Patents by Inventor Zhangyong Ma
Zhangyong Ma 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: 9148265Abstract: A method in a sending system entity for estimating a frequency offset associated with a data transfer from a receiving system entity in a mobile communication network is disclosed. The method includes extracting user data associated with a predefined user from the transferred data and transforming the extracted user data into a time domain. The method also includes estimating a resource symbol phase offset, ?1, between two resource symbols representing the same user from the transformed user data and estimating a resource element phase offset, ?2, between two resource blocks occupied by the same user. Additionally, the method includes estimating a frequency offset based on ?1 and ?2.Type: GrantFiled: April 12, 2010Date of Patent: September 29, 2015Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventor: Zhangyong Ma
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Patent number: 8947997Abstract: The exemplary embodiments of the present invention relate to a transmission part (500), to a receiver part (600), to a transceiver comprising the transmission and receiver parts, to a radio base station comprising the transceiver, to a method in the transmission part (500) and to a method in a receiver part (600). According to the embodiments of the present invention, the transmission part (500) is configured to generate calibration sequences; process the sequences to determine a resulting calibration signal prior to transmission to a receiver part for enabling the receiver part to detect group delay of the received resulting calibration signal for calibration of the transceiver and/or of the radio base station in a wideband communications system.Type: GrantFiled: October 27, 2009Date of Patent: February 3, 2015Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Jingyi Liao, Zhangyong Ma
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Patent number: 8811551Abstract: A method for supporting wireless communication over a physical channel in a mobile broadband system includes providing an estimate of the channel and obtaining a channel autocorrelation function of a channel impulse response of the channel. The method also includes expressing the channel autocorrelation function as a zero order Bessel function and applying Taylor expansion to the zero order Bessel function. Additionally, the method includes performing derivation of the channel autocorrelation function to obtain an estimate of the maximum Doppler frequency and using the obtained estimate of the maximum Doppler frequency to compensate for a current Doppler effect in a receiver receiving the signals.Type: GrantFiled: March 11, 2010Date of Patent: August 19, 2014Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventor: Zhangyong Ma
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Publication number: 20140036860Abstract: A method in a sending system entity for estimating a frequency offset associated with a data transfer from a receiving system entity in a mobile communication network is disclosed. The method includes extracting user data associated with a predefined user from the transferred data and transforming the extracted user data into a time domain. The method also includes estimating a resource symbol phase offset, ?1, between two resource symbols representing the same user from the transformed user data and estimating a resource element phase offset, ?2, between two resource blocks occupied by the same user. Additionally, the method includes estimating a frequency offset based on ?1 and ?2.Type: ApplicationFiled: April 12, 2010Publication date: February 6, 2014Inventor: Zhangyong Ma
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Publication number: 20140010272Abstract: Certain aspects of the present disclosure relate to a technique for pilot based inter-carrier interference (ICI) cancellation in time-varying channel environments, such as wireless mobile broadband systems based on Orthogonal Frequency Division Multiplexing (OFDM).Type: ApplicationFiled: February 14, 2011Publication date: January 9, 2014Applicant: QUALCOMM IncorpatedInventors: Zhangyong Ma, Neng Wang, Haitong Sun
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Publication number: 20130003807Abstract: A method for supporting wireless communication over a physical channel in a mobile broadband system includes providing an estimate of the channel and obtaining a channel autocorrelation function of a channel impulse response of the channel. The method also includes expressing the channel autocorrelation function as a zero order Bessel function and applying Taylor expansion to the zero order Bessel function. Additionally, the method includes performing derivation of the channel autocorrelation function to obtain an estimate of the maximum Doppler frequency and using the obtained estimate of the maximum Doppler frequency to compensate for a current Doppler effect in a receiver receiving the signals.Type: ApplicationFiled: March 11, 2010Publication date: January 3, 2013Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)Inventor: Zhangyong Ma
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Patent number: 8315643Abstract: An efficient channel quality indicator channel (CQICH) transport method and system are disclosed. The CQICH transport method defines five types of CQI transport formats, to cover known cases of CQI feedback. The CQICH transport method further defines the format of transportation, which enables any of the five types of CQI transport formats to be transmitted.Type: GrantFiled: March 28, 2008Date of Patent: November 20, 2012Assignee: Intel CorporationInventors: Guangjie Li, Xiaoxin Wu, Zhangyong Ma, Yang Gao, May Wu
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Publication number: 20120250493Abstract: The exemplary embodiments of the present invention relate to a transmission part (500), to a receiver part (600), to a transceiver comprising the transmission and receiver parts, to a radio base station comprising the transceiver, to a method in the transmission part (500) and to a method in a receiver part (600). According to the embodiments of the present invention, the transmission part (500) is configured to generate calibration sequences; process the sequences to determine a resulting calibration signal prior to transmission to a receiver part for enabling the receiver part to detect group delay of the received resulting calibration signal for calibration of the transceiver and/or of the radio base station in a wideband communications system.Type: ApplicationFiled: October 27, 2009Publication date: October 4, 2012Applicants: ERICSSON (CHINA) COMMUNICATIONS CO. LTD.Inventors: Jingyi Liao, Zhangyong Ma
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Patent number: 7907677Abstract: A unified open loop single-user/multiple-user multiple-input-multiple-output (MIMO) system and method are disclosed. The system and method operate without use of channel state information feedback. Instead, the method utilizes channel quality indicator feedback to schedule users to spatial resource blocks. Both symmetric multi-user MIMO schemes (like 2×2 and 4×4) and asymmetric multi-user MIMO schemes are considered. CQI feedback and reduction proposals are also introduced. The method may be used in a proposed network topology.Type: GrantFiled: September 29, 2007Date of Patent: March 15, 2011Assignee: Intel CorporationInventors: Guangjie Li, Xiaoxin Wu, Zhangyong Ma, Yang Gao, Feng Zhou, May Wu
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Publication number: 20090041138Abstract: An efficient channel quality indicator channel (CQICH) transport method and system are disclosed. The CQICH transport method defines five types of CQI transport formats, to cover known cases of CQI feedback. The CQICH transport method further defines the format of transportation, which enables any of the five types of CQI transport formats to be transmitted.Type: ApplicationFiled: March 28, 2008Publication date: February 12, 2009Inventors: Guangjie Li, Xiaoxin Wu, Zhangyong Ma, Yang Gao, May Wu
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Publication number: 20090041148Abstract: A unified open loop single-user/multiple-user multiple-input-multiple-output (MIMO) system and method are disclosed. The system and method operate without use of channel state information feedback. Instead, the method utilizes channel quality indicator feedback to schedule users to spatial resource blocks. Both symmetric multi-user MIMO schemes (like 2×2 and 4×4) and asymmetric multi-user MIMO schemes are considered. CQI feedback and reduction proposals are also introduced. The method may be used in a proposed network topology.Type: ApplicationFiled: September 29, 2007Publication date: February 12, 2009Inventors: GUANGJIE LI, Xiaoxin Wu, Zhangyong Ma, Yang Gao, Feng Zhou, May Wu
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Patent number: 7376176Abstract: The present invention relates to a method and an apparatus for adjusting an average interval of channel estimation dynamically based on Doppler-shift. The method comprises the steps of estimating Doppler-shift by using level cross rate (LCR) according to differently moving speeds of mobile terminals, determining the optimal average interval of channel estimation based on the relationship between the existing Doppler-shift and the optimal average interval of channel estimation, dynamically adjusting the average interval of channel estimation according to the determined the optimal average interval of channel estimation to make the coherent receiver obtain the optimal estimation performance at different moving speeds.Type: GrantFiled: September 3, 2002Date of Patent: May 20, 2008Assignees: The Research Institute of Telecommunication Transmission, MII, Southeast UniversityInventors: Chunming Zhao, Zhangyong Ma, Liangcheng Jiang, Xiaohu You