Patent application number | Description | Published |
20080240049 | SYSTEM AND METHOD FOR CONTROLLING THROUGHPUT OF ACCESS CLASSES IN A WLAN - A system comprises a monitoring module operative to monitor traffic on a wireless medium, the traffic belonging to one or more of two different access classes (ACs), one access class (AC) being a higher-priority AC and the other being a lower-priority AC; a throughput adaptation module communicatively coupled to the monitoring module and operative to dynamically generate data corresponding to one or more AC-sensitive parameters based on the monitored traffic and on a desired throughput ratio between the two different ACs; and a wireless communication module communicatively coupled to the throughput adaptation module and operative to communicate the data to one or more wireless stations on the wireless medium. | 10-02-2008 |
20080279140 | SYSTEM AND METHOD OF QOS-BASED CHANNEL SELECTION FOR WLAN ACCESS POINTS OR STATIONS - A system comprises a candidate channel assessment module for obtaining at least one AC-specific channel suitability metric for each of two different channels, and for using the AC-specific channel suitability metrics to determine a channel suitability index of each of the two different channels; a channel selection module for using the channel suitability index to select one of the two different channels as a new channel; and a channel setting module for configuring a wireless transceiver to use the new channel. | 11-13-2008 |
20090046613 | SYSTEM AND METHOD FOR MULTICAST/BROADCAST RELIABILITY ENHANCEMENT OVER WIRELESS LANs - A system comprises a communication engine for transmitting at least one groupcast packet to wireless stations on a wireless network; an ACK leader selection engine for identifying at least one of the wireless stations as a current ACK leader responsible for generating any ACK in response to the at least one groupcast packet, and for shifting the current ACK leader among a group of the wireless stations; and an ACK management engine for managing any ACK received from the current ACK leader. | 02-19-2009 |
20090109904 | SYSTEM AND METHOD FOR BURST CHANNEL ACCESS OVER WIRELESS LOCAL AREA NETWORKS - A system comprises a medium access engine operative to contend for access to a channel and to control transmission of data packets onto the channel on behalf of a particular data stream, the particular data stream belonging to a particular access class of a plurality of different access classes, the medium access engine operative to discriminate quality of service based on the different access classes; and a burst channel access engine operative to maintain a burst list of other data streams belonging to the particular access class and to control burst access to the channel based on the burst list on behalf of the particular data stream. | 04-30-2009 |
20090175251 | Multiple Wireless Local Area Networks For Reliable Video Streaming - A media center system comprises a first wireless controller operative to communicate with a first set of devices on a first WLAN using a first wireless standard; a first network processor coupled to the first wireless controller and operative to establish wireless communication over a first channel with the first set of devices on the first WLAN; a second wireless controller operative to communicate with a second set of devices on a second WLAN using a second wireless standard, the second wireless controller substantially dedicated for multimedia content delivery; and a second network processor coupled to the second wireless controller and operative to establish wireless communication over a second channel with the second set of devices on the second WLAN, the second channel being different than the first channel. | 07-09-2009 |
20100017530 | Priority-Based Physical Layer Transmission Rate Control For Video Streaming Over Wireless Networks - Priority-based physical layer transmission rate control for video streaming over wireless networks comprises receiving a video packet comprising at least part of a video frame. The video frame includes multiple slices, and each of the slices includes multiple macroblocks of a particular type. A current physical layer transmission bit rate is determined based at least in part on (1) a relative importance of the packet with respect to its impact on video quality and (2) a number of retransmissions of the packet at a previous physical layer transmission bit rate. The packet is transmitted at the current physical layer transmission bit rate. | 01-21-2010 |
20100232494 | FAST GENERALIZED DECISION FEEDBACK EQUALIZER PRECODER IMPLEMENTATION FOR MULTI-USER MULTIPLE-INPUT MULTIPLE-OUTPUT WIRELESS TRANSMISSION SYSTEMS - A technique is used to realize a generalized decision feedback equalizer (GDFE) Precoder for multi-user multiple-input multiple-output (MU-MIMO) systems, which significantly reduces the computational cost while resulting in no capacity loss. The technique is suitable for improving the performance of various MU-MIMO wireless systems including future 4G cellular networks. In one embodiment, a method for configuring a GDFE precoder in a base station of a MU-MIMO wireless system having k user terminals, each user terminal having associated therewith a feedforward filter. The method comprises computing a filter matrix C using one of a plurality of alternative formulas of the invention; and, based on the computation of the filter matrix C, computing a transmit filter matrix B for a transmit filter used to process a symbol vector obtained after a decision feedback equalizing stage of the GDFE precoder, a feedforward filter matrix F, and an interference pre-cancellation matrix G. | 09-16-2010 |
20110058598 | GENERALIZED DECISION FEEDBACK EQUALIZER PRECODER WITH INPUT COVARIANCE MATRIX CALCULATION FOR MULTI-USER MULTIPLE-INPUT MULTIPLE-OUTPUT WIRELESS TRANSMISSION SYSTEMS - To realize a GDFE precoder for multi-user MIMO systems, which significantly reduces the computational cost while resulting in no capacity loss, one method comprises computing an effective UL channel matrix H | 03-10-2011 |
20110058599 | GENERALIZED DECISION FEEDBACK EQUALIZER PRECODER WITH RECEIVER BEAMFORMING FOR MATRIX CALCULATIONS IN MULTI-USER MULTIPLE-INPUT MULTIPLE-OUTPUT WIRELESS TRANSMISSION SYSTEMS - To realize a GDFE precoder for multi-user MIMO systems, which significantly reduces the computational cost while resulting in no capacity loss, one method comprises obtaining an effective downlink (DL) channel matrix H for the DL channel after receiver processing at the user terminals; computing an uplink (UL) covariance matrix D by assuming there are as many user terminals as a number of rows in the effective DL channel matrix H; computing a filter matrix C based on the UL covariance matrix D; computing a feedforward filter matrix F based on the filter matrix C; computing an interference pre-cancellation matrix G, based on the feedforward filter matrix F and the filter matrix C, used in a transmitter at an interference pre-cancellation stage of the GDFE precoder; and processing user symbols by a decision feedback equalizing stage of the GDFE precoder to produce filtered vector symbols. | 03-10-2011 |
20110134865 | SYSTEM AND METHOD OF QOS-BASED CHANNEL SELECTION FOR WLAN ACCESS POINTS OR STATIONS - A system comprises a candidate channel assessment module for obtaining at least one AC-specific channel suitability metric for each of two different channels, and for using the AC-specific channel suitability metrics to determine a channel suitability index of each of the two different channels; a channel selection module for using the channel suitability index to select one of the two different channels as a new channel; and a channel setting module for configuring a wireless transceiver to use the new channel. | 06-09-2011 |
20110158151 | SYSTEM AND METHOD FOR MULTICAST/BROADCAST RELIABILITY ENHANCEMENT OVER WIRELESS LANs - A system comprises a communication engine for transmitting at least one groupcast packet to wireless stations on a wireless network; an ACK leader selection engine for identifying at least one of the wireless stations as a current ACK leader responsible for generating any ACK in response to the at least one groupcast packet, and for shifting the current ACK leader among a group of the wireless stations; and an ACK management engine for managing any ACK received from the current ACK leader. | 06-30-2011 |
20110231728 | PACKET ENCODING METHOD TO PROVIDE UNEQUAL ERROR PROTECTION TO USERS AND/OR APPLICATIONS DATA - Embodiments of the invention provide a packet encoding scheme to ensure unequal error protection to different bits in a packet or in multiple packets. In one embodiment, a method to process bits in a bit stream comprises scrambling the bit stream; separating the scrambled bit stream into a high priority bit stream with an order of high priority bits from left to right and a low priority bit stream with an order of low priority bits from left to right; rearranging the bits by embedding the high priority bits in the low priority bit stream while preserving the two orders, the rearranged bit stream including blocks of bits, each block including one or more high priority bits disposed left of corresponding one or more low priority bits to provide protection for the high priority bits against noise which is at least equal to protection for the low priority bits; and modulating the rearranged bit stream using Gray encoding method to produce an encoded bit stream. | 09-22-2011 |
20120011418 | PACKET ENCODING METHOD TO PROVIDE UNEQUAL ERROR PROTECTION TO USERS AND/OR APPLICATIONS DATA - Embodiments of the invention provide a packet encoding scheme to ensure unequal error protection to different bits in a packet or in multiple packets. In one embodiment, a method to process bits in a bit stream comprises scrambling the bit stream; separating the scrambled bit stream into a high priority bit stream with an order of high priority bits from left to right and a low priority bit stream with an order of low priority bits from left to right; rearranging the bits by embedding the high priority bits in the low priority bit stream while preserving the two orders, the rearranged bit stream including blocks of bits, each block including one or more high priority bits disposed left of corresponding one or more low priority bits to provide protection for the high priority bits against noise which is at least equal to protection for the low priority bits; and modulating the rearranged bit stream using Gray encoding method to produce an encoded bit stream. | 01-12-2012 |
20120082256 | TOMLINSON HARASHIMA PRECODING WITH ADDITIONAL RECEIVER PROCESSING IN A MULTI-USER MULTIPLE-INPUT MULTIPLE-OUTPUT WIRELESS TRANSMISSION SYSTEM - A method for processing user symbols with Tomlinson Harashima precoder (THP) in a base station, of a wireless system having K user terminals (UEs) which communicate with the base station via an uplink channel and corresponding downlink (DL) channel, comprises estimating a DL channel matrix H | 04-05-2012 |
20120201200 | FAST GENERALIZED DECISION FEEDBACK EQUALIZER PRECODER IMPLEMENTATION FOR MULTI-USER MULTIPLE-INPUT MULTIPLE-OUTPUT WIRELESS TRANSMISSION SYSTEMS - A technique is used to realize a generalized decision feedback equalizer (GDFE) Precoder for multi-user multiple-input multiple-output (MU-MIMO) systems, which significantly reduces the computational cost while resulting in no capacity loss. The technique is suitable for improving the performance of various MU-MIMO wireless systems including future 4G cellular networks. In one embodiment, a method for configuring a GDFE precoder in a base station of a MU-MIMO wireless system having k user terminals, each user terminal having associated therewith a feedforward filter. The method comprises computing a filter matrix C using one of a plurality of alternative formulas of the invention; and, based on the computation of the filter matrix C, computing a transmit filter matrix B for a transmit filter used to process a symbol vector obtained after a decision feedback equalizing stage of the GDFE precoder, a feedforward filter matrix F, and an interference pre-cancellation matrix G. | 08-09-2012 |
20130243109 | TOMLINSON HARASHIMA PRECODING WITH ADDITIONAL RECEIVER PROCESSING IN A MULTI-USER MULTIPLE-INPUT MULTIPLE-OUTPUT WIRELESS TRANSMISSION SYSTEM - A method for processing user symbols with Tomlinson Harashima precoder (THP) in a base station, of a wireless system having K user terminals (UEs) which communicate with the base station via an uplink channel and a corresponding downlink (DL) channel, comprises estimating DL channel matrix; determining receiver processing matrix; computing effective matrix DL channel H | 09-19-2013 |
20140029662 | FAST GENERALIZED DECISION FEEDBACK EQUALIZER PRECODER IMPLEMENTATION FOR MULTI-USER MULTIPLE-INPUT MULTIPLE-OUTPUT WIRELESS TRANSMISSION SYSTEMS - A technique is used to realize a generalized decision feedback equalizer (GDFE) Precoder for multi-user multiple-input multiple-output (MU-MIMO) systems, which significantly reduces the computational cost while resulting in no capacity loss. The technique is suitable for improving the performance of various MU-MIMO wireless systems including future 4G cellular networks. In one embodiment, a method for configuring a GDFE precoder in a base station of a MU-MIMO wireless system having k user terminals, each user terminal having associated therewith a feedforward filter. The method comprises computing a filter matrix C using one of a plurality of alternative formulas of the invention; and, based on the computation of the filter matrix C, computing a transmit filter matrix B for a transmit filter used to process a symbol vector obtained after a decision feedback equalizing stage of the GDFE precoder, a feedforward filter matrix F, and an interference pre-cancellation matrix G. | 01-30-2014 |