Patents Examined by Man Phan
-
Patent number: 6026089Abstract: A package for a communication equipment fitted with mechanical locking mechanism and electrical and communication connectivity for allowing power supply distribution as well as communication at least at four distinctive faces (UP, DOWN, RIGHT, LEFT). Each communicating face is fitted with optical transmission and reception devices allowing digital communication between adjacent apparatuses. Each package comprises two faces having each one protrusion at one surface that is intended to enter into a groove machined at a corresponding surface of the next adjacent package in said structure. Each protrusion comprises a locking mechanism for power supply that comprises a camming hook (2200) having a distal end which forceably engages a locking aperture (2210) when pivoted. The hook is pivotally coupled to an axel (2101) extending respectfully through an elongated aperture (2301) formed at one end of a lever arm (2300), and an elongated aperture (2302) of the hook.Type: GrantFiled: December 20, 1996Date of Patent: February 15, 2000Assignee: International Business Machines CorporationInventors: Alain Benayoun, Jean-Francois Le Pennec, Patrick Michel, Patrick Cavallo
-
Patent number: 6021110Abstract: A synchronizing apparatus for a differential OFDM receiver that simultaneously adjust the radio frequency and sample clock frequency using a voltage controlled crystal oscillator to generate a common reference frequency. Timing errors are found by constellation rotation. Subcarrier signals are weighted by using complex multiplication to find the phase differentials and then the timing errors. The reference oscillator is adjusted using the timing errors. Slow frequency drift may be compensated using an integral of the timing error. Frequency offset is found using the time required for the timing offset to drift from one value to another.Type: GrantFiled: January 26, 1999Date of Patent: February 1, 2000Assignee: Telecommunications Research LaboratoriesInventor: Grant McGibney
-
Patent number: 6018521Abstract: A network interface (NI) system provides for communicating encoded digital data between a connection-based network and a plurality of cellular communications networks. Each of the cellular communications networks is comprised of a plurality of cell sites that communicate with a plurality of mobile units via radio signals. The cell sites provide for converting data received in said radio signals (e.g., embedded data) into electronic digital data signals and converting the electronic data signals into radio signals. The connection-based network has a plurality of delivery points which function to translate from the electronic data into a form used by said connection-based network and from the form used by said connection-based network into the electronic data.Type: GrantFiled: December 27, 1996Date of Patent: January 25, 2000Assignee: Motorola, Inc.Inventors: Jeffrey L. Timbs, John M. Sauer, Paul Steinberg, Joseph Pedziwiatr, Steve Lovette
-
Patent number: 6016304Abstract: An RF phase and/or amplitude control device (40) has a digitally controlled attenuator (41) at it input to adjust the overall output level of the output. The device includes an in-phase power divider (43) for splitting up the input signals over two paths (I and Q). The power divided signals in the two paths are further power divided and shifted in relative phase at 180.degree. hybrids (49 and 50). The power divided and phases shifted signals in each path I and Q are selectively switched using switches (51 and 53). The selected and switched output is quadrative combined at a 90.degree. hybrid (55). This provides a single inexpensive device which can provide digitally controlled output signals which are either phase controlled or amplitude controlled or both.Type: GrantFiled: July 31, 1997Date of Patent: January 18, 2000Assignee: Raytheon CompanyInventors: Robert R. Kyle, William F. Dixon, Ronald L. Meyer
-
Patent number: 6011774Abstract: An apparatus for processing an order-wire signal capable of providing a high quality communication between operators through an order-wire channel for use in a synchronous add drop multiplexer(ADM) including a multiplexing unit and a de-multiplexing unit comprises: mixer for mixing two signals to generate a mixed signal, one being a voice signal of an operator at the ADM, the other being an order-wire signal received from a de-multiplexing unit in the ADM; detector for detecting a slip to generate a control signal and generating slip data; and selector for selecting one out of the mixed signal and the received order-wire signal to produce a selected signal, and transmitting the selected signal to the multiplexing unit in the ADM.Type: GrantFiled: December 27, 1996Date of Patent: January 4, 2000Assignee: Daewoo Telecom, Ltd.Inventor: Jae-Kyu Cha
-
Patent number: 6011804Abstract: A method and system for reserving dynamically and in priority for each link of the network the exact amount of bandwidth necessary for the transmission of the network control traffic. An evaluation of the expected control traffic on each link of the network is performed in order to allocate a sufficient but minimum fraction of the link bandwidth and for allocating the maximum available bandwidth for the user traffic.Type: GrantFiled: December 16, 1996Date of Patent: January 4, 2000Assignee: International Business Machines CorporationInventors: Olivier Bertin, Claude Galand, Olivier Maurel
-
Patent number: 6009090Abstract: A code multiplexing wireless apparatus for amplifying a code-multiplexed signal and then transmitting the amplified signal includes the following to reduce output back-off, improve the efficiency of a power amplifier and suppress broadening of the frequency spectrum: (1) a code-multiplexed signal generator for multiplying each item of transmission data by a spreading code sequence and combining spread-spectrum modulated signals to generate a code-multiplexed signal, (2) a signal-peak suppressing unit for holding the envelope of the code-multiplexed signal below a set level, and (3) a power amplifier for amplifying the code-multiplexed signal and transmitting the amplified code-multiplexed signal from an antenna.Type: GrantFiled: June 10, 1997Date of Patent: December 28, 1999Assignee: Fujitsu LimitedInventors: Yasuyuki Oishi, Kazuo Nagatani, Hidenobu Fukumasa, Hajime Hamada, Yoshihiko Asano
-
Patent number: 6002692Abstract: Switch architecture is provided for interfacing a high speed broad bandwidth communication network to a communication fabric having a bandwidth which is a fraction of the high speed broad bandwidth with the network and the fabric having different data packet formats. A multiplex/inverse multiplex unit is provided for converting data packets at the first carrier rate and in the first format to data packets in the second format, and a switch converter then converts the data packet headers in the second format into switch format headers for transmission of the data packets through ports of the communication fabric. A splitter receives the data packets from the switch converter and routes the data packets to one of a plurality of the fabric ports in accordance with the connection identifier in the switch format header, the data packets to one of a plurality of fabric ports being at a second carrier rate.Type: GrantFiled: December 30, 1996Date of Patent: December 14, 1999Assignee: Hyundai Electronics AmericaInventor: Jeffrey M. Wills
-
Patent number: 5999533Abstract: A method of controlling the supply of cells into an asynchronous network, comprises the steps of storing incoming bytes from multiple channels in respective channel buffers, creating in memory a timing event wheel partitioned into a plurality of sectors, of which one is active at any time, and placing cell pointers in the sectors. The cell pointers identify channel buffers and are distributed around the wheel in accordance with a desired transmission schedule. The wheel is stepwise advanced at a predetermined rate, and the cell pointers in the active sector are scanned at each advance of the wheel to identify the corresponding channel buffers. The bytes from the identified channel buffers are assembled into cells, which are forwarded for transmission over the asynchronous network. These are then multiplexed with VBR cells from another source.Type: GrantFiled: June 23, 1997Date of Patent: December 7, 1999Assignee: Mitel CorporationInventors: Mauricio Peres, Hojjat Salemi, Michel Laurence
-
Patent number: 5995520Abstract: In the communication system using the binary phase shift keying (BPSK) modulation method, an erroneous data that might be caused by a carrier slip of carrier wave generated during coherent detection can be compensated. The modulation unit of the transmitter transmits identical data at differentiated timing through BPSK modulation, and the coherent detector circuit of the demodulation unit of the receiver detects waves upon receiving signals. The compensating circuit makes time differences in transmitted data equal and compares them to detect mismatch in order to compensate carrier slip found in the received signal and then the combination circuit realizes the combination.Type: GrantFiled: December 30, 1996Date of Patent: November 30, 1999Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Tatsuya Uchiki, Toshiharu Kojima
-
Patent number: 5982782Abstract: A common resource assigning method is used for a mobile communication system constituted by a plurality of radio base stations and a center station connected to the radio base stations and having a plurality of speech processing mechanisms. In this method, speech frame groups are set by grouping speech frames having different phases on radio interfaces. The speech processing mechanisms are related with the set frame groups. Speech channels are formed by using the speech frame groups in the radio base stations and the specific speech processing mechanisms related thereto.Type: GrantFiled: May 13, 1997Date of Patent: November 9, 1999Assignee: NEC CorporationInventor: Yoshifumi Sasamoto
-
Patent number: 5970064Abstract: A communications network comprising N node elements operates N decision tables for controlling admission and control of data communications to the N node elements (FIG. 2). The performance of the network is optimised with respect to admission and control of commission data. Each node element generates corresponding performance data (FIG. 5), and the N decision tables and N performance data are collected at a central network controller. The network controller determines a set of new decision tables from the collected decision tables (FIG. 10) and distributes a new set of decision tables to each of the N node elements, which then proceed to operate the new decision tables throughout the network.Type: GrantFiled: June 12, 1997Date of Patent: October 19, 1999Assignee: Northern Telecom LimitedInventors: Timothy Ian James Clark, Anthony Richard Phillip White
-
Patent number: 5970053Abstract: A system is disclosed which can measure and control the absolute phase angles of individual coherent Frequency-Division-Multiplexed (FDM) carriers which have been combined to form a composite signal. User-specified phase relationships for the carriers are predetermined to produce an optimum peak factor (peak power to average power ratio) of the composite signal for a given application. In the preferred embodiment, phase relationships chosen to minimize peak factor can dramatically reduce the presence of intermodulation distortion products which can be detrimental to present communication architectures, such as Community Antenna Television (CATV).Type: GrantFiled: December 24, 1996Date of Patent: October 19, 1999Assignee: RDL, Inc.Inventors: Darryl Richard Schick, Mark Anthony Zlotnik, Edward James McQuillen, Jr., Richard Andrew Zadrejko