Patent application number | Description | Published |
20080267304 | METHOD AND SYSTEM FOR JOINT TIME-OF-ARRIVAL AND AMPLITUDE ESTIMATION BASED ON A SUPER-RESOLUTION TECHNIQUE - In a geolocation application, a method is provided to jointly estimate the time-of-arrival (TOA) and the amplitude of a received signal based on super-resolution technique. The super-resolution joint TOA-amplitude estimators are provided based on either the expectation-maximization (EM), parallel-interference-cancellation space-alternating generalized expectation maximization (PIC-SAGE) or serial-interference-cancellation SAGE (SIC-SAGE). The SIC-SAGE estimator minimizes the ranging estimation error especially under a non-line-of-sight (NLOS) condition. The SIC-SAGE estimator is a simplified version of the maximum likelihood estimator with more stable performance in a multipath rich environment, such as the ultra-wideband (UWB) based applications. These techniques provide the following benefits: 1) it is generic, so that signal processing can be deployed on both time-domain (e.g., UWB impulse-radio) and frequency-domain (e.g., multi-band orthogonal frequency-division multiplexing (MB-OFDM)) based transceiver schemes and applicable for both UWB and non-UWB systems; 2) it is robust especially under NLOS condition and multipath rich environment. | 10-30-2008 |
20090019525 | DOMAIN-SPECIFIC LANGUAGE ABSTRACTIONS FOR SECURE SERVER-SIDE SCRIPTING - A method and apparatus is disclosed herein for secure server-side programming. In one embodiment, the method comprises creating a server-side program with one or more abstractions and compiling the server-side program by translating the server-side program, including the one or more abstractions, into target code that is guaranteed to execute in a secure manner with respect to a security criteria. | 01-15-2009 |
20090069029 | METHOD FOR AN IMPROVED LINEAR LEAST SQUARES ESTIMATION OF A MOBILE TERMINAL'S LOCATION UNDER LOS AND NLOS CONDITIONS AND USING MAP INFORMATION - A linear least squares (LLS) estimator provides a low complexity estimation of the location of a mobile terminal (MT), using one of the fixed terminals (FTs) as a reference FT to derive a linear model. A method for selecting a reference FT is disclosed, which improves the location accuracy relative to an arbitrary approach to selecting the reference FT. In addition, a covariance-matrix based LLS estimator is proposed in line-of-sight (LOS) and non-LOS (NLOS) environments to further provide accuracy, taking advantage of the correlation of the observations. Different techniques for selecting the reference FT under non-LOS (NLOS) conditions are disclosed. A map-based two-stage LLS estimator assists in selecting the reference FT under NLOS conditions. | 03-12-2009 |
20090070746 | METHOD FOR TEST SUITE REDUCTION THROUGH SYSTEM CALL COVERAGE CRITERION - A method and apparatus is disclosed herein for determining whether a test case is to be included in a test suite. In one embodiment, the method comprises executing an application with test inputs of a test case during performance of software application testing and using a Finite State Machine (FSM) model of observable events generated from execution of other test cases in the test suite to determine whether to include the test case in the test suite for use in future testing of the application. | 03-12-2009 |
20090116419 | METHOD AND SYSTEM OF THRESHOLD SELECTION FOR RELIABLE RELAY STATIONS GROUPING FOR DOWNLINK TRANSMISSION - A relaying selection and cooperative communications method provides a threshold selection criterion for forming a reliable group of relay stations (RSs) based on one or more design criteria. Possible design criteria include an outage probability constraint and a throughput constraint. The threshold value is selected according to, for example, transmission paths (e.g., line-of-sight, obstructed-light-of-sight, non-light-of-sight) or channel conditions (e.g., signal-to-noise-ratio) between the base station (BS) and the RSs (i.e., BS-RSs link) and between the RSs and the mobile station (MS) (i.e., RSs-MS link), respectively. | 05-07-2009 |
20090116422 | METHOD AND SYSTEM FOR OPPORTUNISTIC HYBRID RELAY SELECTION SCHEME FOR DOWNLINK TRANSMISSION - An opportunistic hybrid-relay selection scheme for downlink transmission selects between cooperative relay and single relay schemes based on the channel conditions (e.g., signal-to-noise-ratio (SNR)) between the base station (BS) and RSs (i.e., BS-RSs link) and RSs and mobile station (MS) (i.e., RSs-MS link), respectively. In another selection scheme, a selection between the single relay (e.g., best-relay) transmission scheme or the cooperative-relay transmission scheme may be determined based on transmission paths (e.g., line-of-sight, obstructed-light-of-sight, non-light-of-sight) and channel conditions (e.g., SNR) between the BS-RSs link and the RSs-MS link, respectively. | 05-07-2009 |
20090125976 | AUTOMATED TEST INPUT GENERATION FOR WEB APPLICATIONS - A method and apparatus is disclosed herein for automated test input generation for web applications. In one embodiment, the method comprises performing a source-to-source transformation of the program; performing interpretation on the program based on a set of test input values; symbolically executing the program; recording a symbolic constraint for each of one or more conditional expressions encountered during execution of the program, including analyzing a string operation in the program to identify one or more possible execution paths, and generating symbolic inputs representing values of variables in each of the conditional expressions as a numeric expression and a string constraint including generating constraints on string values by modeling string operations using finite state transducers (FSTs) and supplying values from the program's execution in place of intractable sub-expressions; and generating new inputs to drive the program during a subsequent iteration based on results of solving the recorded string constraints. | 05-14-2009 |
20090125977 | LANGUAGE FRAMEWORK AND INFRASTRUCTURE FOR SAFE AND COMPOSABLE APPLICATIONS - A method and apparatus is disclosed herein for using a language framework for composable programs. In one embodiment, the method comprises accessing active content having a software component embedded therein, where the software component has a plurality of components that together implement a work flow of a sequence of activities, the plurality of components representing one or more external services, one or more user interface controls and one or more inputs and output; executing the software component, including mediating communication between components using an information flow-based security model. | 05-14-2009 |
20090147872 | METHOD OF RANGING SIGNAL DESIGN AND TRANSMISSION FOR MIMO-OFDMA INITIAL RANGING PROCESS - A mobile communication system uses a multiple-input-multiple-output (MIMO) technology with an orthogonal frequency division multiplexing access (OFDMA) scheme. Multiuser diversity, multiantenna diversity, and power control since the first ranging attempt are exploited in the initial ranging process. At network entry, an initial ranging method selects from multiple ranging signal designs to accomplish the initial ranging process. In one embodiment, three classes of ranging signal designs may be selected for use in generating ranging codes. The information on the ranging signal design to be used, which is selected by the base station based on the cell size of the communication system (i.e., the radio coverage area of the base station), is broadcast from the BS. The ranging signal designs are directly applicable to single-antenna systems, and they are applied to MIMO systems by using appropriate mapping across transmit antennas based on the adopted MIMO ranging transmission scheme. In a mobile communication system using MIMO technology with the OFDMA scheme, the ranging user selects from multiple ranging transmission schemes of different levels of computation complexity, power consumption and performance. In one example, optimum eigenmode and suboptimum eigenmode transmission schemes provide the best performance at high computational complexity and high power consumption. A simpler single-antenna selection transmission scheme provides significantly reduces computational complexity and achieves power saving at a marginal degradation in system performance. | 06-11-2009 |
20090221266 | MOBILE TERMINAL, ACCESS CONTROL MANAGEMENT DEVICE, AND ACCESS CONTROL MANAGEMENT METHOD - A mobile terminal ( | 09-03-2009 |
20090285118 | PROXY TERMINAL, SERVICE DEVICE, PROXY TERMINAL COMMUNICATION PATH SETTING METHOD, AND SERVER DEVICE COMMUNICATION PATH SETTING METHOD - In a proxy terminal or server a path setting can be performed by a server apparatus and a path setting that includes, as a relay point, a proxy terminal arbitrarily specified by a user or the proxy terminal located in a local network to which the user belongs, without adding any function to a user terminal. The proxy terminal includes a terminal group information generator unit configured to generate terminal group information that includes a user terminal identifier and a proxy terminal network identifier as a pair, and to transmit, to a server apparatus, the generated terminal group information. | 11-19-2009 |
20090291690 | Femtocell Channel Assignment and Power Control for Improved Femtocell Coverage and Efficient Cell Search - A method and a communication system including femtocells within a macrocell efficiently manage interference between the different femtocells, and between each femtocell and a macrocell. An efficient frequency assignment scheme for the femtocells minimizes interference between a femtocell and a macrocell and among different femtocells using a spectrum-sensing technique carried out by the femtocells. The frequency assignment scheme selects a suitable channel from a set of candidate channels and ensures that the femtocell has an acceptable coverage area even when it is close to the macrocell base station (BS). The frequency assignment scheme favors a co-channel implementation to take advantage of the hand-off and cell search characteristics of the co-channel implementation. In one embodiment, a joint power control and frequency band assignment technique is used, which partitions the coverage area of the macrocell into an inner region, a power control region, and an outer region. Depending on a femtocell's location, it is assigned a certain power level and a frequency band. Power control may be used within the power-control region while, in the other regions, a fixed transmission power may be used. | 11-26-2009 |