Patents by Inventor Tesshin Shiga
Tesshin Shiga 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: 7916699Abstract: In CDMA communications, a base station detects a difference between a reference phase of a spreading code and a phase of a received signal of each terminal station, and feeds a phase jump signal PJ-i representative of the phase difference back to each terminal station. After timing acquisition, the reception operation is performed using the reference phase, and a shift amount between the phase of a received signal and the reference phase is fed back to each terminal station as phase synchronization control information PC-i. Each terminal station coarsely adjusts the phase of the spreading code in accordance with the phase jump signal PJ-i, and thereafter finely adjusts the phase of its transmitting signal in accordance with the phase synchronization control information PC-i. It is therefore possible to synchronize the phases of the signals transmitted from terminal stations and received at the base station. Accordingly, an orthogonal code is used for spreading on the reverse links.Type: GrantFiled: June 8, 2009Date of Patent: March 29, 2011Assignee: Hitachi, Ltd.Inventors: Masayuki Ariyoshi, Nobukazu Doi, Tesshin Shiga, Yoshito Ohta
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Publication number: 20090245210Abstract: In CDMA communications, a base station detects a difference between a reference phase of a spreading code and a phase of a received signal of each terminal station, and feeds a phase jump signal PJ-i representative of the phase difference back to each terminal station. After timing acquisition, the reception operation is performed using the reference phase, and a shift amount between the phase of a received signal and the reference phase is fed back to each terminal station as phase synchronization control information PC-i. Each terminal station coarsely adjusts the phase of the spreading code in accordance with the phase jump signal PJ-i, and thereafter finely adjusts the phase of its transmitting signal in accordance with the phase synchronization control information PC-i. It is therefore possible to synchronize the phases of the signals transmitted from terminal stations and received at the base station. Accordingly, an orthogonal code is used for spreading on the reverse links.Type: ApplicationFiled: June 8, 2009Publication date: October 1, 2009Applicant: HITACHI COMMUNICATION TECHNOLOGIES, LTD.Inventors: Masayuki ARIYOSHI, Nobukazu DOI, Tesshin SHIGA, Yoshito OHTA
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Patent number: 7545777Abstract: In CDMA communications, a base station detects a difference between a reference phase of a spreading code and a phase of a received signal of each terminal station, and feeds a phase jump signal PJ-i representative of the phase difference back to each terminal station. After timing acquisition, the reception operation is performed using the reference phase, and a shift amount between the phase of a received signal and the reference phase is fed back to each terminal station as phase synchronization control information PC-i. Each terminal station coarsely adjusts the phase of the spreading code in accordance with the phase jump signal PJ-i, and thereafter finely adjusts the phase of its transmitting signal in accordance with the phase synchronization control information PC-i. It is therefore possible to synchronize the phases of the signals transmitted from terminal stations and received at the base station. Accordingly, an orthogonal code is used for spreading on the reverse links.Type: GrantFiled: June 9, 2003Date of Patent: June 9, 2009Assignees: Hitachi Communication Technologies, Ltd., Hitachi Denshi Kabushiki KaishaInventors: Masayuki Ariyoshi, Nobukazu Doi, Tesshin Shiga, Yoshito Ohta
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Publication number: 20030214932Abstract: In CDMA communications, a base station detects a difference between a reference phase of a spreading code and a phase of a received signal of each terminal station, and feeds a phase jump signal PJ-i representative of the phase difference back to each terminal station. After timing acquisition, the reception operation is performed using the reference phase, and a shift amount between the phase of a received signal and the reference phase is fed back to each terminal station as phase synchronization control information PC-i. Each terminal station coarsely adjusts the phase of the spreading code in accordance with the phase jump signal PJ-i, and thereafter finely adjust the phase of its transmitting signal in accordance with the phase synchronization control information PC-i. It is therefore possible to synchronize the phases of signals transmitted from terminal stations and received at the base station. Accordingly, an orthogonal code is used for spreading on reverse links.Type: ApplicationFiled: June 9, 2003Publication date: November 20, 2003Applicants: HITACHI, LTD., HITACHI DENSHI KABUSHIKI KAISHAInventors: Masayuki Ariyoshi, Nobukazu Doi, Tesshin Shiga, Yoshito Ohta
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Patent number: 6597676Abstract: In CDMA communications, a base station detects a difference between a reference phase of a spreading code and a phase of a received signal of each terminal station, and feeds a phase jump signal PJ-i representative of the phase difference back to each terminal station. After timing acquisition, the reception operation is performed using the reference phase, and a shift amount between the phase of a received signal and the reference phase is fed back to each terminal station as phase synchronization control information PC-i. Each terminal station coarsely adjusts the phase of the spreading code in accordance with the phase jump signal PJ-i, and thereafter finely adjusts the phase of its transmitting signal in accordance with the phase synchronization control information PC-i. It is therefore possible to synchronize the phases of the signals transmitted from terminal stations and received at the base station. Accordingly, an orthogonal code is used for spreading on the reverse links.Type: GrantFiled: April 18, 2000Date of Patent: July 22, 2003Assignees: Hitachi, Ltd., Hitachi Denshi Kabushiki KaishaInventors: Masayuki Ariyoshi, Nobukazu Doi, Tesshin Shiga, Yoshito Ohta
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Patent number: 6137786Abstract: In CDMA communications, a base station detects a difference between a reference phase of a spreading code and a phase of a received signal of each terminal station, and feeds a phase jump signal PJ-i representative of the phase difference back to each terminal station. After timing acquisition, the reception operation is performed using the reference phase, and a shift amount between the phase of a received signal and the reference phase is fed back to each terminal station as phase synchronization control information PC-i. Each terminal station coarsely adjusts the phase of the spreading code in accordance with the phase jump signal PJ-i, and thereafter finely adjusts the phase of its transmitting signal in accordance with the phase synchronization control information PC-i. It is therefore possible to synchronize the phases of the signals transmitted from terminal stations and received at the base station. Accordingly, an orthogonal code is used for spreading on the reverse links.Type: GrantFiled: May 19, 1999Date of Patent: October 24, 2000Assignees: Hitachi, Ltd., Hitachi Denshi Kabushiki KaishaInventors: Masayuki Ariyoshi, Nobukazu Doi, Tesshin Shiga, Yoshito Ohta
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Patent number: 5930244Abstract: In CDMA communications, a base station detects a difference between a reference phase of a spreading code and a phase of a received signal of each terminal station, and feeds a phase jump signal PJ-i representative of the phase difference back to each terminal station. After timing acquisition, the reception operation is performed using the reference phase, and a shift amount between the phase of a received signal and the reference phase is fed back to each terminal station as phase synchronization control information PC-i. Each terminal station coarsely adjusts the phase of the spreading code in accordance with the phase jump signal PJ-i, and thereafter finely adjusts the phase of its transmitting signal in accordance with the phase synchronization control information PC-i. It is therefore possible to synchronize the phases of the signals transmitted from terminal stations and received at the base station. Accordingly, an orthogonal code is used for spreading on the reverse links.Type: GrantFiled: July 7, 1997Date of Patent: July 27, 1999Assignees: Hitachi, Ltd., Hitachi Denshi Kabushiki KaishaInventors: Masayuki Ariyoshi, Nobukazu Doi, Tesshin Shiga, Yoshito Ohta