| Patent application number | Description | Published |
|---|
| 20080260008 | METHODS AND APPARATUS FOR TIME TRACKING USING ASSISTANCE FROM TDM PILOTS IN A COMMUNICATION NETWORK - Methods and apparatus for time tracking using assistance from TDM pilots in a communication network. In an aspect, a method is provided for time tracking in a device operating on a communication network, wherein the device performs a time tracking algorithm. The method includes determining a delay spread, and modifying at least one parameter used by the time tracking algorithm based on the delay spread. In another aspect, an apparatus is provided for time tracking in a device operating on a communication network, wherein the device performs a time tracking algorithm. The apparatus includes computation logic for determining a delay spread, and control logic for modifying at least one parameter used by the time tracking algorithm based on the delay spread. | 10-23-2008 |
| 20090190675 | SYNCHRONIZATION IN A BROADCAST OFDM SYSTEM USING TIME DIVISION MULTIPLEXED PILOTS - In an OFDM system, a transmitter broadcasts a first TDM pilot on a first set of subbands followed by a second TDM pilot on a second set of subbands in each frame. The subbands in each set are selected from among N total subbands such that (1) an OFDM symbol for the first TDM pilot contains at least S | 07-30-2009 |
| 20100002817 | METHOD AND APPARATUS FOR ADAPTIVE TIMING SYNCHRONIZATION IN A COMMUNICATION NETWORK - An adaptive timing synchronization process dynamically adapts timing synchronization parameters for both wide and local area channels based on channel estimates. Timing synchronization parameters are dynamically adapted according to C/I estimates calculated from WID/LID energies. The timing synchronization algorithm | 01-07-2010 |
| 20100034242 | METHODS AND APPARATUS FOR DETERMINING TIMING IN A WIRELESS COMMUNICATION SYSTEM - Methods and apparatus for setting timing of sampling of one or more symbols. The disclosed methods account for at least three types of effective interference (EI) and are used to set the timing of a sampling window for sampling received symbols. The methods includes setting timing based on determining an energy density function accounting for both static and dynamic EI, determining the minimum of a total energy profile and sliding the sampling window to ensure that the minimum point is at a predetermined point, and determining and using a composite energy profile accounting for short term and long term fading effects. The disclosed apparatus include a transceiver employing one or more of the disclosed methods for setting timing when receiving the symbols. | 02-11-2010 |
| 20100074317 | TRUNCATION OF NOISY TAPS IN CHANNEL ESTIMATION - Methods and systems are described for processing a signal in wireless communications. The signal may have synchronization information. A method of processing a signal having synchronization information may include receiving the signal, and determining a truncation region of the time domain estimated channel, the estimated channel having taps. The method further includes processing the channel taps within the truncation region. | 03-25-2010 |
| 20100157833 | METHODS AND SYSTEMS FOR IMPROVED TIMING ACQUISITION FOR VARYING CHANNEL CONDITIONS - An improved receiver apparatus and acquisition algorithm using TDM pilots is disclosed. The timing acquisition method presented provides capabilities for adapting to changing channel conditions, in particular varying expected delay spreads. The information on an expected delay spread can be fed back to the initial acquisition algorithm based on previous successful attempts, and the delay spreads measured at that time, such as to set the length of the detection window used to in the TDM pilot processing. Based on the delay spread information, the algorithm for processing the specialized TDM pilot can adaptively modify the timing acquisition parameters for more robust performance under interference conditions. This may involve reducing the length of the detection window to just a little more than or equal to the maximum expected delay spread, which reduces sensitivity of the fine timing acquisition to signal noise. | 06-24-2010 |
| 20100220821 | NARROW-BAND INTERFERENCE CANCELLER - The disclosure is directed to a receiver, and methods therefor, including an automatic gain control circuit with a first digital variable gain amplifier that outputs digital samples based on a modulated wireless signal, an interference canceller configured to filter the digital samples using a least mean squares algorithm to reduce narrowband interference, and a second DVGA configured to amplify the filtered digital samples. | 09-02-2010 |
| 20100246564 | METHODS AND SYSTEMS FOR TIMING ACQUISITION ROBUST TO CHANNEL FADING - The embodiments provide mechanisms for synchronizing a receiver with OFDM pilots that are robust in the presence of channel fading conditions. In addition to using instantaneous channel estimate values to locate the first arriving path and last arriving path, the methods calculate time-domain averaged channel estimate values and use those averaged values to determine an average first arriving path and last arriving path. A combination of the instantaneous first arriving path and last arriving path and the average first arriving path and last arriving path may then be used to determine the delay spread and calculate a timing offset to be applied in timing synchronization. The various embodiments introduce improvements under channel fading conditions. Time-domain averaging may be embodied in a flexible DSP processor, or implemented in hardware and/or software. Using both instantaneous and time-averaged channel estimates greatly improves the robustness of time synchronization under channel fading conditions. | 09-30-2010 |
| 20100316044 | TIMING SYNCHRONIZATION AND CHANNEL ESTIMATION AT A TRANSITION BETWEEN LOCAL AND WIDE AREA WAVEFORMS USING A DESIGNATED TDM PILOT - Systems and methods are provided for channel estimation and timing synchronization in a wireless network. In an embodiment, a method is provided for time synchronization at a wireless receiver. The method includes decoding at least one TDM pilot symbol located at a transition between wide and local waveforms and processing the TDM pilot symbol to perform time synchronization for a wireless receiver. Methods for channel estimation at a wireless receiver are also provided. This includes decoding at least one TDM pilot symbol and receiving the TDM pilot symbol from an OFDM broadcast to facilitate channel estimation for a wireless receiver. | 12-16-2010 |
| 20110058469 | WIDE AREA AND LOCAL NETWORK ID TRANSMISSION FOR COMMUNICATION SYSTEMS - The embodiments utilize OFDM symbols to communicate network IDs. The IDs are encoded into symbols utilizing the network IDs as seeds to scramble respective pilots that are then transmitted by utilizing the symbols. The pilots can be structured into a single OFDM symbol and/or multiple OFDM symbols. The single symbol structure for transmitting the network IDs is independent of the number of network ID bits and minimizes frequency offset and Doppler effects. The multiple symbol structure allows a much coarser timing accuracy to be employed at the expense of transmitting additional symbols. Several embodiments employ a search function to find possible network ID candidates from a transmitted symbol and a selection function to find an optimum candidate from a network ID candidate list. | 03-10-2011 |
| 20110080924 | METHOD FOR TRANSMISSION OF TIME DIVISION MULTIPLEXED PILOT SYMBOLS TO AID CHANNEL ESTIMATION, TIME SYNCHRONIZATION, AND AGC BOOTSTRAPPING IN A MULTICAST WIRELESS SYSTEM - Systems and methods are provided for the transmission of waveforms to aid channel estimation, timing synchronization, and AGC bootstrapping in a wireless network. The method includes inserting at least one TDM pilot symbol located at a transition between wide area and local area waveforms to facilitate decoding of the transmission block. | 04-07-2011 |
| 20110116396 | METHODS AND APPARATUS FOR TIME TRACKING USING ASSITANCE FROM TDM PILOTS IN A COMMUNICATION NETWORK - Methods and apparatus for time tracking using assistance from TDM pilots in a communication network. In an aspect, a method is provided for time tracking in a device operating on a communication network, wherein the device performs a time tracking algorithm. The method includes determining a delay spread, and modifying at least one parameter used by the time tracking algorithm based on the delay spread. In another aspect, an apparatus is provided for time tracking in a device operating on a communication network, wherein the device performs a time tracking algorithm. The apparatus includes computation logic for determining a delay spread, and control logic for modifying at least one parameter used by the time tracking algorithm based on the delay spread. | 05-19-2011 |
| 20110216678 | SYSTEM AND METHOD FOR THE SIMULTANEOUS RECEPTION OF FLO AND FLO-EV DATA - A system for receiving data includes a receiver configured to receive a radio frequency communication signal comprising at least one superframe, the at least one superframe having at least a first data stream and a second data stream encoded therein, wherein the receiver decodes at least one of the first data stream and the second data stream. | 09-08-2011 |
| 20110216745 | SYSTEM AND METHOD FOR SIGNALING OVERHEAD INFORMATION IN A NETWORK - A system for signaling overhead information in a network includes a receiver configured to receive a radio frequency communication signal comprising at least one superframe, the at least one superframe comprising overhead information that identifies a location of a first data stream carried in the at least one superframe, and a trailer associated with the first data stream, the trailer including at least a portion of the overhead information that identifies the location of the first data stream in a subsequent superframe without the receiver processing the overhead information in the subsequent superframe. | 09-08-2011 |
| 20120069934 | SYSTEM AND METHOD FOR REDUCING POWER CONSUMPTION IN A FLO-EV RECEIVER - A method for exiting receiver processing in a FLO-EV receiver comprises receiving a communication signal comprising at least one received symbol, deriving a channel performance metric based on the received symbol, determining whether the metric exceeds a threshold, and when the metric exceeds the threshold, providing a logic signal to signal receiver processing cessation. | 03-22-2012 |
| 20140023271 | Identifying A Maximally Stable Extremal Region (MSER) In An Image By Skipping Comparison Of Pixels In The Region - A difference in intensities of a pair of pixels in an image is repeatedly compared to a threshold, with the pair of pixels being separated by at least one pixel (“skipped pixel”). When the threshold is found to be exceeded, a selected position of a selected pixel in the pair, and at least one additional position adjacent to the selected position are added to a set of positions. The comparing and adding are performed multiple times to generate multiple such sets, each set identifying a region in the image, e.g. an MSER. Sets of positions, identifying regions whose attributes satisfy a test, are merged to obtain a merged set. Intensities of pixels identified in the merged set are used to generate binary values for the region, followed by classification of the region as text/non-text. Regions classified as text are supplied to an optical character recognition (OCR) system. | 01-23-2014 |
| 20140270344 | REDUCING OBJECT DETECTION TIME BY UTILIZING SPACE LOCALIZATION OF FEATURES - In one example, a method for exiting an object detection pipeline includes determining, while in the object detection pipeline, a number of features within a first tile of an image, wherein the image consists of a plurality of tiles, performing a matching procedure using at least a subset of the features within the first tile if the number of features within the first tile meets a threshold value, exiting the object detection pipeline if a result of the matching procedure indicates an object is recognized in the image, and presenting the result of the matching procedure. | 09-18-2014 |
| 20140363048 | INTERACTIVE AND AUTOMATIC 3-D OBJECT SCANNING METHOD FOR THE PURPOSE OF DATABASE CREATION - Systems, methods, and devices are described for capturing compact representations of three-dimensional objects suitable for offline object detection, and storing the compact representations as object representation in a database. One embodiment may include capturing frames of a scene, identifying points of interest from different key frames of the scene, using the points of interest to create associated three-dimensional key points, and storing key points associated with the object as an object representation in an object detection database. | 12-11-2014 |
