Patent application number | Description | Published |
20100027608 | Scrambled multicarrier transmission - Signals (typically in the form of OFDM signals) are transmitted between one or more transmitting antennas and one or more receiving antennas. The signals transmitted are subject to addition of a guard interval before scrambling in the time domain, while the signals received are subject to removal of the guard interval after scrambling in the time domain. Preferably time-scrambling of the OFDM signal being transmitted occurs after IFFT processing and guard interval insertion, while time de-scrambling of the signal being received occurs before both guard interval removal and FFT processing. Optionally, unscrambled pilot symbols (e.g. in the form of a training sequence), can be present at regular intervals inside the signal structure. At the receiver, equalization is carried out preferably in the frequency domain. | 02-04-2010 |
20100159841 | CHARACTERIZATION OF CO-CHANNEL INTERFERENCE IN A WIRELESS COMMUNICATION SYSTEM, IN PARTICULAR A CELLULAR RADIO COMMUNICATION SYSTEM - A method for characterizing interference in a radio communication system including a plurality of user equipment communicating with transceiver stations, includes: determining quantities indicative of interference (attenuation or power) experienced by a transceiver station interfered by interfering user equipment; and exchanging between transceiver stations information based on these quantities and concerning interference from the interfering user equipment. In particular, the user equipment is in communication with respective serving transceiver stations, and exchanging includes sending from the serving transceiver stations to the interfered transceiver stations information concerning interference from user equipment served by the serving transceiver stations and interfering with the interfered transceiver stations. The method further includes grouping, by the serving transceiver station, the interfering user equipment according to a given grouping criterion in order to form groups thereof. | 06-24-2010 |
20110206207 | PAPR REDUCTION IN MULTI-CARRIER TRANSMISSION - A multi-carrier data communication is selectively operable in one of different communication modes which result in differently structured communication signals, the communication being configured for processing a data item intended to be transmitted to generate different transmission candidate data; selecting one of the transmission candidate data for transmission; selecting one of the communication modes based on the selected data item; and transmitting the selected data item using the selected communication mode. | 08-25-2011 |
20120231742 | SCORE-BASED INTERFERENCE COORDINATION IN WIRELESS COMMUNICATION SYSTEMS - An interference coordination method for a radio communication system includes a plurality of user equipment configured to communicate on radio resources with transceiver stations exchanging between transceiver stations one or more coordination messages concerning interference on an interfered radio resource, and determining a score of a potential allocation of the interfered radio resource to potentially-interfered user equipment based on said coordination message or messages. In particular, the radio resource scheduling method includes generating, for a transceiver station serving respective served user equipment, a set of candidate aggregate allocations including corresponding potential allocations of radio resources to respective served user equipment, performing the interference coordination method to determine a score of each potential allocation in the candidate aggregate allocations, computing a total score of each candidate aggregate allocation based on the scores of the corresponding potential allocations, and allocating radio resources to respective served user equipment based on the total scores of the candidate aggregate allocations. | 09-13-2012 |
20120238263 | RADIO RESOURCE SCHEDULING FOR INTRA-SYSTEM INTERFERENCE COORDINATION IN WIRELESS COMMUNICATION SYSTEMS - A radio resource scheduling method for scheduling radio resources used for communications in a radio communication system includes user equipment configured to communicate with transceiver stations on the radio resources. The transceiver stations are configured to exchange coordination messages concerning radio resources affected by intra-system interference. The radio resource scheduling method includes allocating to each user equipment served by a transceiver station a corresponding radio resource and a corresponding transmission power level to communicate with the serving transceiver station. Allocating is based on coordination messages exchanged by the serving transceiver station. | 09-20-2012 |
20130003812 | METHOD FOR SELECTING A PRECODING MATRIX IN A MULTIPLE INPUT MULTIPLE OUTPU ("MIMO") SYSTEM - A method for selecting a precoding matrix to be used in a MIMO communication system includes a transmitter, a receiver and a communication channel, wherein the precoding matrix is used by the transmitter to precode codewords to be transmitted to the receiver over the communication channel. At the receiver, an optimum precoding matrix within a codebook of precoding matrices is determined on the base of a metric related to the power of received signal layers. An indication is then fed back from the receiver to the transmitter useful to enable the transmitter to select the optimum precoding matrix from the codebook. | 01-03-2013 |
20130034040 | METHOD AND SYSTEM FOR WIRELESS COMMUNICATIONS, CORRESPONDING NETWORK AND COMPUTER PROGRAM PRODUCT - A multiple-user multiple input-multiple output wireless communication system uses a set of multiple subcarriers arranged in plural subsets or resource blocks. Precoding of signals transmitted from a base station to user terminals involves acquiring channel state information on the connection channel between the base station and user terminals in the plurality. Channel quality indicators are detected with user terminals for respective subsets of resource blocks to produce user/resource block pairs having associated channel quality indicators. The user/resource block pairs are subjected to selection as a function of the channel quality indicators associated therewith so that precoding is performed by acquiring channel state information exclusively for the user/resource block pairs surviving the selection as a function of the channel quality indicators and, possibly, other selection steps as a function of other parameters, such as, speed, maximum bit rate, and direction of arrival or angular spread in a multiple-stage selection process. | 02-07-2013 |