Patents Assigned to IPR Licensing, Inc.
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Patent number: 7502351Abstract: In an illustrative embodiment of the present invention, a channel is allocated to carry messages from each of multiple subscriber units to a base station. Selected messages generated by a subscriber unit that would otherwise be transmitted over an assigned reverse link traffic channel are instead encoded and transmitted to the base station over a shared reverse link channel. Preferably, the shared reverse link channel is time-slotted and each subscriber unit transmits information to the base station in an assigned time slot so that the base station receiving the messages can identify from which subscriber unit a message is sent. Certain bits in a time slot of the shared channel as set by a subscriber unit can be used to communicate a particular message to the base station. For instance, a single bit that is transmitted in a time slot can be encoded to transmit a substitute message from one of the multiple subscriber units to a base station, where the setting of the bit itself indicates a message type.Type: GrantFiled: September 26, 2005Date of Patent: March 10, 2009Assignee: IPR Licensing, Inc.Inventors: Kevin L. Farley, James A. Proctor, Jr.
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Patent number: 7502424Abstract: The present invention provides for making code rate adjustments and modulation type adjustments in a pseudonoise (PN) encoded CDMA system. Coding rate adjustments may be made by changing the number of information bits per symbol, or Forward Error Code (FEC) coding rate. A forward error correction (FEC) block size is maintained at a constant amount. Therefore, as the number of information bits per symbol are increased, an integer multiple of bits per epoch is always maintained. The scheme permits for a greater flexibility and selection of effective data rates providing information bit rates ranging from, for example, approximately 50 kilobits per second to over 5 mega bits per second (Mbps) in one preferred embodiment.Type: GrantFiled: December 5, 2006Date of Patent: March 10, 2009Assignee: IPR Licensing, Inc.Inventors: John E. Hoffmann, George Rodney Nelson, Jr., Daniel I. Riley, Antoine J. Rouphael, James A. Proctor, Jr.
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Publication number: 20090060005Abstract: A system and method for encoding/decoding data channels in a CDMA system having data channel interference cancellation, wherein data channel interference cancellation is used to remove unwanted non-orthogonal pilot signal components which are present within a demodulated data signal. This is accomplished by regenerating interference terms with respect to the non-orthogonal pilot signal and subtracting them from the demodulated data signal.Type: ApplicationFiled: September 22, 2008Publication date: March 5, 2009Applicant: IPR Licensing, Inc.Inventors: Antoine J. Rouphael, John E. Hoffmann, George Rodney Nelson, JR., James A. Proctor, JR.
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Patent number: 7499684Abstract: A technique to share a local oscillator signal between two radio frequency integrated circuits (RFICs). The local oscillator signal generated internally by one RFIC is ported to the other RFIC for use in transmit and/or receive operation. The local oscillator signal that is ported may be an RF local oscillator signal. Each RFIC may include a bi-directional port circuit that can be operated to make the RFIC a master, slave or may be totally disabled to disable the porting feature. This is particularly useful in RFICs that are used to communicate using MIMO radio algorithms which rely for optimum performance on phase and frequency coherency among a plurality of transmitters and a plurality of receivers.Type: GrantFiled: December 4, 2003Date of Patent: March 3, 2009Assignee: IPR Licensing, Inc.Inventor: Mark S. Cavin
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Patent number: 7483500Abstract: An Automatic Gain Control (AGC) circuit as used in a digital receiver that utilizes a main loop filter that is of a relatively wide bandwidth. A pre-filter, wideband variance is determined from the input digital signal, and a post-filter, narrowband variance is also determined. The wideband and narrowband variances are then compared to determine if the wideband signal power indicates a variance level that is too great to permit normal loop operation. By reapplying this difference in the power levels to the filter output as needed, such as by a scaling operation, the loss in dynamic range is effectively recovered. In a preferred embodiment, an adjustable gain input amplifier feeds an intermediate frequency (IF) signal to an analog-to-digital converter (ADC). The digitized IF signal is then down-converted to a baseband frequency and subjected to digital filtering. A narrowband sample variance (PN) of the digitally filtered (narrowband) data is then determined.Type: GrantFiled: April 6, 2006Date of Patent: January 27, 2009Assignee: IPR Licensing, Inc.Inventors: Mark J. Takatz, Alton S. Keel, Jr., Stefan Haenggi
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Patent number: 7483473Abstract: A technique for efficient implementation of pilot signals on a reverse link in a wireless communication system. An access channel is defined for the reverse link such that within each frame, or epoch, a portion is dedicated to sending only pilot symbols. Another portion of the frame is reserved for sending mostly data symbols; however, within this second portion of the frame, additional pilot symbols are interleaved among the data symbols. The pilot symbol or preamble portion of the access channel frame allows for efficient acquisition of the access signal at the base station, while providing a timing reference for determining the effects of multipath fading. In particular, a pilot correlation filter provides a phase estimate from the pilot symbols in the preamble portion, which is then used to decode the data symbols in the payload portion. An access acquisition portion of the receiver uses the phase estimates provided by the pilot correlation filter to process the output of a data symbol correlation filter.Type: GrantFiled: April 11, 2005Date of Patent: January 27, 2009Assignee: IPR Licensing, Inc.Inventors: John E. Hoffmann, George Rodney Nelson, Jr., James A. Proctor, Jr., Antoine J. Rouphael
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Patent number: 7483706Abstract: A system apparatus for wireless communication that includes receiving, receiving data for a subscriber, determining the subscriber to whom the data is addressed, determining which cell the subscriber currently resides, and transmitting the data accordingly.Type: GrantFiled: November 6, 2006Date of Patent: January 27, 2009Assignee: IPR Licensing, Inc.Inventors: Kevin Farley, Thomas Gorsuch
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Patent number: 7447187Abstract: A technique for encoding digital communication signals. Data symbols are augmented in pilot symbols inserted at predetermined positions. The pilot augmented sequence is then fed to a deterministic error correction block encoder, such as a turbo product coder, to output a coded sequence. The symbols in the error correction encoded sequence are then rearranged to ensure that the output symbols derived from input pilot symbols are located at regular, predetermined positions. As a result, channel encoding schemes can more easily be used which benefits from power of two length block sizes.Type: GrantFiled: June 22, 2004Date of Patent: November 4, 2008Assignee: IPR Licensing, Inc.Inventors: John E. Hoffmann, George Rodney Nelson, Jr., James A. Proctor, Jr., Antoine J. Rouphael
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Patent number: 7428263Abstract: A system and method for encoding/decoding data channels in a CDMA system having data channel interference cancellation, wherein data channel interference cancellation is used to remove unwanted non-orthogonal pilot signal components which are present within a demodulated data signal. This is accomplished by regenerating interference terms with respect to the non-orthogonal pilot signal and subtracting them from the demodulated data signal.Type: GrantFiled: June 27, 2006Date of Patent: September 23, 2008Assignee: IPR Licensing, Inc.Inventors: Antoine J. Rouphael, John E. Hoffmann, George Rodney Nelson, Jr., James A. Proctor, Jr.
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Publication number: 20080225991Abstract: A method for synchronizing a CDMA receiver to a transmitter when an adaptive antenna is utilized to receive transmitted data, wherein a receiving antenna system is adapted between a 360° reception angle pattern (i.e., an omni-directional pattern) and a fixed reception angle (i.e., a directional pattern) by permitting the receiver to identify a pilot signal having the largest magnitude. The receiver minimizes interference from other pilot signals by steering antenna pattern nulls toward other transmitters. As a result, the time required for the receiver to acquire a valid pilot signal is significantly reduced.Type: ApplicationFiled: June 14, 2007Publication date: September 18, 2008Applicant: IPR Licensing, Inc.Inventors: James A. Proctor, Antoine J. Rouphael, John E. Hoffmann, George R. Nelson
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Patent number: 7426241Abstract: A technique for encoding a signal used in a digital communication system in which individual traffic channel data rates may be adapted to specific channel conditions. In particular, a forward error correction coding rate is adapted for individual channels while at the same time maintaining a fixed block size independent of the FEC coding rate. This allows the system data rate to adapt to the channel conditions experienced by a specific user. Thus, users experiencing good communication conditions with low multipath distortion may be allocated higher capacity, whereas users with significant multipath distortion may make use of lower rate (higher levels of coding) error codes to maintain high quality. Messages are sent from a transmitter to a receiver to inform the receiver of the coding rate implemented at any given point in time.Type: GrantFiled: July 13, 2004Date of Patent: September 16, 2008Assignee: IPR Licensing, Inc.Inventor: James A. Proctor, Jr.
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Publication number: 20080095260Abstract: In a wireless communication device, transmit weights are iteratively processed to compensate for any group delay caused by receive synchronization in the receive device. A transmit matrix of weights is computed from signals transmitted by a second communication device and received at a plurality of antennas of the first communication device. The transmit matrix processing includes normalizing a transmit weight vector with respect to a mode of the transmit weight associated with one of the plurality of antennas.Type: ApplicationFiled: December 11, 2007Publication date: April 24, 2008Applicant: IPR Licensing Inc.Inventor: Chandra Vaidyanathan
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Publication number: 20080056185Abstract: A technique for distributing channel allocation information in a demand access communication system. Multiple access codes are used that have a defined code repeat period or code epoch. For each such epoch duration, a schedule of assignment of traffic channels to active terminals for each epoch is determined. For each terminal designated as active during the epoch, a list of active channels for such terminal unit is assigned. Prior to the start of each epoch, a channel set up message is sent on one of the forward link channels, such as a paging channel, indicating the lists of active channels for epochs of the associated traffic channel(s) that are to follow.Type: ApplicationFiled: October 29, 2007Publication date: March 6, 2008Applicant: IPR Licensing, Inc.Inventors: Pertti Alapuranen, Kevin Johnson, Kevin Farley
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Patent number: 7332967Abstract: A VGA is provided that is designed to reduce or even eliminate entirely variations in phase response/shift with changes in gain. Compensation is made for parasitic capacitances of elements in the VGA that would otherwise cause variation in phase with changes in gain. An additional capacitance is introduced to the VGA to compensate for the sources of the parasitic capacitance. The technique for introducing the additional capacitance depends on the source of the parasitic capacitance being treated. The additional capacitance is introduced to one or more of transistor amplifier circuits in the VGA, wherein each transistor amplifier circuit has a different gain and one of the transistor amplifier circuits is selected depending on the desired gain of the VGA. These compensation techniques equalize the phase response of the transistor amplifier circuits (each having a different gain) so that regardless of which transistor amplifier circuit is selected, the phase shift will be substantially the same.Type: GrantFiled: January 12, 2005Date of Patent: February 19, 2008Assignee: IPR Licensing Inc.Inventors: John W. M. Rogers, David G. Rahn, A. David Moore
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Publication number: 20080014977Abstract: An equal gain composite beamforming technique which constrains that the power of the signal output by each antenna is the same, and is equal to the total power of the transmit signal divided by the number N of transmit antennas from which the signal is to be transmitted. By reducing output power requirements for each power amplifier, the silicon area of the power amplifiers are reduced by as much as N times (where N is equal to the number of transmit antennas) relative to a non-equal gain CBF.Type: ApplicationFiled: July 16, 2007Publication date: January 17, 2008Applicant: IPR Licensing Inc.Inventors: Gary Sugar, Chandra Vaidyanathan
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Patent number: 7308287Abstract: In a wireless communication device, transmit weights are iteratively processed to compensate for any group delay caused by receive synchronization in the receive device. A transmit matrix of weights is computed from signals transmitted by a second communication device and received at a plurality of antennas of the first communication device. The transmit matrix processing includes normalizing a transmit weight vector with respect to a mode of the transmit weight associated with one of the plurality of antennas. The processed transmit matrix is then applied to a transmit signal to produce a plurality of transmit signals to be simultaneously transmitted from corresponding ones of the plurality of antennas of the first communication device. A plurality of eigenmodes is transmitted accordingly between the two devices in a converging iteration.Type: GrantFiled: July 14, 2006Date of Patent: December 11, 2007Assignee: IPR Licensing Inc.Inventor: Chandra Vaidyanathan
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Publication number: 20070263657Abstract: In a wireless communication network having a plurality of devices operating at different data rates that contend for access to the network, a method is provided that assigns network access parameters to one or more of the devices so as to control throughput on the network. Examples of network access control parameters are the maximum data packet size and the contention window size. Generally, the network access control parameter for slower data rate users is configured so that they do not occupy the network a disproportionate amount of time compared to faster data rate users.Type: ApplicationFiled: July 20, 2007Publication date: November 15, 2007Applicant: IPR Licensing Inc.Inventors: Gary Sugar, William Seed, Anthony Collins
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Patent number: 7289827Abstract: An antenna for use with a receiver in a wireless communications system includes antenna elements for generating antenna patterns, and a first module for applying weights to a signal received at each of the antenna elements to generate a selected one of the antenna patterns. A second module detects the received signal at each of the antenna elements. A combiner combines the received signal detected at each of the antenna elements to produce a combined received signal for a selected antenna pattern. A third module determines a signal quality metric for the combined received signal at each selected antenna pattern. The first module is responsive to the determined signal quality metrics for adjusting the weights to generate a preferred antenna pattern.Type: GrantFiled: September 9, 2004Date of Patent: October 30, 2007Assignee: IPR Licensing, Inc.Inventors: James Arthur Proctor, Jr., Lawrence Wayne La Mont, Jr., George Rodney Nelson, Jr., Kenneth Marvin Gainey
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Patent number: 7289469Abstract: A technique for distributing channel allocation information in a demand access communication system. In a preferred embodiment, for use with Code Division Multiple Access (CDMA) type communication, multiple access codes are used that have a defined code repeat period or code epoch. For each such epoch duration, a central controller, such as located at a base station in the case of operating a forward link, determines a schedule of assignment of traffic channels to active terminals for each epoch. For each terminal designated as active during the epoch, an active terminal unit identifier is assigned. For each terminal designated as active during the epoch, the base station assigns a list of active channels for such terminal unit. Prior to the start of each epoch, a channel set up message is sent on one of the forward link channels, such as a paging channel.Type: GrantFiled: February 7, 2005Date of Patent: October 30, 2007Assignee: IPR Licensing, Inc.Inventors: Pertti Olavi Alapuranen, Kevin P. Johnson, Kevin L. Farley
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Publication number: 20070242736Abstract: A system causes a scan angle of a directional antenna to change temporarily from a current scan angle to at least one trial scan angle during reception of predetermined portions of an information carrying signal. At the trial scan angle(s), a trial metric associated with each trial scan angle is determined by the system. The system then selects a next scan angle based on the trial metrics. Examples of predetermined portions of the information carrying signal include the Power Control Bit (PCB) and Forward Error Correction (FEC) block.Type: ApplicationFiled: June 5, 2007Publication date: October 18, 2007Applicant: IPR Licensing, Inc.Inventors: James Proctor, Carlo Amalfitano, Kil Ryu