Patents Assigned to Lucent Technologies
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Patent number: 6445477Abstract: In accordance with the invention, a wavelength stable optical source comprises at least one adjustable wavelength optical source, a multipath Mach-Zehnder interferometer (MMZI) for receiving a signal from the adjustable source and providing a primary output and one or more secondary outputs, and a feedback arrangement responsive to the outputs for adjusting the wavelength source. Photodetectors coupled to the primary output and one or more of the secondary outputs provide feedback information for maintaining wavelength stability.Type: GrantFiled: February 11, 1999Date of Patent: September 3, 2002Assignee: Lucent TechnologiesInventors: Christi Kay Madsen, Julian Bernard Soole
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Patent number: 6445360Abstract: The invention involves a novel mechanical assembly incorporating, in a preferred embodiment, a technically advanced Cassegrain antenna design. The antenna achieves, in experiments, near theoretical performance with the minimum size. The Cassegrain antenna incorporates an intergrated DR array feed.Type: GrantFiled: March 13, 2001Date of Patent: September 3, 2002Assignee: Lucent Technologies Inc.Inventors: Hazim Basheer Al-Rawi, Andrew John Fox, Anthony Martin
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Patent number: 6443010Abstract: An apparatus for detecting blockage of a porous medium of an air filter utilized to filter air within a forced air stream contained within an enclosure. The air filter extends in a direction transverse to a direction of the forced air stream. The detection is accomplished with an opening in the porous medium of a greater dimension than provided by the porous medium. The opening is defined by the porous medium of the air filter and extends through the porous medium through which airflow from the forced air stream passes. A flexible member is provided which is positioned within the air flow from the forced air stream which passes through the opening and received by the flexible member causing the flexible member to vibrate and emit an audible sound in response to the air flow.Type: GrantFiled: December 16, 1999Date of Patent: September 3, 2002Assignee: Lucent Technologies Inc.Inventor: William Harold Scofield
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Patent number: 6445751Abstract: Frequency offset of a receiver employing frequency or phase shift keying is estimated by performing a pair-wise weighted summation of consecutive received training symbols, where each weighting factor is related to the ratio of the corresponding training symbols that were originally transmitted (known a priori). Specifically, the following sum is evaluated for the n symbol training sequence (y1, y2, . . . , yn) which is received when the training sequence (x1, x2, . . .Type: GrantFiled: January 29, 1999Date of Patent: September 3, 2002Assignee: Lucent Technologies Inc.Inventor: William J. Liew
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Patent number: 6445847Abstract: A design technique minimizes the loss and ripple in the spectral response of an optical filter formed using a pair of gratings connected by an array of optical elements. This filter can be, for example, two waveguide grating routers (WGRs) connected by an array of waveguides. Each WGR includes two star couplers connected by waveguide grating arms. The smoothest spectral response is achieved for a given set of connecting waveguides, by choosing the number of grating arms less than or equal to filling the star coupler central Brillouin zone made by the set of connecting waveguides resulting in the connecting waveguides neither substantially over- or under-sampling the optical spectrum from the waveguide gratings. Exactly filling the Brillouin zone with the grating arms minimizes the loss, and so is the preferred choice.Type: GrantFiled: October 28, 1999Date of Patent: September 3, 2002Assignee: Lucent Technologies Inc.Inventor: Christopher Richard Doerr
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Patent number: 6445929Abstract: A unique method and apparatus for allowing a wireless communication system to offer increased IMSI number functionality and corresponding global roaming capability by converting an identification number received from a particular mobile station in the wireless communication system in a first format to a second format which allows for use of more information included in the identification number is disclosed. A variable length IMSI number in TIA/EIA/IS-95 format is received at a base station in encoded form. The base station decodes the parameters included in the IMSI number into their original decimal values, and, if all parameters have not been sent in accordance with the IMSI type, will add the proper values for the unsent parameters. The MCC, IMSI_S, and IMSI_11_12 parameters of the IMSI number are then stored in a 15-digit IMSI array. The contents of each location of the 15-digit array are associated with a specific location in an 8-octet structure which is required by ANSI/TIA/EIA-41.Type: GrantFiled: April 1, 1999Date of Patent: September 3, 2002Assignee: Lucent Technologies Inc.Inventors: Vishal S. Chandnani, Anita R. Garvert
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Patent number: 6445750Abstract: In a communications system implementing an in-band on channel AM (IBOC-AM) (also known as “hybrid IBOC-AM”) scheme, digitally modulated signals are transmitted in a 30 kHz digital band centered at an analog host AM carrier frequency fc. The host AM carrier is assigned to the geographic area served by the communications system for AM radio broadcast. It is likely that a similar IBOC-AM scheme is implemented in an adjacent area which is assigned a second analog host AM carrier having a frequency which is either 20 kHz higher or lower than fc. In that case, the transmission of the digitally modulated signals are interfered by a similar transmission in the adjacent area. The interference is known as “second adjacent channel interference.” To reduce such interference, selected power profiles in accordance with the invention are used to allocate the relative transmission power to the digitally modulated signals in the digital band.Type: GrantFiled: April 22, 1998Date of Patent: September 3, 2002Assignee: Lucent Technologies Inc.Inventors: Brian Chen, Carl-Erik Wilhelm Sundberg
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Patent number: 6445937Abstract: A mobile telephone power management method and apparatus is disclosed that places the telephone in a dormant, or idle, mode. In this mode, battery power is only supplied to a device incorporated into the mobile telephone that monitors incoming radio frequency (RF) signals. If the device detects an inbound call, the device sends signals to switch on battery power to the mobile telephone baseband microprocessor. The device also sends stored registration information to the baseband microprocessor, thereby allowing the telephone to rapidly switch to active mode, and to answer the inbound call. This method allows the telephone to effectively emulate standby mode for weeks rather than days without the need for battery recharging.Type: GrantFiled: December 2, 1999Date of Patent: September 3, 2002Assignee: Lucent Technologies Inc.Inventor: Ivan Pereira daSilva
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Patent number: 6445865Abstract: A cable jumper bend limiter arrangement for a fiber distribution shelf that is readily adaptable for use in conventional fiber distribution frames. The shelf jumper bend limiter arrangement of the invention operates to maintain minimum bend radii for jumpers routed via the shelf and facilitates increased storage and routing space for jumper cables routed in jumper troughs of distribution frames in which the shelves are installed. Radial guides that form the bend limiters for the distribution shelf of the invention are disposed predominantly within the perimeter of the shelf and extend only minimally beyond an edge of the shelf.Type: GrantFiled: September 29, 2000Date of Patent: September 3, 2002Assignee: Lucent Technologies, Inc.Inventors: Neal A. Janus, Anthony Pellegrino, Randy Alan Reagan
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Patent number: 6445686Abstract: It has been recognized that in a wireless communication system certain frames of encoded speech data transmitted between a base station and a mobile unit, or between a mobile unit and a base station, are more critical than others. A frame may be determined to be erased by the receiving base station or mobile unit due to noise or interference over the wireless transmission medium. If an erased frame cannot be recreated from one or more preceding frames, then it is more critical than a frame that can be recreated by an extrapolation of data from one or more preceding frames. Accordingly, on a frame-by-frame basis, each frame in a sequence of frames is identified as being critical or non-critical. Each frame that is identified as being critical is then transmitted in a manner that is more robust than the manner in which non-critical frames are transmitted to decrease the likelihood that a receiver will determine that the frame is erased.Type: GrantFiled: September 3, 1998Date of Patent: September 3, 2002Assignee: Lucent Technologies Inc.Inventors: Joseph P. Hoffbeck, Martin Howard Meyers, Al-Nasir A. Premji, Ahmed A. Tarraf, Kevin G. Tracy
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Patent number: 6445915Abstract: An apparatus, method and system are disclosed for providing variable termination and alerting patterns, based upon call progress information, for multiple leg telecommunication sessions, such as for flexible alerting. The preferred wireless system embodiment includes a home location register (HLR) and a mobile switching center (MSC). The HLR stores a plurality of secondary directory numbers(with corresponding routing parameters) associated with a pilot directory number. The MSC differentially processes and routes each outgoing call leg associated with each secondary directory number, to form a plurality of outgoing call legs. As the various outgoing call legs may be answered, not answered, released, have routing failures, or return busy signals, the MSC generates, and transmits to the HLR, corresponding call progress and status information. Based upon such information, the HLR may dynamically vary the termination and alerting patterns for outgoing call legs corresponding to the secondary directory numbers.Type: GrantFiled: July 9, 1999Date of Patent: September 3, 2002Assignee: Lucent Technologies Inc.Inventors: Robert John Baiyor, Deborah Thomas Earl, Harold Robert Smith, Jr., Thomas Dale Strom
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Patent number: 6445492Abstract: A Raman amplified transmission includes at least two pump sources to provide amplification to optical signals residing in the C-band (1530-1562 nm) and L-band (1574-1604 nm). The pump signals are chosen so as to provide for a relatively flat and wide composite gain spectrum with a width at least 50% greater than that generated by a monochromatic pump, while also chosen so as to prevent any four-wave mixing products from being in either the C- or L-bands.Type: GrantFiled: March 3, 2000Date of Patent: September 3, 2002Assignee: Lucent Technologies Inc.Inventors: Torben N. Nielsen, Karsten Rottwitt, Andrew John Stentz
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Patent number: 6445496Abstract: A free-space wireless optical communication system is disclosed that utilizes a telescope design having aspherical mirrors, such as a Ritchey-Chretien (RC) telescope. RC telescopes are characterized by a concave primary mirror and a convex secondary mirror each having a hyperbolic shape. The disclosed mirror configuration provides a larger focal plane that allows for automatic alignment between a transmitter and receiver with a stationary or fixed mirror design, further contributing to a lower fabrication cost. Among other benefits, the larger focal plane permits an n×n fiber array to be positioned in the focal plane of the RC optical telescope, thereby enabling point-to-multipoint communications with a single optical telescope. Each fiber in the n×n fiber array of a transmitting telescope can be focused on a different receiving telescope in a wireless optical communication system.Type: GrantFiled: October 5, 2000Date of Patent: September 3, 2002Assignee: Lucent Technologies Inc.Inventors: Herman Melvin Presby, John A. Tyson
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Patent number: 6446147Abstract: A method and circuit for performing a wired-or function in a differential transmission environment are disclosed. The wired-or function is realized by enabling the differential driver portion of the differential transceiver when the signaling path is to be driven with a logical true signal and disabling the differential driver portion when a logical false signal is to transmitted to the signaling path. In a preferred embodiment, a 1394 backplane node (a node is a single connection to the bus which may or may not be shared by multiple devices) is implemented using commercially available chips including a physical arbiter, a link controller, a differential transceiver, a programmable logic device, and some additional transistors.Type: GrantFiled: May 13, 1999Date of Patent: September 3, 2002Assignee: Lucent Technologies Inc.Inventors: Miguel Dajer, Kenneth Yiu-Kwong Ho, Chang H. Kim
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Patent number: 6445916Abstract: A method for evaluating quality of service for billing purposes in a wireless communications system includes establishing a target quality of service level for a subscriber station; expending resources of the wireless communications system at a resource level to maintain the established target quality of service level; measuring the actual quality service level over the measuring interval to characterize the actual quality of service with respect to the target quality of service level as a compliant interval or a non-compliant interval temporally coextensive with the measuring interval.Type: GrantFiled: January 7, 1999Date of Patent: September 3, 2002Assignee: Lucent Technologies Inc.Inventor: Mohamed Anisur Rahman
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Patent number: 6446108Abstract: A method for a client to locate a particular service from a service provider on wide area computer networks. The method includes multicasting of an advertisement from a service provider, which advertisement is detected by a Service Broker and in turn multicast into the wide area computer network. A client queries the network when seeking a particular service and receives in turn the address of the Broker and a Server to obtain the service desired.Type: GrantFiled: April 22, 1998Date of Patent: September 3, 2002Assignee: Lucent Technologies Inc.Inventors: Jonathan D. Rosenberg, Henning G. Schulzrinne, Bernhard Suter
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Patent number: 6445922Abstract: A method and system are disclosed for supporting overlapping IP addresses by sharing a mobile node identifier between an IWF and a Foreign Agent in a visited data (e.g., wireless) network. The mobile node identifier is stored in lookup tables associated with the IWF (Mobile Identity table) and the Foreign Agent (Visitor List table). When a data packet travels between the IWF and the Foreign Agent, the mobile node identifier is attached to it. For data packets moving in the reverse Mobile IP traffic direction (from the mobile node), the Foreign Agent uses the mobile node identifier to identify the correct Home Agent destination by finding the corresponding Home Agent address in the Visitor List table. For forward Mobile IP traffic (to the mobile node), the IWF uses the mobile node identifier to identify the correct mobile node destination by finding the corresponding link identifier in the Mobile Identity table.Type: GrantFiled: December 15, 1999Date of Patent: September 3, 2002Assignee: Lucent Technologies Inc.Inventors: Thomas Lloyd Hiller, Jin Wang
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Patent number: 6446087Abstract: The system for maintaining the integrity of application data functions to provide a mechanism to generate safe and efficient database transactions. This is accomplished by minimizing the number of constraints applied to the data stored in the database by segmenting the database into two portions: a set of base data objects and a set of view data objects. The base data objects comprise a set of data that is normalized to reduce the need for complex integrity checks. The set of view data objects represents views of the base data objects as presented in a form needed by the various applications extant in the processor. The system for maintaining the integrity of application data enables the applications to access both the view data objects the base data objects, but to effect a change in the data contained therein, access via an integrity checking process is only provided to the base data objects.Type: GrantFiled: November 4, 1998Date of Patent: September 3, 2002Assignee: Lucent Technologies Inc.Inventor: Michael C. Lai
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Patent number: 6445693Abstract: A method and apparatus are disclosed for estimating the power of the first adjacent FM interference and for using the estimated power to identify the number of OFDM bins that are at least partially corrupted by the first adjacent FM interference. The number of corrupted bins, Ncorr, is obtained based on measurements of the power of each of the first adjacent FM analog interference, Ik, and the power of the background noise, Nk, of the digital side bands. The power measurements, together with the known slope of the first adjacent FM analog interference, is used to identify when the power of the measured background level equals the prorated power of the slope. All of the bins that fall below a threshold value are determined to be at least partially corrupted.Type: GrantFiled: September 15, 1999Date of Patent: September 3, 2002Assignee: Lucent Technologies Inc.Inventors: Mohsen Sarraf, Mohammad Hossein Zarrabizadeh
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Publication number: 20020118423Abstract: A method and apparatus for remodulating an optical data stream such that a second modulated data stream is optically transported along with a first modulated data stream. In one embodiment, an optical signal having modulated thereon a first data stream is split into a plurality of reduced power optical signals, wherein at least one of the reduced power optical signals is remodulated to additionally include a second data stream. The first data stream is preferably Manchester encoded, the data rate of the second data stream is preferably one half the data rate of the first data stream.Type: ApplicationFiled: February 26, 2001Publication date: August 29, 2002Applicant: Lucent Technologies Inc.Inventor: Brandon C. Collings