Patents by Inventor Hui Shi
Hui Shi 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: 7525939Abstract: A communication node relays a transmission signal transmitted from a desired source node to a target destination node among multiple source nodes and multiple destination nodes. The communication node includes a first unitary matrix estimation unit that estimates a first unitary matrix by performing singular value decomposition involving one or more channel matrices between the relay node and the source nodes other than the desired source node; a second unitary matrix estimation unit that estimates a second unitary matrix by performing singular value decomposition involving one or more channel matrices between the relay node and the destination nodes other than the target destination node; and a transmission unit configured to transmit a relaying signal generated by multiplying a received signal by the first and second unitary matrices toward the target destination node.Type: GrantFiled: August 30, 2005Date of Patent: April 28, 2009Assignee: NTT DoCoMo, Inc.Inventors: Tetsushi Abe, Hui Shi, Takahiro Asai, Hitoshi Yoshino
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Publication number: 20080049658Abstract: To improve the channel capacity of an entire communication system in accordance with transmission quality of the channels of each node. A relay node has: a receiving section that receives a received signal from a source node; a channel estimation section that measures SNR of a backward channel between the source node and the relay node, and SNR of a forward channel between the relay node and a destination node; a relay selecting section that selects, from among a QR-P-ZF method, a QR-P-QR method and a ZF-P-QR method, a relay method of the relay node in accordance with the ratio between the SNRs of the backward and forward channels; a relay signal processing section that multiplies the received signal by a transmission weight matrix corresponding to the selected relay method, and thereby converts the received signal to a relay signal; and a transmitting section that transmits the relay signal to the destination node.Type: ApplicationFiled: August 24, 2007Publication date: February 28, 2008Applicant: NTT DoCoMo, Inc.Inventors: Takahiro Asai, Hitoshi Yoshino, Hui Shi
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Publication number: 20070274372Abstract: A radio communication apparatus for performing transmission and reception of radio communications simultaneously by using different carrier frequencies for transmission and reception, comprising: a transceiver having a coupling loop interference signal removal function for analog domain and/or a coupling loop interference signal removal function for digital domain, for removing a coupling loop interference signal contained in a signal; and a power suppressor for coupling loop interference signal for attenuating the signal power in order to suppress the coupling loop interference signal power that is contained in the signal.Type: ApplicationFiled: May 23, 2007Publication date: November 29, 2007Applicants: Tokyo Institute of Technology, NTT DoCoMo, Inc.Inventors: Takahiro Asai, Hui Shi, Hitoshi Yoshino, Satoshi Suyama, Kazuhiko Fukawa, Hiroshi Suzuki
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Publication number: 20070230547Abstract: A radio communication apparatus for performing transmission and reception based on radio communication includes: a power suppressor for coupling loop interference signal for attenuating signal power of a received signal to suppress the coupling loop interference signal power of the received signal; and a transceiver having a coupling loop interference signal removal function for analog domain and/or a coupling loop interference signal removal function for digital domain, for removing a coupling loop interference signal contained in a signal output from the power suppressor for coupling loop interference signal.Type: ApplicationFiled: March 30, 2007Publication date: October 4, 2007Applicants: Tokyo Institute of Technology, NTT DoCoMo, Inc.Inventors: Takahiro ASAI, Hui Shi, Hiromasa Fujii, Takefumi Yamada, Hitoshi Yoshino, Hiroshi Suzuki, Kazuhiko Fukawa, Satoshi Suyama
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Publication number: 20070129008Abstract: A communication node for relaying a signal between a source node and a destination node is disclosed. The communication node includes: a relay signal generation unit configured to generate a transmit signal by reducing, from a receive signal, an interference signal from another communication node and performing a process such that the transmit signal is not received as an interference signal by another communication node.Type: ApplicationFiled: December 1, 2006Publication date: June 7, 2007Applicant: NTT DoCoMo, Inc.Inventors: Hui SHI, Takahiro Asai, Hitoshi Yoshino
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Patent number: 7126987Abstract: A transmitting device to send an input signal in a channel includes an equalization system. The equalization system includes a decision subsystem to determine when adjustments need to be made based on the frequency of 0s or 1s in the input signal. The equalization system also includes an equalization subsystem to determine, by default, or by user choice, a compensation for a channel's amplitude variation due to frequency response, and to apply the compensation to the input signal and generate an equalized output signal.Type: GrantFiled: September 6, 2005Date of Patent: October 24, 2006Assignee: Intel CorporationInventors: Hui Shi, Robert X. Jin
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Publication number: 20060056338Abstract: A communication node relays a transmission signal transmitted from a desired source node to a target destination node among multiple source nodes and multiple destination nodes. The communication node includes a first unitary matrix estimation unit that estimates a first unitary matrix by performing singular value decomposition involving one or more channel matrices between the relay node and the source nodes other than the desired source node; a second unitary matrix estimation unit that estimates a second unitary matrix by performing singular value decomposition involving one or more channel matrices between the relay node and the destination nodes other than the target destination node; and a transmission unit configured to transmit a relaying signal generated by multiplying a received signal by the first and second unitary matrices toward the target destination node.Type: ApplicationFiled: August 30, 2005Publication date: March 16, 2006Applicant: NTT DoCoMo, Inc.Inventors: Tetsushi Abe, Hui Shi, Takahiro Asai, Hitoshi Yoshino
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Publication number: 20060050655Abstract: A communication node that relays signals between a source node and a destination node includes (a) a first unitary matrix calculation unit configured to calculate a first unitary matrix based on a first channel between the source node and the relay node, (b) a second unitary matrix calculation unit configured to calculate a second unitary matrix based on a second channel between the relay node and the destination node, (c) a transformation matrix estimation unit configured to estimate a transformation matrix based on a triangular matrix derived from QR decomposition of the first and/or second channel matrix, (d) a relaying signal generator configured to generates a relaying signal by multiplying a received signal by at least one of the first unitary matrix, the second unitary matrix, and the transformation matrix, and (e) a transmission unit configured to transmit the relaying signal to the destination node.Type: ApplicationFiled: August 30, 2005Publication date: March 9, 2006Applicant: NTT DoCoMo, Inc.Inventors: Hui Shi, Tetsushi Abe, Takahiro Asai, Hitoshi Yoshino
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Publication number: 20060050811Abstract: A shared frequency transmitter for use in a network environment where transmitters and receivers of plural radio communication systems in which the same frequency is used exist is disclosed. The shared frequency transmitter includes (a) a communicating unit configured to detect peripheral transmitters existing in a peripheral area, and to exchange information with the detected peripheral transmitters; and (b) a signal generating unit configured to generate a transmit signal by applying an interference cancellation technique based on the information obtained through the exchange of information.Type: ApplicationFiled: August 31, 2005Publication date: March 9, 2006Applicant: NTT DoCoMo, IncInventors: Tetsushi Abe, Hui Shi, Takahiro Asai, Hitoshi Yoshino
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Publication number: 20060007996Abstract: A transmitting device to send an input signal in a channel includes an equalization system. The equalization system includes a decision subsystem to determine when adjustments need to be made based on the frequency of 0s or 1s in the input signal. The equalization system also includes an equalization subsystem to determine, by default, or by user choice, a compensation for a channel's amplitude variation due to frequency response, and to apply the compensation to the input signal and generate an equalized output signal.Type: ApplicationFiled: September 6, 2005Publication date: January 12, 2006Applicant: INTEL CORPORATIONInventors: Hui Shi, Robert Jin
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Patent number: 6975675Abstract: A transmitting device to send an input signal in a channel includes an equalization system. The equalization system includes a decision subsystem to determine when adjustments need to be made based on the frequency of 0s or 1s in the input signal. The equalization system also includes an equalization subsystem to determine, by default, or by user choice, a compensation for a channel's amplitude variation due to frequency response, and to apply the compensation to the input signal and generate an equalized output signal.Type: GrantFiled: February 12, 2002Date of Patent: December 13, 2005Assignee: Intel CorporationInventors: Hui Shi, Robert X. Jin
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Patent number: 6771194Abstract: A system and method are used to convert a parallel datastream to a serial datastream. N number of parallel bits are input to n number of selection devices. One of the n number of selection devices is selected as an active selection device. The active selection device is directly coupled to a corresponding current source. The (n−1) inactive selection devices are coupled to a current steering device. The current steering device is coupled to the corresponding (n−1) inactive selection devices. The current steering device allow taking over by input data bit or latch on the previous bit if there is no input. The parallel bit is converted to a bit in the serial datastream by generating a voltage representative of a value of the serial bit utilizing a combined current from the n current sources.Type: GrantFiled: July 9, 2003Date of Patent: August 3, 2004Assignee: Intel CorporationInventor: Hui Shi
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Publication number: 20040104829Abstract: A system and method are used to convert a parallel datastream to a serial datastream. N number of parallel bits are input to n number of selection devices. One of the n number of selection devices is selected as an active selection device. The active selection device is directly coupled to a corresponding current source. The (n−1) inactive selection devices are coupled to a current steering device. The current steering device is coupled to the corresponding (n−1) inactive selection devices. The current steering devices allow taking over by input data bit or latch on the previous bit if there is no input. The parallel bit is converted to a bit in the serial datastream by generating a voltage representative of a value of the serial bit utilizing a combined current from the n current sources.Type: ApplicationFiled: July 9, 2003Publication date: June 3, 2004Applicant: INTEL CORPORATIONInventor: Hui Shi
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Patent number: 6614372Abstract: A system and method are used to convert a parallel datastream to a serial datastream. N number of parallel bits are input to n number of selection devices. One of the n number of selection devices is selected as an active selection device. The active selection device is directly coupled to a corresponding current source. The (n−1) inactive selection devices are coupled to a current steering device. The current steering device is coupled to the corresponding (n−1) inactive selection devices. The current steering devices allow taking over by input data bit or latch on the previous bit if there is no input. The parallel bit is converted to a bit in the serial datastream by generating a voltage representative of a value of the serial bit utilizing a combined current from the n current sources.Type: GrantFiled: February 12, 2002Date of Patent: September 2, 2003Assignee: Intel CorporationInventor: Hui Shi
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Publication number: 20030161394Abstract: A transmitting device to send an input signal in a channel includes an equalization system. The equalization system includes a decision subsystem to determine when adjustments need to be made based on the frequency of 0s or 1s in the input signal. The equalization system also includes an equalization subsystem to determine, by default, or by user choice, a compensation for a channel's amplitude variation due to frequency response, and to apply the compensation to the input signal and generate an equalized output signal.Type: ApplicationFiled: February 12, 2002Publication date: August 28, 2003Inventors: Hui Shi, Robert Jin
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Publication number: 20030151530Abstract: A system and method are used to convert a parallel datastream to a serial datastream. N number of parallel bits are input to n number of selection devices. One of the n number of selection devices is selected as an active selection device. The active selection device is directly coupled to a corresponding current source. The (n−1) inactive selection devices are coupled to a current steering device. The current steering device is coupled to the corresponding (n−1) inactive selection devices. The current steering devices allow taking over by input data bit or latch on the previous bit if there is no input. The parallel bit is converted to a bit in the serial datastream by generating a voltage representative of a value of the serial bit utilizing a combined current from the n current sources.Type: ApplicationFiled: February 12, 2002Publication date: August 14, 2003Inventor: Hui Shi