Patent application number | Description | Published |
20110022398 | METHOD AND APPARATUS FOR TRANSCODING AUDIO DATA - A method and apparatus for transcoding audio data. The method includes determining if AAC joint stereo exists, running a reference AC-3 rematrixing when the AAC joint stereo does not exist, when AAC joint stereo does exist, enabling rematrixing when the number of corresponding AAC bands is greater than half the size of the band, otherwise, running reference AC-3 rematrixing. | 01-27-2011 |
20110022999 | METHOD AND APPARATUS FOR LOW DELAY RECURSIVE FILTER DESIGN - A method and apparatus for low delay recursive filter design. The method includes determining a predefined filter template with higher magnitude specification than a target filter design, determining at least one relaxation bound on the filter specification utilizing the predefined filter template, specifying at least one constraint for the target filter design utilizing the at least one relaxation bound, and determining a low delay recursive filter design for minimizing the average group delay of the filter utilizing the at least one constraint. | 01-27-2011 |
20110096621 | SYSTEM AND METHOD FOR IMAGING - An imaging device is provided, comprising: a decorrelation circuit configured to receive K initial imaging signals and to perform a decorrelation operation on K initial imaging signals, respectively, to generate K decorrelated imaging signals; K | 04-28-2011 |
20110097006 | SYSTEM AND METHOD FOR IMAGING - An imaging device, is provided, comprising: a plurality of compression circuits configured to receive K initial imaging signals and to generate second through K | 04-28-2011 |
20110222791 | Post-Beamformer Ultrasound Compression - Embodiments of the invention compress ultrasound RF data after the receiver beamformer. An efficient compression algorithm is disclosed that incorporates the use of the Discrete Cosine Transform (DCT) and the Discrete Wavelet Packet (DWP) transform, followed by quantization of the wavelet coefficients. The algorithm first processes ultrasound scanlines from the receiver beamformer using a DCT transform. In a low-power configuration, a Hadamard transform may be used instead of the DCT. The output of the DCT processing is DCT coefficients at different frequencies. An optimized wavelet packet transform is then used for each coefficient line. The wavelet filter kernels and the wavelet packet trees can be jointly optimization using a two-step optimization algorithm. | 09-15-2011 |
20130300607 | WIRELESS LOCAL AREA NETWORK BASED POSITIONING - Apparatus and method for dynamically updating a channel model used for wireless local area network based positioning. In one embodiment, a wireless device includes a positioning system. The positioning system is configured to determine a position of the device based on signals received from wireless local area network access points. The positioning system is also configured to determine a likelihood that the wireless device is positioned at each of a plurality of points of a positioning grid based on a received signal strength value for each of a plurality of access points. The positioning system is further configured to update a reference power estimate for each access point based on the likelihoods. The positioning system is also configured to update the path loss exponent of the channel model. | 11-14-2013 |
20130303183 | SYSTEM AND METHOD FOR POSITIONING USING MAP-ASSISTED KALMAN FILTERING - Apparatus and method for positioning using map-assisted Kalman filtering. In one embodiment, a wireless device includes a positioning system configured to determine a position of the device based on wirelessly received positioning signals. The positioning system is configured to compute, via a Kalman filter, an initial location of the wireless device. The positioning system is also configured to determine whether the initial location is within a polygon defining a prohibited geographic area. The positioning system is further configured to identify an edge of the polygon nearest the initial location, based on the initial location being determined to be within the polygon. The positioning system is yet further configured to provide information defining the edge of the polygon to the Kalman filter as a measurement for use in computing a final position of the wireless device. | 11-14-2013 |
20140079162 | METHODS FOR ASSIGNING CODEWOODS TO POINTS IN HEXAGONAL CONSTELLATIONS IN DIGITAL COMMUNICATION SYSTEMS - Embodiments of the invention provide a method of decoding of hexagonal constellations. The decoding methods exploit the inherent structure of the hexagonal grid to eliminate/minimize the requirements for distance computations. A constellation which has unused constellation points is received. A plurality of lookup tables is used for indicating whether a particular constellation point is used. The lookup tables are indexed using the two integers u and v. An initial estimate of u and v is found. The euclidean distance to an immediate four neighbors resulting in the immediate upper and lower integers for ū and | 03-20-2014 |
20140171108 | DYNAMIC ACCESS POINT BASED POSITIONING - A wireless device that includes an access point (AP) scanner, a transceiver, and a controller coupled to the AP scanner and transceiver. The AP scanner is configured to scan wireless network channels utilized by one or more APs to transmit data packets, probe responses, and beacons. The transceiver is configured to transmit one or more probe requests to the one or more APs and receive one or more probe responses and beacons from the one or more APs. The controller is configured to determine a proximate geographic position of the wireless device based on signal strength of the one or more probe responses and beacons received from the one or more APs. The controller also dynamically adapts a parameter utilized in determining the proximate geographic position of the wireless device. | 06-19-2014 |
20140177740 | HEXAGONAL CONSTELLATIONS AND DECODING SAME IN DIGITAL COMMUNICATION SYSTEMS - Embodiments of the invention provide a method of decoding of hexagonal constellations. The decoding methods exploit the inherent structure of the hexagonal grid to eliminate/minimize the requirements for distance computations. A constellation which has unused constellation points is received. A plurality of lookup tables is used for indicating whether a particular constellation point is used. The lookup tables are indexed using the two integers u and v. An initial estimate ū and | 06-26-2014 |
20140185472 | METHOD FOR INCORPORATING INVISIBLE ACCESS POINTS FOR RSSI-BASED INDOOR POSITIONING APPLICATIONS - A method for incorporating invisible APs for RSSI based indoor positioning is presented. An empirical estimate of the probability of invisible APs versus distance is computed. An estimated position of the receiver can be computed using any statistical estimator based on the probability. In one embodiment, an estimate of the probability is computed by combining the probability over a set of visible APs and the probability over a set of invisible APs with the probability of individual contribution. In one embodiment a dynamic procedure is used to update the invisible probability that is computed using an AP dictionary built on the fly as new APs are detected. Incorporating invisible APs for estimating user position from the RSSI measurements for indoor positioning provides a better positioning accuracy as compared to typical estimators which rely only on the visible APs. | 07-03-2014 |
20140362701 | NLOS WIRELESS BACKHAUL DOWNLINK COMMUNICATION - A method for communicating over a wireless backhaul channel comprising generating a radio frame comprising a plurality of time slots, wherein each time slot comprises a plurality of symbols in time and a plurality of sub-carriers in a system bandwidth, broadcasting a broadcast channel signal comprising a transmission schedule to a plurality of remote units in a number of consecutive sub-carriers centered about a direct current (DC) sub-carrier in at least one of the time slots in the radio frame regardless of the system bandwidth, and transmitting a downlink (DL) control channel signal and a DL data channel signal to a first of the remote units, wherein the DL data channel signal is transmitted by employing a single carrier block transmission scheme comprising a Discrete Fourier Transform (DFT) spreading for frequency diversity. | 12-11-2014 |
20140365848 | NLOS WIRELESS BACKHAUL UPLINK COMMUNICATION - A method for uplink (UL) wireless backhaul communication at a wireless backhaul remote unit in a radio access network comprising receiving a configuration for radio frames and a transmission schedule through a downlink (DL) physical layer broadcast channel, wherein the transmission schedule comprises a transmission allocation for the remote unit, generating a UL data frame, wherein generating the UL data frame comprises performing forward error correction (FEC) encoding on a data bit stream to generate a plurality of FEC codewords, wherein performing the FEC encoding comprises performing Reed Solomon (RS) encoding on the data bit stream to generate a plurality of RS codewords, performing byte interleaving on the RS codewords, and performing Turbo encoding on the byte interleaved RS codewords to generate one or more Turbo codewords, wherein each Turbo codeword is encoded from more than one RS codeword, and transmitting the UL data frame according to the transmission allocation. | 12-11-2014 |
20140368386 | KALMAN FILTER FOR INDOOR POSITIONING - A position estimation method for indoor positioning includes filtering an initial position estimate that includes a corresponding covariance that reflects the quality of the geometry of the reference points and a previous initial position estimate that includes a corresponding covariance that reflects the quality of the geometry of the reference points by a Kalman filter to generate an updated previous position estimate, analyzing the updated previous position estimate to determine if the value is outside of a range, and constraining the updated previous position estimate based on the value being outside of the range. | 12-18-2014 |
20150031387 | COMPENSATION OF THE SIGNAL ATTENUATION BY HUMAN BODY IN INDOOR WI-FI POSITIONING - A mobile wireless device that includes a positioning system to determine a position of the mobile wireless device and to compensate a received signal strength indicator (RSSI) signal received from an access point (AP) when there is a line-of-sight (LOS) channel and the positioning system determines the body of the user of the mobile wireless device is attenuating the received RSSI signal due to the user's body being between the mobile wireless device and the AP. | 01-29-2015 |