Patent application number | Description | Published |
20080219388 | SUCCESSIVE INTERFERENCE CANCELLATION BASED ON THE NUMBER OF RETRANSMISSIONS - A method for processing a plurality of symbol streams is provided. The method includes receiving a first symbol stream, wherein the first symbol stream has a corresponding first number of retransmissions. The method further includes receiving a second symbol stream, wherein the second symbol stream has a corresponding second number of retransmissions. The method further includes selecting the first symbol stream for decoding, if the first number of retransmissions is greater than the second number of retransmissions. | 09-11-2008 |
20080225960 | Generalized reference signaling scheme for MU-MIMO using arbitrarily precoded reference signals - A multi-user MIMO downlink beamforming system ( | 09-18-2008 |
20080227495 | Reference signaling scheme using compressed feedforward codebooks for MU-MIMO systems - A multi-user MIMO downlink beamforming system with limited feed forward ( | 09-18-2008 |
20080229177 | Channel quality index feedback reduction for broadband systems - A system and methodology are disclosed for exploiting channel correlation in time and/or frequency to reduce CQI feedback in wireless communications systems. By compressing CQI feedback at the receiver to reduce redundancy in CQI feedback information that results from the channel correlation, the average feedback rate is reduced. In various embodiments, redundancy in time may be removed from the CQI feedback by monitoring variations of the CQI information in time at the receiver so that CQI information for a given CQI reporting instance is communicated to the transmitter only if it differs from the CQI information for the previous CQI reporting instance. Otherwise, no feedback is performed. In other embodiments, CQI feedback is compressed by performing a discrete cosine transform (DCT) on the CQI data. The compressed CQI feedback information is then communicated to the transmitter through the feedback control channel where it is decoded into the original CQI information and used to generate signal processing information for various sub-carriers. | 09-18-2008 |
20080233964 | Uplink control channel allocation - Various methods of allocating uplink control channels in a communication system are implemented at a resource scheduler or a user equipment (UE). In one method the scheduler reserves resources for a downlink data channel and signals a corresponding downlink data channel grant and also reserves resources for a persistent uplink control channel for a longer duration than the data channel grant. Signaling overhead associated with a grant for this persistent uplink control channel is reduced over a full dynamic grant. A predetermined rule can be used at the scheduler and at the UE to avoid overhead signaling associated with a grant for this persistent control channel. Predetermined rules at the UE and scheduler can also be used to reserve appropriate resources and select appropriate MCS levels for control information and the control information and uplink data can be transported over a common uplink channel when a time overlap occurs between an uplink data channel and the persistent control channel. | 09-25-2008 |
20080267057 | System and method for resource block-specific control signaling - A system and method is disclosed for resource block-specific control signaling in a communication system. Communication data is transmitted using a transmission channel comprising a plurality of resource blocks defined by allocating time-frequency slots in a transmission resource. Resource block control information is transmitted in a “feed-forward” manner to a user end (UE) or group of UEs using channels physically mapped into scheduled resource blocks (RBs) for that user or group of users. Embodiments of the invention provide an RB-specific control channel that comprises RB control elements that are embedded within scheduled resource blocks. The invention, therefore, reduces the amount of control information that must be transmitted by common or shared control channels. | 10-30-2008 |
20080268785 | UE-autonomous CFI reporting - In a closed-loop wireless communication system ( | 10-30-2008 |
20080318579 | Techniques for Resource Block Mapping in a Wireless Communication System - A technique of operating a wireless communication device includes creating a resource block map by associating respective subscriber station identifications, corresponding to respective subscriber stations, with one or more resource blocks. The respective subscriber station identifications and the resource block map are transmitted, from a serving base station, in one or more control channel symbols. | 12-25-2008 |
20090034636 | Feedback scheduling to reduce feedback rates in MIMO systems - In a closed-loop wireless communication system, a codebook-based feedback control mechanism is provided where feedback from each of a plurality of receivers is scheduled to control the feedback so that the receiving devices do not needlessly feed back precoding information to the transmitting device. The feedback may be controlled by establishing and distributing a schedule to control when each receiver feeds back preceding information, or by establishing and distributing a metric-based feedback threshold that must be satisfied before feedback is permitted. | 02-05-2009 |
20090046788 | Techniques for Reducing Precoding Overhead in a Multiple-Input Multiple-Output Wireless Communication System - A technique of operating a wireless communication device in a multiple-input multiple-output wireless communication system includes receiving, at a first wireless communication device, recommended precoder information from a second wireless communication device, which is associated with a recommended precoder. A precoded signal is then formed at the first wireless communication device based on the recommended precoder or an alternate precoder. The first wireless communication device, which is configured to not provide an indication of whether the recommended precoder or the alternate precoder was utilized to form the precoded signal, then transmits the precoded signal. | 02-19-2009 |
20090181691 | Channel Rank Feedback in Multiple-Input Multiple-Output Commnication Systems - Embodiments of a system and methodology are disclosed for aperiodic (i.e., non-periodic) feedback of channel-side information, such as channel rank information, to a base station by having the receiver/UE initiate the feedback instead of using a scheduled feedback approach. The autonomous feedback of channel-side information may use one of several different types of physical channel structures for uplink scheduling requests, such as those being discussed for inclusion in the emerging LTE platform standard. | 07-16-2009 |
20090190688 | Beamforming for Non-Collaborative, Space Division Multiple Access Systems - A wireless communication system noncollaborative, multiple input, multiple output (MIMO) space division multiple access (SDMA) system determines subscriber station combining and weighting vectors that yield a high average signal-to-interference plus noise ratio (SINR). Each subscriber station independently transmits information to a base station that allows the base station to determine a weight vector w | 07-30-2009 |
20090201861 | Method for Efficient CQI Feedback - In a closed-loop wireless communication system ( | 08-13-2009 |
20090304109 | Retransmission method for HARQ in MIMO systems - In a closed-loop wireless communication system ( | 12-10-2009 |
20090327835 | Techniques for Reducing Joint Detection Complexity in a Channel-Coded Multiple-Input Multiple-Output Communication System - A technique for joint detection of channel-coded signals in a multiple-input multiple-output system includes detecting, when a decoded signal associated with a first symbol stream passes a cyclic redundancy check, channel-coded signals in the first symbol stream and a second symbol stream using minimum mean squared error with ordered successive interference cancellation (MMSE-OSIC) based detection. When the decoded signal associated with the first symbol stream fails the cyclic redundancy check, the channel-coded signals in the first and second symbol streams are detected using neighbor search algorithm (NSA) based detection. | 12-31-2009 |
20100115358 | Method for Efficient Control Signaling of Two Codeword to One Codeword Transmission - In a wireless communication system ( | 05-06-2010 |
20100202553 | MIMO Precoding Enabling Spatial Multiplexing, Power Allocation and Adaptive Modulation and Coding - In a closed-loop wireless communication system, a codebook-based feedback mechanism is provided to enable non-unitary precoding for multi-stream transmission, where in each stream is optimized with suitable transmission power allocation and AMC. The codebook-based feedback mechanism uses a precoding codebook having a power allocation matrix which is constrained to specify that beamforming always applies full power to a predetermined beam. With this constraint, a one-bit power allocation feedback index may be used to switch between beamforming and spatial multiplexing. | 08-12-2010 |
20110009148 | Channel Rank Updates in Multiple-Input Multiple-Output Communication Systems - Embodiments of the disclosure provide a system and method for providing channel feedback information (CFI) from a user equipment device to a base station. CFI is transmitted from the user equipment device on first and second communication channels. The user equipment device is operable to measure the channel rank of a downlink channel and to select a preferred channel rank that is used to configure the CFI that is transmitted to the base station. The base station is operable to use the preferred channel rank to interpret the CFI transmitted by the user end device. | 01-13-2011 |
20110019631 | Generalized Reference Signaling Scheme for MU-MIMO Using Arbitrarily Precoded Reference Signals - A multi-user MIMO downlink beamforming system ( | 01-27-2011 |
20120076032 | MULTI-USER MIMO-SDMA FOR FINITE RATE FEEDBACK SYSTEMS - A multi-user v downlink beamforming system with limited feedback ( | 03-29-2012 |
20120076033 | METHODS FOR OPPORTUNISTIC MULTI-USER BEAMFORMING IN COLLABORATIVE MIMO-SDMA - A system and method for opportunistically designing collaborative beamforming vectors is disclosed for a wireless multiple input, multiple output (MIMO) space division multiple access (SDMA) communication system by sequentially designing beamforming vectors for ranked channels in order to exploit the instantaneous channel conditions to improve per user average SNR performance. Each subscriber station independently transmits information to a base station that allows the base station to determine beamforming vectors for each subscriber station by ranking the subscriber stations by channel strength. Using sequential nullspace methods, the ranked channel matrices are then used to select the channel matrix H | 03-29-2012 |
20120114064 | Reference Signaling Scheme Using Compressed Feedforward Codebooks for MU-MIMO Systems - A multi-user MIMO downlink beamforming system with limited feed forward ( | 05-10-2012 |
20120120823 | CHANNEL QUALITY INDEX FEEDBACK REDUCTION FOR BROADBAND SYSTEMS - Systems and methodology for exploiting channel correlation in time and/or frequency to reduce CQI feedback in wireless communications systems. By compressing CQI feedback at the receiver to reduce redundancy in CQI feedback information that results from the channel correlation, the average feedback rate is reduced. In various embodiments, redundancy in time may be removed from the CQI feedback by monitoring variations of the CQI information in time at the receiver so that CQI information for a given CQI reporting instance is communicated to the transmitter only if it differs from the CQI information for the previous CQI reporting instance. Otherwise, no feedback is performed. In other embodiments, CQI feedback is compressed by performing a discrete cosine transform (DCT) on the CQI data. | 05-17-2012 |
20120128044 | METHOD AND DEVICE FOR OPERATING A PRECODED MIMO SYSTEM - A method is provided for generating precoder data ( | 05-24-2012 |
20120257594 | TECHNIQUES FOR RESOURCE BLOCK MAPPING IN A WIRELESS COMMUNICATION SYSTEM - A technique of operating a wireless communication device includes creating a resource block map by associating respective subscriber station identifications, corresponding to respective subscriber stations, with one or more resource blocks. The respective subscriber station identifications and the resource block map are transmitted, from a serving base station, in one or more control channel symbols. | 10-11-2012 |
20120314654 | MULTIPLE INPUT MULTIPLE OUTPUT (MU-MIMO) APPARATUS AND METHODS - A multi-user MIMO downlink beamforming system ( | 12-13-2012 |
20130016763 | BEAMFORMING FOR NON-COLLABORATIVE, SPACE DIVISION MULTIPLE ACCESS SYSTEMS - A wireless communication system noncollaborative, multiple input, multiple output (MIMO) space division multiple access (SDMA) system determines subscriber station combining and weighting vectors that yield a high average signal-to-interference plus noise ratio (SINR). Each subscriber station independently transmits information to a base station that allows the base station to determine a weight vector w | 01-17-2013 |
20130022144 | MIMO PRECODING ENABLING SPATIAL MULTIPLEXING, POWER ALLOCATION AND ADAPTIVE MODULATION AND CODING - In a closed-loop wireless communication system, a codebook-based feedback mechanism is provided to enable non-unitary precoding for multi-stream transmission, where in each stream is optimized with suitable transmission power allocation and AMC. The codebook-based feedback mechanism uses a precoding codebook having a power allocation matrix which is constrained to specify that beamforming always applies full power to a predetermined beam. With this constraint, a one-bit power allocation feedback index may be used to switch between beamforming and spatial multiplexing. | 01-24-2013 |
20130036338 | METHOD FOR EFFICIENT CONTROL SIGNALING OF TWO CODEWORD TO ONE CODEWORD TRANSMISSION - In a wireless communication system ( | 02-07-2013 |
20130044714 | CHANNEL RANK FEEDBACK IN MULTIPLE-INPUT MULTIPLE-OUTPUT COMMUNICATION SYSTEMS - Embodiments of a system and methodology are disclosed for aperiodic (i.e., non-periodic) feedback of channel-side information, such as channel rank information, to a base station by having the receiver/UE initiate the feedback instead of using a scheduled feedback approach. The autonomous feedback of channel-side information may use one of several different types of physical channel structures for uplink scheduling requests, such as those being discussed for inclusion in the emerging LTE platform standard. | 02-21-2013 |
20130077703 | RETRANSMISSION METHOD FOR HARQ IN MIMO SYSTEMS - In a closed-loop wireless communication system ( | 03-28-2013 |
20130163517 | METHODS FOR OPTIMAL COLLABORATIVE MIMO-SDMA - A system and method for collaboratively designing optimized beamforming vectors is disclosed for a wireless multiple input, multiple output (MIMO) space division multiple access (SDMA) communication system to optimize an aggregate SNR performance metric across the different users, thereby permitting the flexibility to trade off computational requirements and size of control information exchanged with performance. Using adaptive vector space search methods, the space of all receive beamformers is searched to find the set which maximizes either the sum or product of SNRs of the users. | 06-27-2013 |
20130230006 | CHANNEL QUALITY INDEX FEEDBACK REDUCTION FOR BROADBAND SYSTEMS - A system and methodology are disclosed for exploiting channel correlation in time and/or frequency to reduce CQI feedback in wireless communications systems. By compressing CQI feedback at the receiver to reduce redundancy in CQI feedback information that results from the channel correlation, the average feedback rate is reduced. In various embodiments, redundancy in time may be removed from the CQI feedback by monitoring variations of the CQI information in time at the receiver so that CQI information for a given CQI reporting instance is communicated to the transmitter only if it differs from the CQI information for the previous CQI reporting instance. Otherwise, no feedback is performed. In other embodiments, CQI feedback is compressed by performing a discrete cosine transform (DCT) on the CQI data. The compressed CQI feedback information is then communicated to the transmitter through the feedback control channel where it is decoded into the original CQI information and used to generate signal processing information for various sub-carriers. | 09-05-2013 |
20130308528 | USER EQUIPMENT BUFFER MANAGEMENT IN MULTIPLE-INPUT MULTIPLE-OUTPUT COMMUNICATION SYSTEMS - Embodiments of the disclosure provide a system and method for dynamically allocating storage capacity in a user equipment buffer. In various embodiments of the invention, a plurality of transport blocks associated with a process are stored in a plurality of subpartitions of a partition of a buffer in a user equipment device. | 11-21-2013 |
20140044215 | Block-Based Crest Factor Reduction - A method and apparatus for a radio base station ( | 02-13-2014 |
20140050195 | System and Method for Resource Block-Specific Control Signaling - A system and method is disclosed for resource block-specific control signaling in a communication system. Communication data is transmitted using a transmission channel comprising a plurality of resource blocks defined by allocating time-frequency slots in a transmission resource. Resource block control information is transmitted in a “feed-forward” manner to a user end (UE) or group of UEs using channels physically mapped into scheduled resource blocks (RBs) for that user or group of users. Embodiments of the invention provide an RB-specific control channel that comprises RB control elements that are embedded within scheduled resource blocks. The invention, therefore, reduces the amount of control information that must be transmitted by common or shared control channels. | 02-20-2014 |
20140050274 | Generalized Reference Signaling Scheme for Multi-User Multiple Input, Multiple Output (MU-MIMO) using Arbitrarily Precoded Reference Signals - A multi-user MIMO downlink beamforming system is provided to enable transmit beamforming vectors to be efficiently provided to a subset of user equipment devices, where spatial separation or zero-forcing transmit beamformers (w | 02-20-2014 |
20140050275 | Reference Signaling Scheme using Compressed Feedforward Codebooks for MU-MIMO Systems - A multi-user MIMO downlink beamforming system with limited feed forward ( | 02-20-2014 |
20140079005 | Uplink Control Channel Allocation in a Communication System and Communicating the Allocation - Various methods of allocating uplink control channels in a communication system are implemented at a resource scheduler or a user equipment (UE). In one method the scheduler reserves resources for a downlink data channel and signals a corresponding downlink data channel grant and also reserves resources for a persistent uplink control channel for a longer duration than the data channel grant. Signaling overhead associated with a grant for this persistent uplink control channel is reduced over a full dynamic grant. A predetermined rule can be used at the scheduler and at the UE to avoid overhead signaling associated with a grant for this persistent control channel. Predetermined rules at the UE and scheduler can also be used to reserve appropriate resources and select appropriate MCS levels for control information and the control information and uplink data can be transported over a common uplink channel when a time overlap occurs between an uplink data channel and the persistent control channel. | 03-20-2014 |
20140119328 | Channel Rank Updates in Multiple-Input Multiple-Output Communication Systems - Embodiments of the disclosure provide a system and method for providing channel feedback information (CFI) from a user equipment device to a base station. CFI is transmitted from the user equipment device on first and second communication channels. The user equipment device is operable to measure the channel rank of a downlink channel and to select a preferred channel rank that is used to configure the CFI that is transmitted to the base station. The base station is operable to use the preferred channel rank to interpret the CFI transmitted by the user end device. | 05-01-2014 |
20140119329 | Techniques for Resource Block Mapping in a Wireless Communication System - A technique of operating a wireless communication device includes creating a resource block map by associating respective subscriber station identifications, corresponding to respective subscriber stations, with one or more resource blocks. The respective subscriber station identifications and the resource block map are transmitted, from a serving base station, in one or more control channel symbols. | 05-01-2014 |
20140119466 | Method and Device for Operating a Precoded MIMO System - A method is provided for generating precoder data ( | 05-01-2014 |
20140119468 | Generalized Codebook Design Method for Limited Feedback Systems - In a closed-loop wireless communication system, a codebook-based feedback mechanism is provided where each codeword indicates a particular profile to be used to provide a target performance measure (e.g., bit error rate or spectral efficiency) for the transmission channel. This may be accomplished by using a multi-stage quantization process to construct the codewords as a plurality of transmission parameters specifying a MIMO transmission scheme, precoding vector or matrix, power allocation in space/time/frequency, modulation and channel code. | 05-01-2014 |
20140126662 | Beamforming for Non-Collaborative, Space Division Multiple Access Systems - A wireless communication system non-collaborative, multiple input, multiple output (MIMO) space division multiple access (SDMA) system determines subscriber station combining and weighting vectors that yield a high average signal-to-interference plus noise ratio (SINR). Each subscriber station independently transmits information to a base station that allows the base station to determine a weight vector w | 05-08-2014 |
20140192915 | MULTI-USER MIMO-SDMA FOR FINITE RATE FEEDBACK SYSTEMS - A multi-user MIMO downlink beamforming system with limited feedback ( | 07-10-2014 |
20140198870 | Feedback Scheduling to Reduce Feedback Rates in MIMO Systems - In a closed-loop wireless communication system, a codebook-based feedback control mechanism is provided where feedback from each of a plurality of receivers is scheduled to control the feedback so that the receiving devices do not needlessly feed back precoding information to the transmitting device. The feedback may be controlled by establishing and distributing a schedule to control when each receiver feeds back precoding information, or by establishing and distributing a metric-based feedback threshold that must be satisfied before feedback is permitted. | 07-17-2014 |
20140245094 | Method for Efficient Control Signaling of Two Codeword to One Codeword Transmission - In a wireless communication system, a compact control signaling scheme is provided for signaling the selected retransmission mode and codeword identifier for a codeword retransmission when one of a plurality of codewords being transmitted over two codeword pipes to a receiver fails the transmission and when the base station/transmitter switches from a higher order channel rank to a lower order channel rank, either by including one or more additional signaling bits in the control signal to identify the retransmitted codeword, or by re-using existing control signal information in a way that can be recognized by the subscriber station/receiver to identify the retransmitted codeword. With the compact control signal, the receiver is able to determine which codeword is being retransmitted and to determine the corresponding time-frequency resource allocation for the retransmitted codeword. | 08-28-2014 |
20150016400 | System and Method for Resource Block-Specific Control Signaling - A system and method is disclosed for resource block-specific control signaling in a communication system. Communication data is transmitted using a transmission channel comprising a plurality of resource blocks defined by allocating time-frequency slots in a transmission resource. Resource block control information is transmitted in a “feed-forward” manner to a user end (UE) or group of UEs using channels physically mapped into scheduled resource blocks (RBs) for that user or group of users. Embodiments of the invention provide an RB-specific control channel that comprises RB control elements that are embedded within scheduled resource blocks. The invention, therefore, reduces the amount of control information that must be transmitted by common or shared control channels. | 01-15-2015 |
20150016560 | MIMO Precoding Enabling Spatial Multiplexing, Power Allocation and Adaptive Modulation and Coding - In a closed-loop wireless communication system, a codebook-based feedback mechanism is provided to enable non-unitary precoding for multi-stream transmission, where in each stream is optimized with suitable transmission power allocation and AMC. The codebook-based feedback mechanism uses a precoding codebook having a power allocation matrix which is constrained to specify that beamforming always applies full power to a predetermined beam. With this constraint, a one-bit power allocation feedback index may be used to switch between beamforming and spatial multiplexing. | 01-15-2015 |