Patent application number | Description | Published |
20110182277 | METHOD, APPARATUS AND SYSTEM OF SPATIAL DIVISION MULTIPLE ACCESS COMMUNICATION IN A WIRELESS LOCAL AREA NETWORK - Some demonstrative embodiments of the invention include a method, apparatus for concurrently transmitting data to two or more wireless stations. | 07-28-2011 |
20110210892 | METHOD FOR SINGLE STREAM BEAMFORMING WITH MIXED POWER CONSTRAINTS - System and method for calculating a transmitter beamforming vector related to a channel vector h under per-antenna power constraints combined with total power constraint, under per-antenna power constraints combined with overall line of site (LOS) effective isotropic radiated power (EIRP) and under all three constraints. Calculating a transmitter beamforming vector may be done in the transmitter, in the receiver and feedback to the transmitter or in both. The method may be adapted to perform with a multi-antenna receiver and with multi-carrier systems. | 09-01-2011 |
20110243208 | BACKOFF ADAPTATION FOR DIGITAL COMMUNICATION SYSTEMS WITH CHANNEL QUALITY INFORMATION - System and method for backoff correction of channel quality information (CQI). A correction factor is calculated based on a goodness measure such as packet error rate (PER). The selection of modulation and coding scheme (MCS) is made considering the channel quality information (CQI) adjusted by the correction factor. A meaningful goodness measure can be imposed if the goodness measure is very low. A different correction factor can be calculated for different confidence levels, MCSs and transmission modes. | 10-06-2011 |
20110273977 | SYSTEM AND METHOD FOR CHANNEL STATE RELATED FEEDBACK IN MULTI-USER MULTIPLE-INPUT-MULTIPLE-OUTPUT SYSTEMS - System and method for dimension reduction and for channel and interference condition feedback in a Multi-User Multiple-Input-Multiple-Output (MU MIMO) wireless communication systems. The method for dimension reduction includes determining a number of virtual antennas, v | 11-10-2011 |
20120063336 | SYSTEM AND METHOD FOR TUNING TRANSMISSION PARAMETERS IN MULTI-USER MULTIPLE-INPUT-MULTIPLE-OUTPUT SYSTEMS WITH AGED AND NOISY CHANNEL ESTIMATION - System and method for tuning transmission parameters based on estimated ratio between a signal to an estimated interference plus noise (SINR) of a user, in a multiple-user multiple-input multiple-output (MU-MIMO) communication system, the method including obtaining channel state information (CSI) related to a channel from an access point (AP) to users that participate in a next MU-MIMO transmission, wherein the AP, and the users pertain to the MU-MIMO communication system, obtaining error coefficients related to errors related to channel-ageing and to estimation noise of the CSI, and calculating the estimated SINR, wherein the estimated interference is related to power of the other users and to the estimated channel magnitude the user u, and to the error coefficients, wherein the estimated channel magnitude is derived from the CSI. | 03-15-2012 |
20120155401 | SYSTEM AND METHOD FOR ALLOWING MULTIPLE STATIONS IN A NETWORK TO USE MU-MIMO TRANSMIT BEAMFORMING - System and method for Multi-User (MU) Multiple-Input-Multiple-Output (MIMO) transmission, the method including assigning to an originator station in a MU-MIMO wireless communication network, said originator station separate from a primary beamformer of the MU-MIMO communication network, permission for MU group management, and performing MU-MIMO transmission by the originator station to a plurality of stations in the MU-MIMO communication network. | 06-21-2012 |
20120163356 | IMPLICIT BEAMFORMING USING PARTIAL CHANNEL STATE INFORMATION - A method for communication includes, in a first communication station, receiving from a second communication station via multiple antennas an input signal having a spectrum that occupies an initial set of spectral bins. An extended set of the spectral bins, which includes the initial set and one or more additional spectral bins, is defined. Based on the received input signal, respective beam steering matrices are computed for the spectral bins in the extended set, including the additional spectral bins. The output signal is generated over the extended set of the spectral bins, including the additional spectral bins, using the respective beam steering matrices. The output signal is transmitted from the first communication station via the multiple antennas. | 06-28-2012 |
20120214402 | PHY-LEVEL WIRELESS SECURITY - A method for communication includes generating one or more data streams for transmission to respective target receivers, and one or more jamming streams. At least one parameter, selected from a group of parameters consisting of power ratios for allocation to the jamming streams and Modulation and Coding Schemes (MCSs) for assigning to the data streams, is calculated based on a criterion that is set to reduce a probability of the data streams being decoded by at least one eavesdropping receiver. The data streams and the jamming streams are transmitted using an antenna array while applying the at least one parameter. | 08-23-2012 |
20120214403 | TIME-VARYING PHY-LEVEL WIRELESS SECURITY - A method for communication includes generating a data transmission including multiple successive parts in respective time intervals, for transmission to a target receiver. At least one jamming transmission is generated, having a configuration that varies over the respective time intervals corresponding to the parts of the data transmission, including at least first and second different configurations generated during respective first and second time intervals. The data transmission is transmitted to the target receiver using an antenna array, and the at least one jamming transmission is transmitted simultaneously using the antenna array. | 08-23-2012 |
20120214404 | MULTI-MODE PHY-LEVEL WIRELESS SECURITY - A method for communication includes, in a transmitter that transmits one or more data streams to respective target receivers and one or more jamming streams for preventing the data streams from being decoded by eavesdropping receivers, holding a definition of at least first and second transmission modes having respective, different first and second levels of security in preventing the data streams from being decoded by the eavesdropping receivers. One of the first and second transmission modes is selected for transmitting a data stream to a target receiver, by evaluating a selection criterion. The data stream and the jamming streams are transmitted via an antenna array using the selected transmission mode. | 08-23-2012 |
20120286996 | METHOD FOR SINGLE STREAM BEAMFORMING WITH MIXED POWER CONSTRAINTS - System and method for calculating a transmitter beamforming vector related to a channel vector h under per-antenna power constraints combined with total power constraint, under per-antenna power constraints combined with overall line of site (LOS) effective isotropic radiated power (EIRP) and under all three constraints. Calculating a transmitter beamforming vector may be done in the transmitter, in the receiver and feedback to the transmitter or in both. The method may be adapted to perform with a multi-antenna receiver and with multi-carrier systems. | 11-15-2012 |
20120315899 | DEVICE ROAMING IN HYBRID WI-FI/WIRELINE AND MULTI-AP NETWORKS - A method for communication includes communicating between a first transceiver and a wireless communication terminal on a first channel, while identifying the first transceiver to the terminal with a transceiver identity. A roaming condition, which determines whether the terminal is to roam to a second transceiver operating on a second channel, is evaluated. Upon meeting the roaming condition, the terminal is instructed to switch to the second channel, and the terminal is subsequently communicated with using the second transceiver on the second channel while identifying the second transceiver to the terminal with the same transceiver identity as the first transceiver. | 12-13-2012 |
20130003645 | REPEATER FOR ENHANCING PERFORMANCE OF A WIRELESS LAN NETWORK - System and method for enhancing performance of a wireless communication system, including communicating between an access point and at least one close client over a first RF channel, and communicating between an access point and at least one remote client via a repeater. The communication between the access point and the at least one remote client via the repeater includes communicating between an access point and the repeater over the first RF channel and communicating between the repeater and the at least one remote client over a second RF channel. The communication between the access point and the at least one close client over the first RF channel is substantially contemporaneous with the communication between the repeater and the at least one remote client over the second RF channel. | 01-03-2013 |
20130010719 | METHOD FOR MANAGING THE SPECTRUM OF A MULTI-BAND WIRELESS COMMUNICATION SYSTEM - System and method for managing the spectrum of a multi-channel wireless communication system. Information related to other channels and bands is exchanged between a client associated to a first channel of the multi-channel wireless communication system and a multi-channel access point. The information includes, inter alia, capabilities of the access point and the client, working channel information of the access point, link quality metrics of the client in the other bands etc. | 01-10-2013 |
20130034003 | CARRIER GROUPING SCHEMES FOR WIRELESS LOCAL AREA NETWORKS - A method in a receiver includes receiving from a transmitter a request to provide channel feedback relating to a communication channel between the transmitter and the receiver. A maximum latency after which the channel feedback is expected by the transmitter is assessed. A spectral resolution with which to calculate the channel feedback is selected based on the assessed maximum latency. The channel feedback is calculated with the selected spectral resolution, and the calculated channel feedback is sent to the transmitter within the maximum latency. | 02-07-2013 |
20130040580 | METHOD FOR SINGLE STREAM BEAMFORMING WITH MIXED POWER CONSTRAINTS - System and method for calculating a transmitter beamforming vector related to a channel vector h under per-antenna power constraints combined with total power constraint, under per-antenna power constraints combined with overall line of site (LOS) effective isotropic radiated power (EIRP) and under all three constraints. Calculating a transmitter beamforming vector may be done in the transmitter, in the receiver and feedback to the transmitter or in both. The method may be adapted to perform with a multi-antenna receiver and with multi-carrier systems. | 02-14-2013 |
20140161045 | BACKOFF ADAPTATION FOR DIGITAL COMMUNICATION SYSTEMS WITH CHANNEL QUALITY INFORMATION - System and method for backoff correction of channel quality information (CQI). A correction factor is calculated based on a goodness measure such as packet error rate (PER). The selection of modulation and coding scheme (MCS) is made considering the channel quality information (CQI) adjusted by the correction factor. A meaningful goodness measure can be imposed if the goodness measure is very low. A different correction factor can be calculated for different confidence levels, MCSs and transmission modes. | 06-12-2014 |
20140269554 | SELF-CALIBRATION TECHNIQUES FOR IMPLICIT BEAMFORMING - A method for communication includes, in a communication device that includes a plurality of transmission/reception (TX/RX) chains, each including a respective TX chain and a respective RX chain coupled to a respective antenna, transmitting a calibration signal via one or more TX chains and receiving the transmitted calibration signal via one or more RX chains. Calibration coefficients, which are indicative of offsets in response between the TX chains and the corresponding RX chains, are computed based on the received calibration signal. A self-calibrated beamformed signal is generated using the calibration coefficients. The self-calibrated beamformed signal is transmitted via the TX chains to a remote communication device. | 09-18-2014 |
20140269634 | PRIORITIZED AIRTIME-AWARE SCHEDULING FOR WIRELESS LOCAL-AREA NETWORK - A method for communication includes accepting in an Access Point (AP) data items for transmission over a wireless channel to multiple terminals served by the AP. Aggregate airtimes, which were previously allocated to the respective terminals on the wireless channel, are assessed. Transmission of the data items is scheduled depending on the aggregate airtimes. | 09-18-2014 |
20140269635 | AIRTIME-AWARE SCHEDULING FOR WIRELESS LOCAL-AREA NETWORK - A method for communication includes accepting in an Access Point (AP) data items for transmission over a wireless channel to multiple terminals served by the AP. Aggregate airtimes, which were previously allocated to the respective terminals on the wireless channel, are assessed. Transmission of the data items is scheduled depending on the aggregate airtimes. | 09-18-2014 |
20140294113 | METHOD FOR SINGLE STREAM BEAMFORMING WITH MIXED POWER CONSTRAINTS - System and method for calculating a transmitter beamforming vector related to a channel vector h under per-antenna power constraints combined with total power constraint, under per-antenna power constraints combined with overall line of site (LOS) effective isotropic radiated power (EIRP) and under all three constraints. Calculating a transmitter beamforming vector may be done in the transmitter, in the receiver and feedback to the transmitter or in both. The method may be adapted to perform with a multi-antenna receiver and with multi-carrier systems. | 10-02-2014 |
20140355532 | WLAN DEVICE WITH AUXILIARY RECEIVER CHAIN - A method includes, in a Wireless Local Area Network (WLAN) device, communicating on a given communication channel using one or more primary transmission/reception (TX/RX) chains. Concurrently with communicating on the given communication channel using the primary TX/RX chains, signal activity is evaluated on one or more alternative communication channels using an auxiliary reception (RX) chain whose hardware is partially shared with one of the primary TX/RX chains. | 12-04-2014 |