Patent application number | Description | Published |
20090060005 | Method for using a non-orthogonal pilot signal with data channel interference cancellation - 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. | 03-05-2009 |
20090097455 | ACCESS CHANNEL STRUCTURE FOR WIRELESS COMMUNICATION SYSTEM - 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. The additional pilot symbols embedded in the payload portion are used in a cross product operation to further resolve the effects of multipath fading. | 04-16-2009 |
20090116469 | Reverse link pilot integrated with block codes - 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. | 05-07-2009 |
20090135950 | MAXIMIZING DATA RATE BY ADJUSTING CODES AND CODE RATES - 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. | 05-28-2009 |
20090225718 | TECHNIQUES FOR SETTING UP TRAFFIC CHANNELS IN A COMMUNICATIONS SYSTEM - A control channel supporting traffic control in epochs is divided into two control subchannels each being less than or equal to about a half epoch in duration and occurring serially in time. Slot allocation data may be transmitted and received independently over the subchannels. One subchannel may be used for transmitting forward slot allocation data and the other subchannel may be used for transmitting reverse slot allocation data. The channel split into two subchannels may be a paging channel. The forward and reverse slot allocation data may be transmitted between a base station processor and field unit. Forward and reverse traffic data may be staggered by at least about half an epoch. Transmission of traffic data happens within about two epochs after the assignments. | 09-10-2009 |
20100208612 | Method for Mitigating Adverse Processor Loading in a Personal Computer Implementation of a Wireless Local Area Network Adapter - A personal computer's (PC) microprocessor is used to provide both the physical layer (PHY) and media access control (MAC) processing functions required to implement a wireless local area network (WLAN) adapter. This technique uses the polling mechanism associated with the power save (PS) functionality of WLAN protocol to relieve networking stress on the host processing system. It does this while maintaining networking integrity and packet delivery. The WLAN protocol polling mechanism is used to briefly inhibit the transfer of packets from the WLAN access point (AP) during peak periods of network traffic and/or host processor loading. Because the modulation, demodulation, and MAC functions, typically implemented in dedicated hardware on existing adapters are implemented in software running on the host PC microprocessor, other host system processes and applications can interfere with these time critical functions. Conversely, latency introduced by WLAN specific processing tasks during peak periods of network traffic may cause unacceptable delays to the other processes and applications requiring microprocessor attention. In addition to its primary stated purpose of allowing WLAN mobile stations to save power, this technique will use power save polling as a method for controlling delivery of network packets when the host is heavily loaded or when peak interrupt latencies make reliable packet delivery difficult or impossible. | 08-19-2010 |
20120087364 | REVERSE LINK PILOT INTEGRATED WITH BLOCK CODES - 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. | 04-12-2012 |
20120134341 | MAINTAINING A MAINTENANCE CHANNEL IN A REVERSE LINK OF A WIRELESS COMMUNICATIONS SYSTEM - In a reverse link of a wireless CDMA communication system, a method of maintaining an idling mode connection between a field unit and a base transceiver station is provided using various techniques to maintain the idle mode connection at a reduced power level. A preferred embodiment computes a time slot or frame offset based on modulo function using a field unit identifier in order to distribute field unit maintenance transmissions among available slots or offsets. An alternate embodiment detects explicit signaling states changes at the physical layer and causes power target changes. A further embodiment transmits maintenance data during predetermined time intervals, coordinated between the field units and BTS, allowing power levels to be adjusted accordingly. | 05-31-2012 |
20120250798 | MAXIMIZING DATA RATE BY ADJUSTING CODES AND CODE RATES - 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. | 10-04-2012 |
20130121251 | METHOD FOR SEARCHING PILOT SIGNALS TO SYNCHRONIZE A CDMA RECEIVER WITH AN ASSOCIATED TRANSMITTER - A wireless transmit-receive unit includes an antenna, detection circuitry configured to detect a pseudorandom (PN) offset of a pilot signal received by the antenna while the antenna is adapted to an omnidirectional receive pattern, and monitoring circuitry configured to monitor a received signal strength of the pilot signal as a directional receive pattern of the antenna is steered in order to determine an azimuth angle of the directional pattern that maximizes the pilot signal at the detected PN offset. | 05-16-2013 |
20140086231 | MAINTAINING A MAINTENANCE CHANNEL IN A REVERSE LINK OF A WIRELESS COMMUNICATIONS SYSTEM - In a reverse link of a wireless CDMA communication system, a method of maintaining an idling mode connection between a field unit and a base transceiver station is provided using various techniques to maintain the idle mode connection at a reduced power level. A preferred embodiment computes a time slot or frame offset based on modulo function using a field unit identifier in order to distribute field unit maintenance transmissions among available slots or offsets. An alternate embodiment detects explicit signaling states changes at the physical layer and causes power target changes. A further embodiment transmits maintenance data during predetermined time intervals, coordinated between the field units and BTS, allowing power levels to be adjusted accordingly. | 03-27-2014 |
Patent application number | Description | Published |
20140055128 | STEERING POSITION SENSOR AND METHOD FOR USING THE SAME - A rotation sensor assembly includes a rotated component rotatably coupled with a base. The rotation sensor assembly includes a transmitter and a receiver. The transmitter is coupled with the base or the rotated component. The transmitter generates a magnetic field including a sinusoidally time-varying dipole near-field corresponding to an excitation signal having a first phase value. The receiver is coupled with the other of the rotated component or the base. The receiver detects the magnetic field and generates a reception signal based on the magnetic field with a second phase value corresponding to a rotation angle of the rotated component relative to the base. The receiver is mechanically isolated from the transmitter. A rotation angle module is coupled with the transmitter. The rotation angle module, for instance a phase detector, measures the rotation angle of the rotated component based on the phase difference in the first and second phase values. | 02-27-2014 |
20140129171 | RATE-OF-TURN BIAS ESTIMATION FOR MARINE NAVIGATION - An example includes a method to estimate a bias affecting an inertial sensor. The method can include monitoring a plurality of rate-of-turn samples, from the inertial sensor, in a sequence over time, wherein each of the plurality of rate-of-turn samples includes substantially the same actual bias value that is included in each of the plurality of other rate-of-turn samples. The method can include estimating the bias as a weighted average of the plurality of rate-of-turn samples. The method can include determining an adjusted rate-of-turn sample by subtracting the bias from an instant rate-of-turn sample of the plurality of rate-of-turn samples. The method can include putting out the adjusted rate-of-turn. | 05-08-2014 |
20140254861 | ROW GUIDANCE PARAMETERIZATION WITH HOUGH TRANSFORM - Systems and techniques for row guidance parameterization with Hough transform are described herein. An electronic representation of a field (ERF) can be received. The ERF can include a set of feature sets including one of a set of crop row features or a set of furrow features. A first parameter space can be produced by applying a slope-intercept Hough transform (SLIHT) to members of a feature set. Peaks in the first parameter space can be identified. A second parameter space can be produced by application of the SLIHT to the peaks. A vanishing point can be calculated based on a vanishing point peak in the second parameter space. A track-angle error can be calculated from the vanishing point. | 09-11-2014 |
20140277898 | VEHICLE GUIDANCE BASED ON TRACTOR POSITION - Guiding a leading vehicle according to a desired trailing vehicle path includes generating one or more proceeding paths for one or more intermediate locations along an implement train between a trailing vehicle first location and a leading vehicle second location. The proceeding paths generated with a propagation and transformation algorithm that propagates a preceding path of one of the first location, such as the desired trailing vehicle path, or one of one or more intermediate locations to an immediately proceeding location, and transforms the preceding path according to dimensional characteristics of the implement train. A second guiding path is generated for the leading vehicle second location with the algorithm based on the immediately preceding path of the intermediate location closest to the second location. The method facilitates guidance of the trailing vehicle along the desired trailing vehicle path without navigation markers on the implement train except for the leading vehicle. | 09-18-2014 |
20140277954 | SYSTEM AND METHOD FOR DETERMINING IMPLEMENT TRAIN POSITION - Leading vehicle position information can be used to determine a location and heading of one or more implements of a trailing vehicle in an implement train that includes the leading vehicle. In an example, the leading vehicle pulls one or more trailing vehicles, and information about the leading vehicle position or heading is used to update a function of one or more implements associated with trailing vehicles of the implement train. In an example, the present subject matter includes identifying a heading of a trailing vehicle based on its initial location, an intermediate location, and a destination location. In an example, the present subject matter includes identifying a speed of one or more points on a trailing vehicle. In some examples, the present subject matter includes determining a location, heading, or speed of multiple implements associated with multiple trailing vehicles. | 09-18-2014 |
20150097707 | NON-VISUAL NAVIGATION FEEDBACK SYSTEM AND METHOD - A system for generating a non-visual notification of a machine condition includes a machine condition sensor configured to sense a machine condition. A notification generation controller is in communication with the machine condition sensor. The notification generation controller generates a notification according to the sensed machine condition. In a feedback configuration the notification generation controller compares an integral of a rate of change of the sensed machine condition with a threshold to trigger the generation of a notification. In a guidance configuration the notification generation controller uses the deviation of the machine condition from a guidance direction determined with a steering algorithm to control the generation of a notification. A non-visual notification generator is in communication with the notification generation controller and generates a non-visual notification based on the notification. | 04-09-2015 |
20150112557 | SYSTEM AND METHOD FOR DETERMINING IMPLEMENT TRAIN POSITION - Leading vehicle position information can be used to determine a location and heading of one or more implements of a trailing vehicle in an implement train that includes the leading vehicle. In an example, the leading vehicle pulls one or more trailing vehicles, and information about the leading vehicle position or heading is used to update a function of one or more implements associated with trailing vehicles of the implement train. In an example, the present subject matter includes identifying a heading of a trailing vehicle based on its initial location, an intermediate location, and a destination location. In an example, the present subject matter includes identifying a speed of one or more points on a trailing vehicle. In some examples, the present subject matter includes determining a location, heading, or speed of multiple implements associated with multiple trailing vehicles. | 04-23-2015 |
20150319911 | OPTICAL FLOW SENSING APPLICATION IN AGRICULTURAL VEHICLES - System and techniques for optical flow sensing applications in agricultural vehicles are described herein. A plurality of digital images of an agricultural environment can be obtained from a sensor affixed to agricultural equipment. The plurality of digital images can include a first image and a second image, the second image being captured subsequent to the first image. A transformation of a landmark between the first image and the second image can be identified. A degree of motion for the agricultural equipment relative to an environmental target can be calculated based on the transformation of the landmark. | 11-12-2015 |
20150321694 | REFINED ROW GUIDANCE PARAMETERIZATION WITH HOUGH TRANSFORM - Systems and techniques for refined row guidance parameterization with Hough transform are described herein. An electronic representation of a field (ERF) can be received. A steering variable calculation can be performed by executing a cascaded Hough transform on the ERF. An intermediate value used in calculating the steering variable can be selected. A refined intermediate value can be identified from the intermediate value by measuring a difference between the intermediate value and an anchor value. The steering variable calculation can be adjusted using the refined intermediate value | 11-12-2015 |
20150324648 | IMAGE FILTER BASED ON ROW IDENTIFICATION - System and techniques for an image filter based on row identification are described herein. A crop row center represented in an image of a crop row can be calculated. A filter corresponding to a set of expected crop characteristics of the crop row can be obtained. Elements in the image can then be categorized based on applying the filter to the image when the filter anchored on the crop row. | 11-12-2015 |
20150359163 | ROW GUIDANCE PARAMETERIZATION WITH HOUGH TRANSFORM - Systems and techniques for row guidance parameterization with Hough transform are described herein. An electronic representation of a field (ERF) can be received. The ERF can include a set of feature sets including one of a set of crop row features or a set of furrow features. A first parameter space can be produced by applying a slope-intercept Hough transform (SLIHT) to members of a feature set. Peaks in the first parameter space can be identified. A second parameter space can be produced by application of the SLIHT to the peaks. A vanishing point can be calculated based on a vanishing point peak in the second parameter space. A track-angle error can be calculated from the vanishing point. | 12-17-2015 |