Patent application number | Description | Published |
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 |
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 |
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 |
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 |