Abstract: The present invention relates to a closed-loop signaling method for controlling multiple transmit beams, comprising the steps of receiving (S21) a plurality of at least two beams from a first transceiver (Node_B) via a plurality of transmission channels at a second transceiver (UE), evaluating (S22), at said second transceiver, characteristics of said plurality of beams received at said second transceiver, determining at least one dominant beam using said characteristic, deriving (S24) control information for being fed back from said second transceiver (UE) to said first transceiver (Node_B), based on said evaluated characteristics, wherein said control information for dominant characteristics is allocated a different quantization resolution as compared to a less dominant beam (S25, S26, S27). Also, the present invention relates to a transceiver device (UE), adapted for being used in such a closed-loop signaling method for controlling multiple transmit beams.

Abstract: The invention relates to a method for controlling the weighting of a data signal in the at least two antenna elements of a first radio connection unit of a radio communications system, which data signal is to be distributed for parallel transmission to a second radio connection unit to at least two beams. In order to improved such a method, it comprises: determining in the second radio connection unit a weight information enabling the first radio connection unit to determine the sets of weights for suitable beams for transmission and transmitting it to the first radio connection unit; and distributing the data signal in the first radio connection unit to those sets of weights and transmitting the data signals simultaneously via the formed beams. Alternatively or additionally, the second unit determines the number of beams to be used and informs the first unit about it. The invention equally relates to corresponding radio connection units, radio connection unit modules and radio communications systems.

Abstract: A wireless communication system is disclosed that includes forming one or more beam patterns by a transmitter at a first time, where the beam patterns are made up of a first set of beam patterns used to transmit data during the first time, and a second set of beam patterns used to transmit data during a subsequent time. A pilot signal is transmitted on each of the beam patterns and is detectable and decodable by one or more receivers. The receivers test the quality of the beam patterns and transmit an indicator to the transmitter that relates to one of the beam patterns that has a high channel quality. The transmitter determines channel estimation, transmission scheduling, and/or resource allocation based, at least in part, on the indicator.

Abstract: A closed-loop signalling method controls multiple transmit beams. The method also includes transmitting a plurality of beams from a first transceiver via a plurality of transmission channels to a second transceiver, evaluating, at the second transceiver, characteristics of the plurality of transmitted beams received at the second transceiver. The method also includes deriving, at the second transceiver, beamforming information for being fed back from the second transceiver to the first transceiver based on the evaluated characteristics. The beamforming information is usable for controlling, at the first transceiver, the transmitting of the plurality of beams. The method also includes selecting, at the second transceiver, at least one set of beamforming information for being fed back from the second transceiver via a feedback path to the first transceiver.

Abstract: First are determined which relays are available between at least one source and at least one destination, and from them are selected a subset of those relays for an activation interval under a constraint of equal transmit energy per selected relay across the activation interval. A matrix is formed, using CSI received from the relays, to evaluate each effective channel between source and destination that goes through each of the relays, including multi-relay hops, and the relays are selected from that matrix. Utility of source-relay pairing is evaluated in view of the relay-destination channel and the pairing enables relays to multiplex multiple sources where feasible.

Abstract: The present invention concerns a diversity transmitter, comprising: transmit symbol input means (1) for inputting a symbol matrix (b) to be forwarded to a transmit processing means (2), said transmit processing means comprising supplying means (2a) for supplying columns of said symbol to a plurality of at least two branches, each branch being supplied to a respective one of spatial channels (A1, . . . , Am) for transmission to a receiver, a parallelization means (2b) adapted to provide within each branch at least two parallel channels allocated to a respective user, and weighting means (2c) adapted to subject the symbol signals on at least one of said branches to an invertible linear transformation with a fixed complex weight, the complex weight being different for at least two parallel channels. The present invention also concerns a corresponding diversity transmission method.

Abstract: A method, an arrangement and a controller are provided for controlling communication resources, such as spatial and temporal communication resources of a telecommunications system. A performance measure characterizing a communication channel between a first transceiver and a second transceiver is determined. The communication channel includes modulation and modulation symbols are distributed for use in at least two radiation patterns. The performance measures are sensitive to the modulation and are the basis for controlling the communication resources.

Abstract: A relay for use in a communications network, said relay comprising a receiver for receiving signals from a plurality of first nodes; a transmitter for transmitting a transmission signal derived from said received signal to at least one of a plurality of second nodes, said transmitter having a coverage area; control means for controlling the transmitter, whereby said transmission signal is transmitted by said transmitter to at least one of said second nodes over only a part of said coverage area.

Abstract: A method for the treatment of wood or wood products, in which method moist wood or wood products (1) are first dried by pressing and further by heating so that a desired degree of dryness is reached. In the first stage, the wood or wood products (1) arranged between treating elements (2) are pressed between the treating elements (2) so that liquid is removed from the wood being treated. In the method, as a result of the combined effect of the pressure, the liquid and/or gaseous substance released into the chamber space from the wood material being treated and possibly also air circulation arranged in the treatment chamber, a change of temperature in the treatment chamber from a lower temperature (T1) to a higher temperature (T2) is achieved without supplying additional heat into the chamber.

Abstract: A method of allocating a set of sub-channels to a plurality of transmission channels in a multi transmission-channel system comprising the steps of; mapping a first, non-zero, set of sub-channels to a first transmission channel, mapping a second, non-zero, set of sub-channels to a second transmission channel, wherein at least one sub-channel of the first set and at least one sub-channel of the second set are allocated to one receiving unit.

Abstract: This invention describes a method for precoding in a transmitter utilizing a multichannel transmission, using a precoder for, e.g., M-QAM (M>4) modulated OFDM systems. The invention describes a new precoding method that is suitable for use, e.g., in an MB-OFDM UWB system especially when targeting for high data rates (above 480 Mbps). This may involve transmitting 16-QAM in place of 4-QAM symbols. The method could be adopted also for some future wireless LANs (local area networks), for future evolutions of 3G and for 4G systems.

Abstract: A method for space-time-frequency coding pieces of data includes receiving a stream of a plurality of pieces of data in a multi-antenna transmission system, where the data may comprise a stream of orthogonal frequency division multiple access (OFDMA) symbols, orthogonal frequency division multiplexed (OFDM) symbols or the like. The pieces of data are then coded across space, time and frequency dimensions based upon a plurality of space-time-frequency (STF) codes. The pieces of data are coded such that one or more STF codes in the frequency dimension differ from one or more other STF codes in the frequency dimension. In this regard, the frequency dimension can include a plurality of frequency bins such that the pieces of data can be coded in a manner whereby the plurality of STF codes sequentially circulates through sets of at least one frequency bin in the frequency domain.

Abstract: Apparatus, methods and computer program products implement a channel-aware approach for controlling a relay network operative in a wireless communications system wherein weighting matrices are used at a MIMO-capable source electronic device and at the relays where at least one of the weighting matrices is selected or derived using knowledge of channel components of at least one channel link, where the channel link may be from the relays to the destination antennas of the destination device; or from source antennas of the MIMO-capable source device to the relays, or from the source antennas of the MIMO-capable source device to the destination antennas of the destination device. In one approach weighting matrices applied at the source and relay nodes are selected from a predetermined codebook of weighting matrices in dependence on monitored channel conditions. Alternatively, the weighting matrices may be determined using an eigenvalue decomposition and power allocation (e.g.

Abstract: A method and corresponding wireless communication equipment, for use for example in connection with automatic retransmission request protocols for orthogonal frequency and code division multiplexing (OFCDM) wireless communication, the method including: a step in which the wireless communication equipment communicates an original transmission of a signal including two symbol streams each conveyed by at least two subcarriers of a single wideband carrier, where each symbol stream is conveyed by each of the at least two subcarriers after multiplication by a respective factor, the factors associated with each symbol stream forming a multicode for the symbol stream and the respective multicodes for the two symbol streams being mutually orthogonal; and a step in which the wireless communication equipment retransmits the signal, with the retransmission such that one factor is reversed in sign for each subcarrier.

Abstract: A wireless node, such as a relay node, has different operating modes for unicast and broadcast/multicast subchannels. For unicast services the phase offsets of those relay nodes engaged in a cooperative transmission are optimized for the subchannels used for unicast services. Alternatively, when no feedback is available and an open loop MIMO or MIMO-type scheme is in use, retransmissions are performed in such a way that a destination (e.g., user terminal) receives effectively a distributed space-time block code. For the broadcast/multicast services time varying random phase offsets may be employed for the subchannels used for broadcast services. For reliable high data rate broadcast transmissions a cooperative retransmission scheme that effectively forms distributed space-time block codes may be used.

Abstract: The performance and symbol rate in a wireless mobile system are increased by forming a transmission code matrix using transformed orthogonal codes, in such a way that the code is robust to channel statistics and operates well in both Ricean and (correlated) Rayleigh channels. Furthermore, the invention enables high symbol rate transmission using multiple transmit antennas, and one or multiple receive antennas, and obtains simultaneously high diversity order and high symbol or data rate.

Abstract: A device and method for block transmission include a storage configured to store at least one transmission matrix relating to a set of symbols, and a processor configured to process at least part of the at least one transmission matrix to symbols forming at least a subset of the set of symbols for forming processed symbols. The device and method further include a generator configured to generate at least one transmission signal based on the processed symbols. The at least one transmission matrix is a direct product of a first matrix and a second matrix. The second matrix is different from an identity matrix. A size of each of the second matrix and the first matrix being at least two times two. At least one entry of the first matrix having a complex value.

Abstract: A transmitter and an applicable method include an antenna system for achieving two transmit paths, a first modulator for modulating a signal to be transmitted into complex modulation symbols, and a second modulator for constructing layered channel symbols as linear combinations of the complex modulation symbols. The second modulator constructs channel symbols by using first and second non-zero coefficients when performing the linear combination. The ratio of the first and second coefficients is not a real number. The channel symbols are transmitted by using a first non-zero total power for transmission on a first transmit path, and a second non-zero total power for transmission on a second transmit path, wherein the first and second total powers are not equal.

Abstract: The invention relates to a method and an arrangement for transmitting a digital signal consisting of symbols, which arrangement comprises a coder (308) for coding complex symbols to channel symbols in blocks having the length of a given K, means (312) for transmitting the channel symbols via several different channels and two or more antennas (314 to 318). The coder (308) is arranged to code the symbols using a code matrix, which can be expressed as a sum of 2K elements, in which each element is a product of a symbol or symbol complex conjugate to be transmitted and a N×N representation matrix of a complexified anti-commutator algebra, extended by a unit element, and in which each matrix is used at most once in the formation of the code matrix. A code matrix is also provided which is formed by matrices of a portion of the symbols placed on the diagonal of the code matrix and by matrices of a second portion of symbols along the anti-diagonal of the code matrix.

Abstract: A signal for relay is received from a first node. From a local memory that stores K transform matrices (K being an integer greater than one) is selected a transform matrix that is associated with a relay rank order. The matrices define an optimal tradeoff of diversity gain versus spatial multiplexing. The received signal is transformed using the selected transform matrix, and the transformed signal is relayed over a wireless channel to a second node. In a particular embodiment the received signal is an input symbol vector of N consecutive symbols (N being an integer at least equal to two) and the transform linearly combines the N symbols of the input vector according to the relay rank order. In various embodiments the first node may give the rank order, it may be mutually agreed via signaling among the various relay nodes, or it may be based on an intrinsically generated random number.