Patent application number | Description | Published |
20090185607 | METHOD FOR CHANNEL STATE FEEDBACK BY QUANTIZATION OF TIME-DOMAIN COEFFICIENTS - The present invention relates to a channel state transmission method using time domain coefficient quantization. A terminal measures channel information in the time domain and transmits it to a base station. In this instance, a multipath frequency selective fading channel is displayed in a tapped delay line format configured with a per-path path delay value and a path gain in the time domain, differentiates a quantization level for each path gain for more efficient transmission, quantizes the same, and transmits it to a transmitter. Therefore, while the amount of bandwidths required for transmitting state information from the terminal to the base station is reduced, the base station can efficiently acquire channel state information on the entire bandwidths. Also, the base station transmits signals to many terminals through beamforming by using the acquired reliable channel state information, thereby increasing the terminal's signal receiving performance. | 07-23-2009 |
20100040006 | VARIABLE COORDINATION PATTERN APPROACH FOR IMPROVING PERFORMANCE IN MULTI-CELL OR MULTI-ANTENNA ENVIRONMENTS - A method and apparatus is disclosed herein for verifying coordination patterns to improve performance in a multi-cell or multi-antenna environment. In one embodiment, the method comprises storing a set of predefined and different coordination patterns, where each coordination pattern specifies entities in the plurality of cells that are to coordinated together in their transmissions in each cluster of cells on different transmission resources defined for example in one or both time and frequency; and varying entities that coordinate with each other in their transmissions in each cluster of cells over transmission resources according to the predefined coordination patterns. | 02-18-2010 |
20100040163 | CHANNEL CLASSIFICATION AND RATE ADAPTATION FOR SU-MIMO SYSTEMS - A method, apparatus and system are disclosed herein for channel classification and adaptation. In one embodiment, the system comprises a base station having a transmitter that is operable to transmit wireless signals using a plurality of transmission options; and a user terminal having a receiver that is operable to receive and decode wireless signals using a plurality of receiver algorithms, where the user terminal is operable to receive communications from the transmitter over a multiple-input, multiple output (MIMO) channel, to select at least one coding mode to be used by the transmitter on the channel based on rates achievable using MIMO transmission, in view of the channel information, using different combinations of one of the plurality of receiver algorithms and one of the plurality of transmission options, and to send information to identify the at least one coding mode to the base station using a feedback channel, each coding mode specifying at least an encoder to be used by the transmitter for the channel. | 02-18-2010 |
20100041407 | METHOD OF COMBINED USER AND COORDINATION PATTERN SCHEDULING OVER VARYING ANTENNA AND BASE-STATION COORDINATION PATTERNS IN A MULTI-CELL ENVIRONMENT - A method and system is disclosed herein for scheduling in a multi-cell environment. In one embodiment, the system comprises a plurality of user terminals; a plurality of base stations to communicate with the plurality of user terminals, wherein the plurality of antennas from the base stations are grouped into coordination patterns that specify which antennas operate together as a cluster to coordinate transmissions with a subset of the plurality of user terminals, and further wherein defined pairs of the antenna sets and associated user sets vary over transmission resources based on coordination pattern changes such that different sets of antennas in the plurality of antennas are grouped together on different resources to coordinate transmissions to different subsets of users; and at least one controller to execute at least one scheduling algorithm to schedule transmissions with user terminals by specifying which user terminal to schedule for service by which sets of antennas and on which transmission resource and with what transmission rate. | 02-18-2010 |
20100041408 | METHOD FOR VARYING TRANSMIT POWER PATTERNS IN A MULTI-CELL ENVIRONMENT - A method and apparatus is disclosed herein for varying transmit power patterns in a multi-cell wireless transmission environment. In one embodiment, the method comprises varying transmit power coordination patterns for base stations in the wireless communication system to jointly vary base station power over a set of virtual channels over base stations within a cluster and across clusters of base stations; and jointly transmitting by groups of the base stations to one or more user terminals in their respective clusters based on the transmit power coordination patterns. | 02-18-2010 |
20100322327 | Method of estimating and removing noise in OFDM systems - The present invention relates to impulse noise estimation and removal in orthogonal frequency division multiplexing (OFDM) transmissions, and particularly to transmissions in power line communications and digital subscriber line (DSL) transmissions. The method includes the steps of: modulating data to be transmitted; performing an inverse fast Fourier transform; inserting a cyclic prefix into the data; transmitting the data as a set of OFDM symbols via a channel; receiving the set of OFDM symbols; removing the cyclic prefix; performing a fast Fourier transform; estimating impulse noise; canceling the impulse noise based upon the estimated impulse noise to produce a set of impulse noise-free data; estimating the channel; and demodulating and detecting the data transmitted based upon the estimated channel and the set of impulse noise-free data. | 12-23-2010 |
20110110449 | RECEIVER TERMINAL DRIVEN JOINT ENCODER AND DECODER MODE ADAPTATION FOR SU-MIMO SYSTEMS - A system, a method and an apparatus are disclosed herein for receiver terminal driven joint encoder and decoder mode adaptation for SU-MIMO transmission. In one embodiment, the system comprises a transmitter that is able to be directed to transmit wireless signals over a multiple-input, multiple output (MIMO) system using any of a plurality of encoding modes; and a user terminal having a receiver comprising a decoding module which has a plurality of decoding modes, each of which can be used to decode communications from the transmitter received over a multiple-input, multiple output (MIMO) channel, wherein at least one encoding mode is operable with multiple of the decoding modes. The system also comprises a joint selection module that is operable to select for the MIMO transmission the decoding mode from the plurality of decoding modes and an encoding mode from the plurality of encoding modes to be used by the transmitter on the channel, the selection being based on receiver-dependent criteria corresponding to the decoding mode associated with the encoding mode and channel information, receiver hardware and state, and application-specific constraints. The joint selection module is operable to send information to identify the encoding mode to the transmitter using a feedback channel. | 05-12-2011 |
20120039385 | SYSTEM AND METHOD FOR LOSSY SOURCE-CHANNEL CODING AT THE APPLICATION LAYER - A source channel encoder, source channel decoder and methods for implementing such devices are disclosed herein. The source channel encoder includes a linear transform encoder configured to generate a plurality of source components. A successive refinement quantizer is configured to generate a plurality of bit planes based on the source components. A systematic linear encoder configured to map the bit planes into channel-encoded symbols. The linear transform encoder may be configured to apply a Discrete Cosine Transform (DCT) or a Discrete Wavelet Transform (DWT). The linear transform encoder may be configured for differential encoding. | 02-16-2012 |
20120113953 | METHOD AND APPARATUS FOR THE JOINT DESIGN AND OPERATION OF SCHEDULING AND TRANSMISSION FOR DOWNLINK MULTI-USER MIMO WITH RECIPROCITY-BASED TRAINING - A method and apparatus is disclosed herein for scheduling and transmission for downlink multi-user MIMO (MU-MIMO). In one embodiment, the method comprises allocating a subset of time-frequency resources in the time-frequency plane to each distinct bin class, where each bin class comprises one or more bins of user terminals across the topology, and wherein user terminals in the one or more bins of each bin class are served across the topology by the subset of time-frequency resources. The method also comprises performing joint downlink MU-MIMO transmission using a plurality of bin class-dependent wireless transmission architectures at the plurality of base stations, where one or more bin classes is associated with one of the plurality of bin class-dependent architectures, and where each of the plurality of bin class-dependent architectures use different combinations of scheduling training and MU-MIMO transmission across the topology. | 05-10-2012 |
20130315211 | AIRSYNC: ENABLING DISTRIBUTED MULTIUSER MIMO WITH FULL MULTIPLEXING GAIN - Systems and methods are described that provide not only time but also phase synchronization, thus enabling distributed multiuser multiple-input multiple-output (MIMO) architectures and techniques, such as supported by the IEEE 802.11n standard, where several access points are connected to a central server and operate as a large distributed multi-antenna access point. The systems and methods can lock the phase of all access points using a common reference (e.g., a synchronization tone) broadcasted over the air in conjunction with a predictive filter (e.g., a Kalman filter) which closely tracks the phase drift for each subcarrier channel. | 11-28-2013 |
20140211779 | SCALABLE SYNCHRONIZATION FOR DISTRIBUTED MULTIUSER MIMO - Each wireless access point in a network may transmit pilot bursts; receive pilot bursts; determine the timing, carrier frequency, and/or sampling frequency of each received pilot burst; determine an offset between the timing, carrier frequency, and/or sampling frequency of each received pilot burst and its own transmitted signals; and deliver one or more of these determined offsets to a computer server. The computer server may receive these offsets and, based on them, compute and deliver to each wireless access point a timing, carrier frequency, and/or sampling frequency correction factor. Each wireless access point may adjust its transmitted timing, carrier frequency, and/or sampling frequency in accordance with these correction factors. | 07-31-2014 |
Patent application number | Description | Published |
20080208445 | ROUTE SHAPING SYSTEMS AND METHODS - Route shaping systems and methods determine a route from a current location through a shape location to a destination. An area of interest is determined for the shape location, and a highest road class for road segments through the interest area is identified. A route is calculated from a starting location through the interest area to the destination, and the route includes a selected road segment through the interest area with the highest road class. | 08-28-2008 |
20090018840 | AUTOMATED SPEECH RECOGNITION (ASR) TILING - Techniques are described related to tiles of automatic speech recognition data. In an implementation, automated speech recognition (ASR) data is obtained. The ASR data is divided into a plurality of tiles based on an approximate amount of data to be included in each tile. Each of the tiles is a geographic partition of the ASR data. | 01-15-2009 |
20090018842 | AUTOMATED SPEECH RECOGNITION (ASR) CONTEXT - Techniques are described to create a context for use in automated speech recognition. In an implementation, a determination is made as to which data received by a position-determining device is selectable to initiate one or more functions of the position-determining device, wherein at least one of the functions relates to position-determining functionality. A dynamic context is generated to include one or more phrases taken from the data based on the determination. An audio input is translated by the position-determining device using one or more said phrases from the dynamic context. | 01-15-2009 |
20090171665 | METHOD AND APPARATUS FOR CREATING AND MODIFYING NAVIGATION VOICE SYNTAX - Techniques are described for enabling flexible and dynamic creation and/or modification of voice data for a position-determining device. In some embodiments, a voice package is provided that includes a language database and a plurality of audio files. The language database specifies appropriate syntax and vocabulary for information that is intended for audio output by a position-determining device. The audio files include words and/or phrases that may be accessed by the position-determining device to communicate the information via audible output. Some embodiments utilize a voice package toolkit to construct and/or customize one or more parts of a voice package. | 07-02-2009 |
20090182562 | DYNAMIC USER INTERFACE FOR AUTOMATED SPEECH RECOGNITION - Techniques are described for generating a dynamic user interface for a position-determining device that may account for a variety of input modes. In one example, a position-determining device is initiated in a first input mode (e.g., a touch screen mode) and a graphical user interface (GUI) of the device is configured to accept input via the first input mode. The position-determining device then receives an indication to switch to a second input mode (e.g., a speech input mode) and the GUI is configured to receive input via the second input mode. The position-determining device can dynamically transition between GUI configurations based on a plurality of input modes. | 07-16-2009 |