Patents by Inventor Kazuhiko Matsuno
Kazuhiko Matsuno 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: 7848345Abstract: A communication network which can use communication bandwidth effectively. Spreading codes of a first and a second code length are assigned for every communication terminal interfaces connected to the same communication network. The spreading codes of the first code length are used for data communications. The spreading codes of the second code length are used for the control communications between the interfaces and the server. The interfaces and the server receives mixed signals of the data and the control signals. When the received signals are decoded using the spreading code of the first code length, control signal components became equal to or lower than the noise level. When the received signals are decoded using the spreading code of the second code length, data components became equal to or lower than the noise level. Therefore, the interfaces and the server can extract one of these signal components.Type: GrantFiled: June 9, 2009Date of Patent: December 7, 2010Assignee: Oki Electric Industry Co., Ltd.Inventors: Masayuki Kashima, Kazuhiko Matsuno
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Publication number: 20090252496Abstract: A communication network which can use communication bandwidth effectively. Spreading codes of a first and a second code length are assigned for every communication terminal interfaces connected to the same communication network. The spreading codes of the first code length are used for data communications. The spreading codes of the second code length are used for the control communications between the interfaces and the sever. The interfaces and the server receives mixed signals of the data and the control signals. When the received signals are decoded using the spreading code of the first code length, control signal components became equal to or lower than the noise level. When the received signals are decoded using the spreading code of the second code length, data components became equal to or lower than the noise level. Therefore, the interfaces and the server can extract one of these signal components.Type: ApplicationFiled: June 9, 2009Publication date: October 8, 2009Applicant: Oki Electric Industry Co., Ltd.Inventors: MASAYUKI KASHIMA, Kazuhiko Matsuno
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Patent number: 7564774Abstract: A communication network which can use communication bandwidth effectively. Spreading codes of a first and a second code length are assigned for every communication terminal interfaces connected to the same communication network. The spreading codes of the first code length are used for data communications. The spreading codes of the second code length are used for the control communications between the interfaces and the sever. The interfaces and the server receives mixed signals of the data and the control signals. When the received signals are decoded using the spreading code of the first code length, control signal components became equal to or lower than the noise level. When the received signals are decoded using the spreading code of the second code length, data components became equal to or lower than the noise level. Therefore, the interfaces and the server can extract one of these signal components.Type: GrantFiled: August 30, 2004Date of Patent: July 21, 2009Assignee: Oki Electric Industry Co., Ltd.Inventors: Masayuki Kashima, Kazuhiko Matsuno
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Patent number: 7535951Abstract: A code division multiplexing communication system which transmits a single signal array in use of band for two channels. A first data generator generates a channel signal array. A data distributor branches the channel signal array into two. A first spread modulator converts one of the branch signal array to a signal array having values VL and VH by performing spread modulation in use of a predetermined spread code. A second spread modulator converts the other branch signal array to a signal array having signal values VL, VH and high impedance and then performs spread modulation in use of the same spread code as the first spread modulator. The outputs of the first and the second spread modulator are superimposed by an adder. Accordingly, a quaternary signal array using band for two channels can be generated.Type: GrantFiled: December 19, 2005Date of Patent: May 19, 2009Assignee: Oki Electric Industry Co., Ltd.Inventors: Kazuhiko Matsuno, Masayuki Kashima
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Patent number: 7342909Abstract: According to a CDMA communication system for the present invention, the transmission side for each channel increases the amplitude of a time slot period for self-channel synchronization until greater than the amplitude for another period, and outputs the resultant signal as a modulation signal. The reception side obtains a correlation between a multiplex signal obtained by superimposing modulation signals for multiple channels, and a spreading code allocated for the self-channel. Since the amplitude of the time slot period for the self-channel synchronization is increased by the transmission side, the large value portion indicating the synchronization timing is included in the correlation signal, and by detecting this value, the reception side can easily obtain the synchronization timing.Type: GrantFiled: August 19, 2003Date of Patent: March 11, 2008Assignee: Oki Electric Industry Co., Ltd.Inventors: Kazuhiko Matsuno, Masayuki Kashima
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Patent number: 7324753Abstract: The present invention is a high-speed and low-cost optical communication network. A preferred embodiment of this optical communication network comprises an accommodation device, optical couplers that are connected to corresponding ports of this accommodation device, and communication terminals that are connected to corresponding optical couplers. Further, data transmitted by the communication terminals to the accommodation device is code-division multiplexed. Because data collision is prevented by means of code division multiplexing, control of the timing with which the communication terminals transmit data is not required. Meanwhile, data transmitted by the accommodation device to the communication terminals is time-division multiplexed because there is no risk of collision.Type: GrantFiled: January 8, 2004Date of Patent: January 29, 2008Assignee: Oki Electric Industry Co., Ltd.Inventors: Masayuki Kashima, Kazuhiko Matsuno
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Patent number: 7180961Abstract: The receiving device of the invention contains a correlational operation unit that executes a correlational operation between a first modulated signal having a spread-spectrum modulation applied and a first spread-spectrum signal string to output a correlational signal, and a decision circuit that decides an amplitude value of the correlational signal to output a decision signal. The decision circuit is composed of: a first detector that outputs a first detection signal when it detects that a value of the first correlational signal exceeds the first threshold, a second detector that outputs a second detection signal when it detects that the value of the first correlational signal exceeds the second threshold, and a detected signal selector that outputs the decision signal of a first value when the first detection signal is inputted, and outputs the decision signal of a second value when the second detection signal is inputted.Type: GrantFiled: February 21, 2003Date of Patent: February 20, 2007Assignee: Oki Electric Industry Co., Ltd.Inventors: Kazuhiko Matsuno, Masayuki Kashima
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Publication number: 20060146778Abstract: A code division multiplexing communication system which transmits a single signal array in use of band for two channels. A first data generator generates a channel signal array. A data distributor branches the channel signal array into two. A first spread modulator converts one of the branch signal array to a signal array having values VL and VH by performing spread modulation in use of a predetermined spread code. A second spread modulator converts the other branch signal array to a signal array having signal values VL, VH and high impedance and then performs spread modulation in use of the same spread code as the first spread modulator. The outputs of the first and the second spread modulator are piled by an adder. Accordingly, a quaternary signal array using band for two channels can be generated.Type: ApplicationFiled: December 19, 2005Publication date: July 6, 2006Applicant: Oki Electric Industry Co., Ltd.Inventors: Kazuhiko Matsuno, Masayuki Kashima
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Publication number: 20050047427Abstract: A communication network which can use communication bandwidth effectively. Spreading codes of a first and a second code length are assigned for every communication terminal interfaces connected to the same communication network. The spreading codes of the first code length are used for data communications. The spreading codes of the second code length are used for the control communications between the interfaces and the sever. The interfaces and the server receives mixed signals of the data and the control signals. When the received signals are decoded using the spreading code of the first code length, control signal components became equal to or lower than the noise level. When the received signals are decoded using the spreading code of the second code length, data components became equal to or lower than the noise level. Therefore, the interfaces and the server can extract one of these signal components.Type: ApplicationFiled: August 30, 2004Publication date: March 3, 2005Applicant: Oki Electric Industry Co., Ld.Inventors: Masayuki Kashima, Kazuhiko Matsuno
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Publication number: 20040141499Abstract: The present invention is a high-speed and low-cost optical communication network. A preferred embodiment of this optical communication network comprises an accommodation device, optical couplers that are connected to corresponding ports of this accommodation device, and communication terminals that are connected to corresponding optical couplers. Further, data transmitted by the communication terminals to the accommodation device is code-division multiplexed. Because data collision is prevented by means of code division multiplexing, control of the timing with which the communication terminals transmit data is not required. Meanwhile, data transmitted by the accommodation device to the communication terminals is time-division multiplexed because there is no risk of collision.Type: ApplicationFiled: January 8, 2004Publication date: July 22, 2004Applicant: Oki Electric Industry Co., Ltd.Inventors: Masayuki Kashima, Kazuhiko Matsuno
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Publication number: 20040047330Abstract: According to a CDMA communication system for the present invention, the transmission side for each channel increases the amplitude of a time slot period for self-channel synchronization until greater than the amplitude for another period, and outputs the resultant signal as a modulation signal. The reception side obtains a correlation between a multiplex signal obtained by superimposing modulation signals for multiple channels, and a spreading code allocated for the self-channel. Since the amplitude of the time slot period for the self-channel synchronization is increased by the transmission side, the large value portion indicating the synchronization timing is included in the correlation signal, and by detecting this value, the reception side can easily obtain the synchronization timing.Type: ApplicationFiled: August 19, 2003Publication date: March 11, 2004Applicant: Oki Electric Industry Co., Ltd.Inventors: Kazuhiko Matsuno, Masayuki Kashima
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Publication number: 20030161389Abstract: The receiving device of the invention contains a correlational operation unit that executes a correlational operation between a first modulated signal having a spread-spectrum modulation applied and a first spread-spectrum signal string to output a correlational signal, and a decision circuit that decides an amplitude value of the correlational signal to output a decision signal. The decision circuit is composed of: a first detector that outputs a first detection signal when it detects that a value of the first correlational signal exceeds the first threshold, a second detector that outputs a second detection signal when it detects that the value of the first correlational signal exceeds the second threshold, and a detected signal selector that outputs the decision signal of a first value when the first detection signal is inputted, and outputs the decision signal of a second value when the second detection signal is inputted.Type: ApplicationFiled: February 21, 2003Publication date: August 28, 2003Inventors: Kazuhiko Matsuno, Masayuki Kashima