distortion adaptation performance includes a DPD module that is modified during each sample by a DPD adaptation engine. A linear impairment modeling module separates the linear and non-linear errors introduced in the power amplifier. The linear impairment model is adjusted during each sample using inputs from the input signal and from a FB post processing module. The linear impairment modeling module removes the linear errors such that the DPD adaptation engine only adapts the DPD module based on the non-linear errors. This increases system stability and allows for the correction of IQ imbalance inside the linear impairment modeling, simplifying the feedback post-processing.Type: ApplicationFiled: February 20, 2014Publication date: August 20, 2015Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Hongzhi Zhao, Xiaohan Chen, Zigang Yang
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Publication number: 20150214988Abstract: A method of predistorting an input signal (902) for an amplifier is disclosed (FIG. 9). The method includes predistorting the input signal with a first set of parameters (FDPD) and a second set of parameters (CDPD) at a first time (904). The first set of parameters is updated at a second time (914). The second set of parameters is updated separately from the first set of parameters at a third time (920).Type: ApplicationFiled: April 6, 2015Publication date: July 30, 2015Inventors: Hardik Prakash Gandhi, Zigang Yang, Xiaohan Chen, Raul Blazquez, Lars Jorgensen, Hongzhi Zhao, Jie Yang
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Patent number: 9001928Abstract: A method of predistorting an input signal (902) for an amplifier is disclosed (FIG. 9). The method includes predistorting the input signal with a first set of parameters (FDPD) and a second set of parameters (CDPD) at a first time (904). The first set of parameters is updated at a second time (914). The second set of parameters is updated separately from the first set of parameters at a third time (920).Type: GrantFiled: March 28, 2013Date of Patent: April 7, 2015Assignee: Texas Instruments IncorporatedInventors: Hardik Prakash Gandhi, Zigang Yang, Xiaohan Chen, Raul Blazquez, Lars Jorgensen, Hongzhi Zhao, Jie Yang
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Publication number: 20150085748Abstract: A system and method for reducing peak to average power ratio in a wireless communication system. A wireless communication system includes a radio frequency wireless transmitter that includes signal peak reduction circuitry configured to reduce peak to average power ratio of a signal to be transmitted by reducing amplitude of the signal to be transmitted that is greater than a predetermined amplitude. The signal peak reduction circuitry includes a bit inverter configured to invert a bit of a symbol identified as causing the amplitude of the signal to exceed the predetermined amplitude. The bit inverter is also configured to select the bit to invert such that inversion of the bit reduces the amplitude of the signal, and such that forward error correction in a receiver wirelessly coupled to the transmitter restores the bit to a pre-inversion value.Type: ApplicationFiled: September 22, 2014Publication date: March 26, 2015Inventors: Lars Jorgensen, Zigang Yang, Hardik Prakash Gandhi
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Patent number: 8971464Abstract: A method to form a CFR cancellation filter for signals with dynamic power and frequency distribution by estimating the filter at the rate required by the input signal's dynamics. For mixed mode systems (for example CDMA and LTE) the CFR is computed for each stream, and combined to form the final filter.Type: GrantFiled: November 21, 2012Date of Patent: March 3, 2015Assignee: Texas Instruments IncorporatedInventors: Hardik Prakash Gandhi, Zigang Yang, Lars Jorgensen, Prasad Chivakula
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Publication number: 20150030099Abstract: For crest factor reduction in a first signal having first and second components, the first component is delayed. A second signal is generated in response to detecting that a peak in the first component exceeds a predetermined threshold. Amplitude of the peak in the first component is reduced in response to detecting that the peak in the first component exceeds the predetermined threshold. Reducing amplitude of the peak in the first component includes adding the second signal to the delayed first component.Type: ApplicationFiled: July 24, 2013Publication date: January 29, 2015Applicant: Texas Instruments IncorporatedInventors: Lei Ding, Rahmi Hezar, Zigang Yang
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Patent number: 8891675Abstract: This invention is a method of power amplifier digital pre-distortion which measures a current power level of the power amplifier, stores in a look up table entries consisting of a power level and a corresponding set of digital pre-distortion coefficients, selects a set of digital pre-distortion coefficients corresponding to the measured power level. If the measured current power level is near a power level index, the digital pre-distortion coefficients correspond to the power level index. If the measured current power level is greater than the maximum power level entry, the digital pre-distortion coefficients is of the maximum power level entry. If the measured current power level is less than the minimum power level entry, the digital pre-distortion is of the minimum power level entry. If the measured current power level is not near a power level index, the digital pre-distortion coefficients are an interpolation.Type: GrantFiled: October 4, 2012Date of Patent: November 18, 2014Assignee: Texas Instruments IncorporatedInventors: Jie Yang, Zigang Yang, Hardik Prakash Gandhi, Lars Jorgensen
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Publication number: 20140294120Abstract: A method of predistorting an input signal (902) for an amplifier is disclosed (FIG. 9). The method includes predistorting the input signal with a first set of parameters (FDPD) and a second set of parameters (CDPD) at a first time (904). The first set of parameters is updated at a second time (914). The second set of parameters is updated separately from the first set of parameters at a third time (920).Type: ApplicationFiled: March 28, 2013Publication date: October 2, 2014Applicant: Texas Intsruments IncorporatedInventors: Hardik Prakash Gandhi, Zigang Yang, Xiaohan Chen, Raul Blazquez, Lars Jorgensen, Hongzhi Zhao, Jie Yang
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Publication number: 20140169496Abstract: Systems and methods for crest factor reduction (CFR) are described. A multi-band CFR architecture achieves significant hardware savings without sacrificing CFR performance by applying peak cancellation to each band individually. However, peak detection is calculated based on a combined input signal.Type: ApplicationFiled: December 17, 2013Publication date: June 19, 2014Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Zigang Yang, Lars Jorgensen, Hardik Gandhi, Lei Ding
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Patent number: 8750410Abstract: Traditionally, for multi-band communication systems, independent signal chains for each of the different bands are employed. By using such an architecture, there are a large number of components, and there is substantial power consumption. Here, transmit processor is provided that enables transmission across multiple bands using few components (namely, fewer signal chains), while also provided for digital predistortion.Type: GrantFiled: September 22, 2010Date of Patent: June 10, 2014Assignee: Texas Instruments IncorporatedInventors: Hardik P. Gandhi, Lei Ding, Zigang Yang
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Publication number: 20140140452Abstract: A method to form a CFR cancellation filter for signals with dynamic power and frequency distribution by estimating the filter at the rate required by the input signal's dynamics. For mixed mode systems (for example CDMA and LTE) the CFR is computed for each stream, and combined to form the final filter.Type: ApplicationFiled: November 21, 2012Publication date: May 22, 2014Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Hardik Prakash Gandhi, Zigang Yang, Lars Jorgensen, Prasad Chivakula
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Patent number: 8588353Abstract: In conventional radio frequency (RF) systems, transmitters will usually convert baseband signals to RF so as to be transmitted. As part of the conversion process, the transmitters will perform digital predistortion (DPD), which uses feedback from a power amplifier. However, there are usually mismatches between the in-phase (I) and quadrature (Q) paths within with feedback loop. Traditional IQ correction filters were ineffective at providing adequate compensation for these mismatches, but here a filter is provided that provides adequate out-of-band compensation by use of frequency selectivity.Type: GrantFiled: April 1, 2011Date of Patent: November 19, 2013Assignee: Texas Instruments IncorporatedInventors: Zigang Yang, Lars Jorgensen, Lei Ding
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Patent number: 8416893Abstract: Crest factor reduction algorithms described herein may be used to improve power amplifier efficiency during low signal power conditions compared to traditional static threshold techniques. Techniques described herein insure that the signal power level at the output of the crest fact reduction block is held constant relative to the input power level under all signal power level conditions. Two different solutions may be implemented together or separately to achieve the desired conditions. The first technique provides constant ratio between input power and output power. Constant ratio of peak and average output levels keeps the amount of crest factor reduction applied to the signal constant, irrespective of the signal power level. A second technique is to hold signal power level constant in respect to the amount of crest factor reduction applied.Type: GrantFiled: November 30, 2010Date of Patent: April 9, 2013Assignee: Texas Instruments IncorporatedInventors: Hardik Prakash Gandhi, Zigang Yang
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Patent number: 8351542Abstract: An apparatus and system are provided for crest factor reduction (CFR). Preferably, a peak from the wideband signal is detected. A gain from the magnitude of the peak and a threshold can then be calculated. Based on this information, each carrier's contribution to the peak can be approximated, and a cancellation pulse coefficient for each carrier from its contribution to the peak can be calculated. A base cancellation pulse can be calculated from the cancellation pulse coefficients for each carrier, and a cancellation pulse can be calculated from the base cancellation pulse and the gain, which can then be applied to the wideband signal.Type: GrantFiled: March 30, 2009Date of Patent: January 8, 2013Assignee: Texas Instruments IncorporatedInventors: Zigang Yang, Fernando A. Mujica, Gregory Copeland, Murtaza Ali