Patent application number | Description | Published |
20080240204 | METHOD AND SYSTEM FOR CHANNEL ESTIMATION - The present invention is directed to a system and method for channel estimation for a communication channel such as, for example, that found in a wireless communication network. One or more synchronization and channel estimate symbols can be combined to compute a refined channel estimate. | 10-02-2008 |
20080240261 | METHOD AND SYSTEM FOR CHANNEL ESTIMATION IN BURST MODE - The present invention is directed to a system and method for channel estimation for a communication channel such as, for example, that found in a wireless communication network. One or more channel estimates or channel observables can be combined to compute a refined channel estimate, for example, when the channel estimates or channel observables are from the same channel. | 10-02-2008 |
20080240264 | METHODS AND SYSTEMS FOR TRANSMITTING AND PROCESSING PILOT SIGNALS - A system and method of transmitting and processing pilot signals includes decorrelating a pilot tone that conveys a pilot signal, performing a channel estimation based on the decorrelated pilot tone to calculate estimated channel values and positioning the estimated channel values consistent with their order in subsequent transmission units. In one embodiment, the decorrelation comprises an interleaving operation. In another embodiment, the decorrelation occurs during a channel estimation stage. The decorrelation can be performed during a channel estimation stage by interleaving and deinterleaving pilot signals in the receiver. | 10-02-2008 |
20080247480 | METHODS AND SYSTEMS FOR DETECTING A NARROW-BAND INTERFERER - Various embodiments of the systems and methods described herein may be used to compute a minimum variance unbiased estimator by receiving a first OFDM signal at a pilot tone, receiving a second OFDM signal sent in the same frequency band and determining a differential phase metric between the first OFDM signal and the second OFDM signal. In some embodiments, the differential phase metric may be used to diversity combine synchronization statistics. In various embodiments, the differential phase metric may be used to detect a narrow-band interference. | 10-09-2008 |
20080247481 | METHODS AND SYSTEMS FOR COMPUTING A MINIMUM VARIANCE UNBIASED ESTIMATOR OF CARRIER AND SAMPLING CLOCK FREQUENCY - Various embodiments of the systems and methods described herein may be used to compute a minimum variance unbiased estimator by receiving a first OFDM signal at a pilot tone, receiving a second OFDM signal sent in the same frequency band and determining a differential phase metric between the first OFDM signal and the second OFDM signal. In some embodiments, the differential phase metric may be used to diversity combine synchronization statistics. In various embodiments, the differential phase metric may be used to detect a narrow-band interference. | 10-09-2008 |
20090067532 | METHODS AND SYSTEMS FOR DIVERSITY COMBINING OF SYNCHRONIZATION STATISTICS IN OFDM SYSTEMS - Various embodiments of the systems and methods described herein may be used to compute a minimum variance unbiased estimator by receiving a first OFDM signal at a pilot tone, receiving a second OFDM signal sent in the same frequency band and determining a differential phase metric between the first OFDM signal and the second OFDM signal. In some embodiments, the differential phase metric may be used to diversity combine synchronization statistics. In various embodiments, the differential phase metric may be used to detect a narrow-band interference. | 03-12-2009 |
20120307839 | METHOD FOR RECEIVING CHANNEL SELECTION INFORMATION - A master device selects a channel from a band of channels for communications with a slave device. The master transmits information identifying the selected to the slave device using a packet modulated as a series of energy pulses on the selected channel. The slave device performs wideband energy detection on the band of channels and receives the modulated pulses. The slave device decodes the modulated pulses to retrieve the selected channel, and tunes to the selected channel for further communications. | 12-06-2012 |
20130258486 | HEAD-MOUNT DISPLAY - A system and method is provided for varying the apparent distance of a virtual image projected by a head-mounted display. The distance between the user and an object being viewed by the user is determined. Then, the focal distance of an eyepiece optical system in the head-mounted display is adjusted to provide a virtual image at an apparent distance that corresponds to the determined distance. The user thereby experiences an approximately seamless overlay in sharp focus of the virtual image from the display and the three-dimensional binocular image being viewed. For example, when viewing a movie screen, or other object at infinity, the focal length is adjusted to provide a virtual image at or near optical infinity. Likewise, when reading a book, or inspecting another object in close proximity, the focal length is adjusted to provide the virtual image at a nearby apparent distance. | 10-03-2013 |
20130279548 | DIFFERENTIAL PHASE SHIFT KEYING SYSTEM AND METHOD - A variation on conventional DPSK binary modulation schemes is provided. One modulation scheme uses 3π/8 differential binary phase shift keying (3π/8-DBPSK) where one symbol is transmitted by phase change of 3π/8 radians and the other symbol is transmitted by phase change of −5π/8 radians. Alternatively, this can be thought of as adding a constant 3π/8 radians to the symbol angle for every bit modulated by conventional DBPSK. In another example, assume a first and second symbols, k−1 and k, respectively, are sent. Where k is the same symbol as k−1, a phase rotation of 3π/8 radians from the k | 10-24-2013 |
20140019828 | LOW-POWER TRANSMISSION SYSTEM - An efficient method and transceiver architecture combines elements to enable and facilitate the low power operation of a communications device; the combination of design elements, features, and functionalities are efficiently distributed among RF, APE, and baseband modules in order to exploit opportunities that can serve the goal of low or ultra low power consumption. | 01-16-2014 |