Patent application number | Description | Published |
20080238717 | VARIABLE RATE ANALOG-TO-DIGITAL CONVERTER - According to various embodiments of the invention a variable rate analog-to-digital converter can be used in conjunction with an anti-aliasing filter to allow the use of lower sampling rates, and accordingly, generally lower power consumption. For example, a lower sampling rate can be used when it is determined that no undesirable signals are present and a higher sampling period can be used when an undesirable signal is present. Determining the presence of an undesired signal can be based on signal-to-noise ratio, over-sampling, bit error rate, using a detector, etc. An undesirable signal can be any signal that is close in frequency to a signal of interest or signals farther away in frequency that has a relatively high amplitude. Sampling rate can be varied in a binary fashion, stepwise, continuously, etc. | 10-02-2008 |
20080240112 | LAYER 2 ROUTING PROTOCOL | 10-02-2008 |
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 |
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 |
20080258973 | RANGING SIGNALS METHODS AND SYSTEMS - A system and method for estimating the range between two devices performs two or more ranging estimates with subsequent estimates performed using a clock that is offset in phase with respect to a prior estimate. The subsequent estimate allows estimate uncertainties due to a finite clock resolution to be reduced and can yield a range estimate with a higher degree of confidence. In one embodiment, these additional ranging estimates are performed at n/N (for n=1, . . . N−1, with N>1 and a positive integer) clock-period offset introduced in the device. The clock-period offset can be implemented using a number of approaches, and the effect of clock drift in the devices due to relative clock-frequency offset can also be determined. To eliminate the bias due to clock-frequency offset, a system and method to estimate the clock-frequency offset is also presented. | 10-23-2008 |
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 |
20090147709 | RECEIVER CHANNEL FEEDBACK THROUGH BEACONS - According to various embodiments a receiver may include information elements in its beacon. The information elements can then be used to send feedback information about packets received during the previous superframe(s). This feedback information may contain some acknowledgement information. For example, the feedback information may include information elements that include acknowledgement information that acknowledge the reception of previously transmitted packets. According to an embodiment of the invention, systems and methods to provide feedback information comprising receiving a packet; determining feedback information based on the received packet; and transmitting a beacon. The beacon comprises a frame header, including routing information for the frame; a beacon parameter, including signaling information; and an information element comprising the feedback information for the received packets. | 06-11-2009 |
20090168746 | INCREASE EFFECTIVE BEACON CAPACITY - According to an embodiment of the invention, systems and methods are provided to allow wireless network devices to transmit more data than the maximum length beacon during a beacon period. In some embodiments, the method includes transmitting an original beacon, determining if a beacon slot is available, selecting the available beacon slot; determining if the selected slot is within a beacon period of a neighbor, and transmitting an additional beacon. Other embodiments may include determining a different device address and EUI48 and selecting a new MAC information element for the additional beacon. | 07-02-2009 |
20100283682 | CLOCK PHASE RANGING METHODS AND SYSTEMS - A system and method for estimating the range between two devices performs two or more ranging estimates with subsequent estimates performed using a clock that is offset in phase with respect to a prior estimate. The subsequent estimate allows estimate uncertainties due to a finite clock resolution to be reduced and can yield a range estimate with a higher degree of confidence. In one embodiment, these additional ranging estimates are performed at n/N (for n=1, . . . N−1, with N>1 and a positive integer) clock-period offset introduced in the device. The clock-period offset can be implemented using a number of approaches, and the effect of clock drift in the devices due to relative clock-frequency offset can also be determined. To eliminate the bias due to clock-frequency offset, a system and method to estimate the clock-frequency offset is also presented. | 11-11-2010 |
20120089005 | Multi-Modal Medical Imaging and Type Detection - A multi-modal medical imaging and type detection have been described have been disclosed. By combining a broadband radio imaging system and one or more other modalities of image processing an enhanced image and/or tissue classification can be produced. | 04-12-2012 |