Patents by Inventor Howard Ray Feldman
Howard Ray Feldman 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: 7266097Abstract: A set of formats and protocols is proposed for a satellite communications system. In these formats, a pilot signal (PS) is inserted after every 25 or 29 data symbols. The formats consist of SCPC frames (F) which may contain either data (D) and in-band signaling information (SU), or only signaling information (SU). In either case, the contents of each frame (F) are error-correction coded before transmission with the same coding rate. Each data frame (F) carries the data content of an integral number of input user data frames (M), each of which comprises four subframes. Different symbol transmission rates are used for different input data rates, the symbol transmission rates being selected so that their different synchronizing clock rates can easily be obtained from a common clock. Data bursts may be preceded by a constant power level preamble (P). The formats and protocols satisfy the requirements of a high data rate satellite communications system.Type: GrantFiled: October 2, 2003Date of Patent: September 4, 2007Assignee: Inmarsat Global LimitedInventors: Louis Mimis Christodoulides, Howard Ray Feldman, Eyal Trachtman, Siu Wah Wong, Hok Shuen Wong
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Publication number: 20040114547Abstract: A set of formats and protocols is proposed for a satellite communications system. In these formats, a pilot signal (PS) is inserted after every 25 or 29 data symbols. The formats consist of SCPC frames (F) which may contain either data (D) and in-band signalling information (SU), or only signalling information (SU). In either case, the contents of each frame (F) are error-correction coded before transmission with the same coding rate. Each data frame (F) carries the data content of an integral number of input user data frames (M), each of which comprises four subframes. Different symbol transmission rates are used for different input data rates, the symbol transmission rates being selected so that their different synchronising clock rates can easily be obtained from a common clock. Data bursts may be preceded by a constant power level preamble (P).Type: ApplicationFiled: October 2, 2003Publication date: June 17, 2004Applicant: Inmarsat, Ltd.Inventors: Louis Mimis Christodoulides, Howard Ray Feldman, Eyal Trachtman, Siu Wah Wong, Hok Shuen Wong
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Patent number: 6665361Abstract: A set of formats and protocols is proposed for a satellite communications system. In these formats, a pilot signal (PS) is inserted after every 25 or 29 data symbols. The formats consist of SCPC frames (F) which may contain either data (D) and in-band signalling information (SU), or only signalling information (SU). In either case, the contents of each frame (F) are error-correction coded before transmission with the same coding rate. Each data frame (F) carries the data content of an integral number of input user data frames (M), each of which comprises four subframes. Different symbol transmission rates are used for different input data rates, the symbol transmission rates being selected so that their different synchronizing clock rates can easily be obtained from a common clock. Data bursts may be preceded by a constant power level preamble (P). The formats and protocols satisfy the requirements of a high data rate satellite communications system.Type: GrantFiled: March 4, 1999Date of Patent: December 16, 2003Assignee: Inmarsat, Ltd.Inventors: Louis Mimis Christodoulides, Howard Ray Feldman, Eyal Trachtman, Siu Wah Wong, Hok Shuen Wong
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Publication number: 20030012152Abstract: In a radio frequency communications system, a data carrier activation method is implemented such that the carrier is switched off when no data is available for transmission. If repeated signalling information is required to be transmitted, only a predetermined number of repeats is transmitted before the carrier is switched off. The data input for transmission are compared with an idle sequence with different bit alignments to detect the presence of idle signalling, and the carrier is switched off if a match is found. When more user data is received, the carrier is switched on and frames (SM) are transmitted in synchronization with the timing of frames (SM) transmitted before the carrier deactivation. After carrier reactivation, a constant power preamble (P) may be transmitted to assist in level control in the transmitter (27; 40).Type: ApplicationFiled: May 29, 2002Publication date: January 16, 2003Applicant: International Mobile Satellite OrganizationInventors: Howard Ray Feldman, Siu Wah Wong
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Publication number: 20020075826Abstract: An interface between a data terminal and a digital communications link implements protocols and frame formats designed to reduce delays in a data communication with a remote terminal. The interface overcomes the need to send or receive an HDLC SABME or UA control signal, and allows data to be sent over the digital communications link as soon as the communication parameters are established. In a non-ARQ (error correction) mode, the interface sends control signals and data over the communications link in frames subdivided into many small subframes of fixed length, each subframe having a length code. The interface, when arranged for connection to the data terminal through a telephone network, encodes call progress signals from the telephone network for sending over the digital communications link. The interface encodes and decodes interrupt signals for sending between the data terminal and the digital communications link when an interrupt signal is detected.Type: ApplicationFiled: May 29, 2001Publication date: June 20, 2002Inventors: Howard Ray Feldman, Nobuyuki Kawai, Richard Douglas Lane Smith, Francois-Arnaud Remael
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Patent number: 6393000Abstract: A network station receives a principal signal and data. When the principal signal is present or contains information it is transmitted to a receiving station through a communications channel. When the principal signal is absent or does not have a significant information content, the network station transmits the data through the same communications channel in a format such that the data is received and output by a further receiving station.Type: GrantFiled: July 23, 1997Date of Patent: May 21, 2002Assignee: Inmarsat, Ltd.Inventor: Howard Ray Feldman
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Patent number: 6278696Abstract: An interface between a data terminal and a digital communications link implements protocols and frame formats designed to reduce delays in a data communication with a remote terminal. The interface overcomes the need to send or receive an HDLC SABME or UA control signal for establishing an asynchronous balanced mode, and allows data to be sent over the digital communications link as soon as the communication parameters are established. In a non-ARQ (error correction) mode, the interface sends control signals and data over the communications link in frames subdivided into many small subframes of fixed length, each subframe having a length code indicating an amount of valid information but without CRC, address or control information. The interface, when arranged for connection to the data terminal through a telephone network, encodes call progress signals from the telephone network for sending over the digital communications link.Type: GrantFiled: December 22, 1997Date of Patent: August 21, 2001Assignee: Inmarsat, Ltd.Inventors: Howard Ray Feldman, Nobuyuki Kawai, Richard Douglas Lane Smith, Francois-Arnaud Remael
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Patent number: 6205173Abstract: A communications link for data communication via satellite includes interface apparatus comprising a satellite link interface for connection to a satellite link and a PSTN interface for connection to a PSTN. The interface apparatus supports different data compression modes in the communication link. Mode A allows data compression over the PSTN but not over the satellite link. Mode B allows data compression over the PSTN and over the satellite link, but enables decompression and recompression of data flowing in each direction through the interface apparatus. Mode C allows compressed data to pass transparently between the PSTN and the satellite link, while the interface apparatus performs error correction on the satellite link and on the PSTN.Type: GrantFiled: February 27, 1998Date of Patent: March 20, 2001Assignee: International Mobile Satellite OrganizationInventors: Joan Obradors, Howard Ray Feldman, Francois-Arnaud Remael