Patent application number | Description | Published |
20110176629 | DOWNLINK TRANSMISSION IN A MULTIPLE-USER MULTIPLE-INPUT MULTIPLE-OUTPUT ("MU-MIMO") WIRELESS COMMUNICATION SYSTEM - Information transmission in a multiple-input multiple-output (“MIMO”) wireless communication system is provided. In one embodiment, a method for transmitting information in a MIMO wireless communication system, comprising updating channel quality information (“CQI”) values of a plurality of wireless devices, wherein updating said CQI values consider the effects of interference from transmissions to those wireless devices associated with a pre-assigned companion codeword set; pairing said plurality of wireless devices using at least said CQI values, a precoding matrix index (“PMI”) value and said pre-assigned companion codeword set, wherein said pre-assigned companion codeword set, pre-assigned companion codewords associated with said pre-assigned companion codeword set and said PMI value are updated for each of said plurality of wireless devices; precoding the information for each of said plurality of wireless devices using said PMI value; and transmitting said precoded information to each of said plurality of wireless devices. | 07-21-2011 |
20110200126 | CHANNEL ESTIMATION AND DATA DETECTION IN A WIRELESS COMMUNICATION SYSTEM IN THE PRESENCE OF INTER-CELL INTERFERENCE - Channel estimation and data detection in a wireless communication system in the presence of inter-cell interference is provided. In one embodiment, a method for channel estimation and data detection in a wireless communication system, comprising receiving a signal, wherein said signal is composed of a data signal, a desired reference signal and an interference reference signal; selecting a channel estimator using said desired reference signal, said interference reference signal or both; applying said selected channel estimator to said desired reference signal, said interference reference signal or both to generate one or more reference signal channel estimate weights; generating one or more data channel estimate weights using said reference signal channel estimate weights; selecting a data detector using said reference signal channel estimate weights, said data channel estimate weights or both; and detecting said data signal using said selected data detector, wherein said selected data detector uses said reference signal channel estimate weights, said data channel estimate weights or both. | 08-18-2011 |
20110200131 | Low Overhead PMI and CQI Feedback and Pairing Schemes for MU-MIMO - A method is provided for searching for a pairing PMI including estimating a MIMO wireless propagation channel from an access point transmitter to a receiver at a UE; quantizing the estimated channel with a codebook consisting of a plurality of codewords, the result being an actual SU-MIMO PMI currently applicable to the UE; estimating the channel quality corresponding to the actual SU-MIMO PMI, resulting in at least one CQI for the UE; constructing a plurality of subsets from a codebook of codewords, wherein each subset comprises potential MU-MIMO PMIs that represent channels that have reduced interference with a channel represented by one of the potential SU-MIMO PMIs; associating each potential SU-MIMO PMI with the subset that comprises the potential MU-MIMO PMIs that represent channels that have reduced interference with the channel represented by that potential SU-MIMO PMI; searching for an appropriate pairing PMI and the associated CQI for the UE. | 08-18-2011 |
20110222469 | MODULATION AND CODING SCHEME SELECTION METHOD FOR A SPECIFIC ABSORPTION RATE COMPLIANT COMMUNICATION DEVICE - Transmission of data from a portable communication device to a base station via a radio frequency signal uses a plurality of modulation and coding schemes and a protocol that has recurring frames. Each frame has a plurality of transmission slots, different numbers of which can be used to transmit data. When it is desired to transmit data a higher rate than was used previously, an attempt is made to increase the number transmission slots being used. If doing so, produces a transmission results in a specific absorption rate limit being exceeded, then the modulation and coding scheme is changed to one having a greater data coding rate. The power level and the number transmission slots then are set so that the data transmission does not exceed the specific absorption rate limit. The data is then transmitted by the portable communication device. | 09-15-2011 |
20110261745 | TRANSMISSION IN A RELAY NODE-BASED WIRELESS COMMUNICATION SYSTEM - Methods, devices and systems for improved transmission in a remote node-based wireless communication system is provided. In one embodiment, a method of wireless communication comprises receiving a downlink signal from a first node, demodulating said received downlink signal, generating a channel quality measurement (“CQM”) value of said demodulated downlink signal, determining said CQM value exceeds a first threshold, modulating said demodulated downlink signal to form a processed downlink signal, and cooperatively transmitting said processed downlink signal with said first node to a wireless device. | 10-27-2011 |
20120076077 | Efficient Signaling of Discontinuous Transmission - Methods and devices are disclosed for efficient signaling of discontinuous transmission in a wireless communication system. In various aspects of the disclosure, a user equipment device monitors transmissions on a plurality of physical downlink control channels (PDCCHs) and, in response to said transmissions, generates an acknowledge/negative acknowledge (ACK/NACK) signal comprising a plurality of bits, wherein the plurality of bits includes a discontinuous transmission (DTX) indicator bit. In some embodiments, the indicator bit corresponds to an even or odd number of PDCCHs successfully decoded. In other embodiments, the indicator bit corresponds to an odd or even number of component carriers comprising “TRUE” NACKs. | 03-29-2012 |
20130182791 | SPARSE CODES FOR MIMO CHANNEL AND DETECTOR ALTERNATIVES FOR SPARSE CODE - Embodiments are disclosed for improved systems and methods for encoding and decoding information transmitted using multiple-input-multiple-output (MIMO) communication devices. Structurally sparse codes are implemented based on principles of compressive sampling Improved detectors are also disclosed for implementing basis pursuit and basis pursuit with runner-up detection techniques. | 07-18-2013 |
20130259149 | MULTI-USER COMMUNICATION USING SPARSE SPACE CODES - Multi-user sparse space codes are proposed as a new transmission scheme for uplink communication over a multi-user multiple-input-multiple-output (MIMO) communication channel. | 10-03-2013 |
20140098900 | DOWNLINK MULTI-USER INTERFERENCE ALIGNMENT SCHEME - A method, system and device are provided for using a predetermined vector, v | 04-10-2014 |
20140219373 | MIXED RANK DOWNLINK COMPOUND MULTI-USER INTERFERENCE ALIGNMENT SCHEME - A method, system and device are provided to enable one or more users to receive mixed-rank data from two transmitters by using an indexed list of linearly independent, predetermined vectors V | 08-07-2014 |
20140348253 | MIXED RANK DOWNLINK MULTI-USER INTERFERENCE ALIGNMENT SCHEME - A method, system and device are provided for using an indexed list of linearly independent, predetermined vectors V | 11-27-2014 |