Patent application number | Description | Published |
20080232501 | STATIC AND DIFFERENTIAL PRECODING CODEBOOK FOR MIMO SYSTEMS - Systems and methods are disclosed to generate a codebook for channel state information by generating a random codebook; partitioning channel state information into a set of nearest neighbors for each codebook entry based on a distance metric; and updating the codebook by finding a centroid for each partition. | 09-25-2008 |
20090274225 | MULTI-RESOLUTION PRECODING CODEBOOK - Systems and methods are for generating a codebook by: generating a multi-resolution codebook by selecting a common precoder index from a low resolution codebook for a group of adjacent resource blocks (RB)s and for each RB within the group, selecting a high-resolution codebook to fine-tune each RB precoder; and generating feedback for the multi-resolution codebook by quantizing channel state variations. | 11-05-2009 |
20100056059 | SYSTEMS AND METHODS FOR ADAPTIVE BEAMFORMING IN INDOOR WIRELESS NETWORKS - Systems and methods are disclosed for transmitting signals between a transmitter and a receiver by differentially estimating channel coefficients for each of the antenna elements relative to a reference antenna element; determining beam weights to remove oscillator induced phase or offset; and applying a correction (beamforming solution) at the transmitter to make the phase of the received signal from different antenna elements to be coherently combined at the receiver. | 03-04-2010 |
20100157924 | MU-MIMO-OFDMA SYSTEMS AND METHODS FOR SERVICING OVERLAPPING CO-SCHEDULED USERS - Methods and systems for conveying or transmitting to any given user in an OFDMA-MU-MIMO system scheduling information of other co-scheduled users to permit the user to perform error-correction on received data and/or interference reduction on its received signals. The scheduling information can include resource block assignment, modulation constellations employed, coding rates employed, power levels utilized and precoder matrix indices used. Further, the scheduling information can be conveyed in part through dedicated reference symbol layers or pilot streams. Moreover, a base station may transmit a preliminary estimate of the total number of users the base station expects to schedule, or an upper-bound on the total number of users, to the MU-MIMO users to permit the MU-MIMO users to determine preferred precoder matrix indices and indications of channel quality indices. | 06-24-2010 |
20110007757 | DETERMINISTIC ROTATIONAL CODING - A system and method for implementing a network encoding scheme includes buffering a signal in quantized form at a node of a network and permuting the signal into a particular order of code blocks. The code blocks are rotated using at least one key which has been assigned to the node, wherein the at least one assigned key is a value which is used to control the amount of rotation. The rotated code blocks are then combined to generate a combined signal. The combined signal is permuted back to generate at least one output signal. | 01-13-2011 |
20110134775 | Closed Loop Precoding Over a Set of Parallel Channels - Methods and apparatus are disclosed for applying successive multi-rank beamforming strategies (e.g., successive precoding strategies) for the design of precoders over a set of parallel channels. Successive beamforming is applied to a narrow band channel model and is also applied for finer quantization of a single beamforming vector (e.g., recursive beamforming). A first embodiment provides the optimal approach with high complexity. An alternative embodiment provides successive beamforming for near optimal precoding selection with medium complexity. A low complexity method for precoder selection is also provided wherein a channel representative matrix for the set of parallel channels is determined and successive beamforming on the calculated channel representative is applied. | 06-09-2011 |
20120057557 | Method and Systems for Conveying Scheduling Information of Overlapping Co-Scheduled Users in an OFDMA-MU-MIMO System - Methods and systems for conveying or transmitting to any given user in an OFDMA-MU-MIMO system scheduling information of other co-scheduled users to permit the user to perform error-correction on received data and/or interference reduction on its received signals. The scheduling information can include resource block assignment, modulation constellations employed, coding rates employed, power levels utilized and precoder matrix indices used. Further, the scheduling information can be conveyed in part through dedicated reference symbol layers or pilot streams. Moreover, a base station may transmit a preliminary estimate of the total number of users the base station expects to schedule, or an upper-bound on the total number of users, to the MU-MIMO users to permit the MU-MIMO users to determine preferred precoder matrix indices and indications of channel quality indices. | 03-08-2012 |
20120057558 | Method and Systems for Conveying Scheduling Information of Overlapping Co-Scheduled Users in an OFDMA-MU-MIMO System - Methods and systems for conveying or transmitting to any given user in an OFDMA-MU-MIMO system scheduling information of other co-scheduled users to permit the user to perform error-correction on received data and/or interference reduction on its received signals. The scheduling information can include resource block assignment, modulation constellations employed, coding rates employed, power levels utilized and precoder matrix indices used. Further, the scheduling information can be conveyed in part through dedicated reference symbol layers or pilot streams. Moreover, a base station may transmit a preliminary estimate of the total number of users the base station expects to schedule, or an upper-bound on the total number of users, to the MU-MIMO users to permit the MU-MIMO users to determine preferred precoder matrix indices and indications of channel quality indices. | 03-08-2012 |
20120224649 | MULTI-RESOLUTION PRECODING CODEBOOK - Systems and methods are for generating a codebook by: generating a multi-resolution codebook by selecting a common precoder index from a low resolution codebook for a group of adjacent resource blocks (RB)s and for each RB within the group, selecting a high-resolution codebook to fine-tune each RB precoder; and generating feedback for the multi-resolution codebook by quantizing channel state variations. | 09-06-2012 |
20120281662 | Scheduling Information of Overlapping Co-Scheduled Users in an OFDMA-MU-MIMO System - A user equipment (UE) used in a multi-user (MU)-multiple input multiple output (MIMO) orthogonal frequency division multiple access (OFDMA) system is disclosed. The UE includes a receiving unit to receive from a base station an indication of an estimate of or an upper-bound on the total number of MU-MIMO user equipments (|S|) that are scheduled on a sub-band by the base station, wherein the sub-band includes one or more resource units, a calculation unit to calculate channel quality based on the indication of the estimate of or the upper-bound on the total number of MU-MIMO user equipments, and a transmission unit to transmit to the base station an indication of the channel quality. Other methods and apparatuses also are disclosed. | 11-08-2012 |
20130039437 | Method of Precoding with a Codebook for a Wireless System - A quantized multi-rank beamforming scheme for multiple-antenna systems such as a multiple-input-multiple-output (MIMO) wireless downlink. User equipment (UE) estimates downlink channel and transmit power and determines rank and power allocations. A quantized beamforming matrix is then determined by the UE using successive beamforming. The UE also determines channel quality indices (CQI) which it feeds-back to the wireless downlink base station along with the index of the quantized beamforming matrix. The base station uses the CQI information to select a UE for scheduling of downlink transmission and the quantized beamforming matrix index received from the selected UE to beamform the downlink transmission to the UE. Base station overhead and is minimized while providing near-optimal performance given the constraints of a limited feed-back channel and computational complexity of the UE. | 02-14-2013 |
20130094453 | MULTI-RESOLUTION PRECODING CODEBOOK - Systems and methods are for generating a codebook by: generating a multi-resolution codebook by selecting a common precoder index from a low resolution codebook for a group of adjacent resource blocks (RB)s and for each RB within the group, selecting a high-resolution codebook to fine-tune each RB precoder; and generating feedback for the multi-resolution codebook by quantizing channel state variations. | 04-18-2013 |
20130230116 | MULTI-RESOLUTION PRECODING CODEBOOK - Systems and methods are for generating a codebook by: generating a multi-resolution codebook by selecting a common precoder index from a low resolution codebook for a group of adjacent resource blocks (RB)s and for each RB within the group, selecting a high-resolution codebook to fine-tune each RB precoder; and generating feedback for the multi-resolution codebook by quantizing channel state variations. | 09-05-2013 |
20130242926 | METHODS AND SYSTEMS FOR CONVEYING SCHEDULING INFORMATION OF OVERLAPPING CO-SCHEDULED USERS IN AN OFDMA-MU-MIMO SYSTEM - A method implemented in a base station for conveying scheduling information in an orthogonal frequency division multiple access (OFDMA) multi-user (MU)-multiple input multiple output (MIMO) system is disclosed. The method includes transmitting to a first user equipment (UE) the scheduling information including first scheduling information of the first UE and at least a portion of second scheduling information of at least one second UE, wherein the scheduling information includes a resource block (RB) assigned to the first UE, the number of streams, and an indication of one or more dedicated reference symbol (RS) layers assigned to the first UE. Other methods, systems, and apparatuses also are disclosed. | 09-19-2013 |
20130272440 | Transmission of an Information Sequence - A method implemented in a mobile communications system for data transmission is disclosed. The method includes selecting a set of parallel channels, determining transmission rank, and determining a precoding matrix of the transmission rank for the set of parallel channels, wherein the precoding matrix is formed by applying householder transformation to a vector to make a matrix and selecting one or more columns from the matrix. Other methods and apparatuses also are disclosed. | 10-17-2013 |
20140334567 | MULTI-RESOLUTION PRECODING CODEBOOK - A method implemented in a base station used in a wireless communications system is disclosed. The method includes receiving, from a mobile station, a low resolution precoder matrix index for a plurality of resource blocks (RBs), receiving, from the mobile station, a high resolution precoder matrix index for part of the plurality of RBs, and transmitting, to the mobile station, data precoded with a precoder matrix, wherein the precoder matrix is determined from a codebook according to the low resolution precoder matrix index and the high resolution precoder matrix index. Other methods, apparatuses, and systems also are disclosed. | 11-13-2014 |