Abstract: An apparatus and a method for control signaling are disclosed. The method comprises communicating (402) with one or more user terminals utilising Time Division Duplexing, estimating (404) uplink precoder parameters for the one or more user terminals, the parameters comprising an uplink precoder matrix and a scaling factor and transmitting (406) the uplink precoder parameters utilising a downlink pilot signal and downlink control signalling.

Abstract: An apparatus and a method for control signaling are disclosed. The method comprises communicating (402) with one or more user terminals utilising Time Division Duplexing, estimating (404) uplink precoder parameters for the one or more user terminals, the parameters comprising an uplink precoder matrix and a scaling factor and transmitting (406) the uplink precoder parameters utilising a downlink pilot signal and downlink control signalling.

Abstract: The invention relates to an apparatus including: at least one processor and at least one memory including a computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: choose a modulation, coding and rank scheme; determine a channel quality indicator based on the modulation, coding and rank scheme, and add a detector class indicator to the channel quality indicator for informing capability to a high order modulation if the high order modulation is chosen. In one particular embodiment the high order modulation is 64-QAM and excludes QPSK and 16-QAM, and the added detector class indictor can be a single bit.

Abstract: The invention relates to an apparatus including: at least one processor and at least one memory including a computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: choose a modulation, coding and rank scheme; determine a channel quality indicator based on the modulation, coding and rank scheme, and add a detector class indicator to the channel quality indicator for informing capability to a high order modulation if the high order modulation is chosen. In one particular embodiment the high order modulation is 64-QAM and excludes QPSK and 16-QAM, and the added detector class indictor can be a single bit.

Abstract: The invention relates to an apparatus including: at least one processor and at least one memory including a computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: obtain a channel quality indicator comprising a detector class indicator informing transmitter's capability to a high order modulation, and substitute the modulation, coding and rank scheme utilizing the high order modulation with a modulation, coding and rank scheme utilizing a lower order modulation and providing nearest similar performance, if the high order modulation is not supported by a receiver.

Abstract: A method, apparatus, and computer program for cooperative transmission are provided. A re-transmitter for a data packet determined as not having been received at a re-ceiver correctly is selected amongst the potentialre-transmitters in a cooperative transmission mode. In more detail, the re-transmitter is selected amongst an original transmitter of the data packet and assisting transmitters configured to assist transmission of the original transmit-ter. The assisting transmitters receive the data packet in the original transmission, unless errors occur in the reception at a given assisting transmitter, and are candidates for the retransmission in case the original transmission results in erroneous reception at the receiver.

Abstract: The invention relates to an apparatus including: at least one processor and at least one memory including a computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: obtain a channel quality indicator comprising a detector class indicator informing transmitter's capability to a high order modulation, and substitute the modulation, coding and rank scheme utilising the high order modulation with a modulation, coding and rank scheme utilising a lower order modulation and providing nearest similar performance, if the high order modulation is not supported by a receiver.

Abstract: There is provided a method comprising: determining a phase difference between at least two antenna units of a distributed antenna system on the basis of at least one pilot signal received from at least one of a plurality of antenna units; and transmitting phase correction commands to a common base station of the plurality of antenna units on the basis of the determined phase difference in order to synchronize carrier phases between at least two antenna units of the distributed antenna system.

Abstract: A receiver arranged to receive a plurality of spread spectrum signals including a first spread spectrum signal from which interference caused by one or more others of said plurality of signals is to be removed, wherein at least one of said other spread spectrum signals has a spreading factor which is unknown to said receiver. The receiver comprises means for estimating a spreading factor of said at least one other spread spectrum signal having an unknown spreading factor, said estimating means selecting the spreading factor to be smallest possible spreading factor, means for despreading said at least one other spread spectrum signal using said estimated spreading factor, and means for estimating interference in the first spread spectrum signal caused by said at least one other spread spectrum signal.

Abstract: A method, apparatus, and computer program for cooperative transmission are provided. A re-transmitter for a data packet determined as not having been received at a re-ceiver correctly is selected amongst the potentialre-transmitters in a cooperative transmission mode. In more detail, the re-transmitter is selected amongst an original transmitter of the data packet and assisting transmitters configured to assist transmission of the original transmit-ter. The assisting transmitters receive the data packet in the original transmission, unless errors occur in the reception at a given assisting transmitter, and are candidates for the retransmission in case the original transmission results in erroneous reception at the receiver.

Abstract: A solution for optimizing beamforming configurations and transmit power allocation configurations in a telecommunication system comprising a base station and a plurality of user entities is provided. The base station and the user entities are capable of multiple-input multiple-output (MIMO) communications, i.e. capable of communicating through spatial subchannels. The base station calculates iteratively optimal beamforming configurations for the base station and for each user entity and transmit power allocation configurations for each spatial subchannel used in MIMO communications. The base station carries out the calculation on the basis of channel state information received from the user entities by utilizing the information on correlation of different spatial subchannels, i.e. interference between the subchannels, in order to update beamforming configurations and transmit power allocation configurations.

Abstract: The invention relates to a method, a prefiltering arrangement and a base station for implementing an adaptive channel estimator. The method comprises determining from a received signal at least one variable representing statistical characteristics of a channel, determining a prefilter by means of the at least one variable representing the statistical characteristics of the channel, and adapting the prefilter output sample rate for the channel estimator.

Abstract: There is provided a method comprising: determining a phase difference between at least two antenna units of a distributed antenna system on the basis of at least one pilot signal received from at least one of a plurality of antenna units; and transmitting phase correction commands to a common base station of the plurality of antenna units on the basis of the determined phase difference in order to synchronize carrier phases between at least two antenna units of the distributed antenna system.

Abstract: Disclosed is a chip-level or a symbol-level equalizer structure for a multiple transmit and receiver antenna architecture system that is suitable for use on the WCDMA downlink. The equalizer structure takes into account the difference in the natures of inter-antenna interference and multiple access interference and suppresses both inter-antenna interference and multiple access interference (MAI). Enhanced receiver performance is achieved with a reasonable implementation complexity. The use of the CDMA receiver architecture, in accordance with this invention, enables the realization of increased data rates for the end user. The CDMA receiver architecture can also be applied in conjunction with space-time transmit diversity (STTD) system architectures.

Abstract: Disclosed is a chip-level or a symbol-level equalizer structure for a multiple transmit and receiver antenna architecture system that is suitable for use on the WCDMA downlink. The equalizer structure takes into account the difference in the natures of inter-antenna interference and multiple access interference and suppresses both inter-antenna interference and multiple access interference (MAI). Enhanced receiver performance is achieved with a reasonable implementation complexity. The use of the CDMA receiver architecture, in accordance with this invention, enables the realization of increased data rates for the end user. The CDMA receiver architecture can also be applied in conjunction with space-time transmit diversity (STTD) system architectures.

Abstract: The invention relates to a method of transmitting data from a transmitter to a receiver in a radio system, and to a radio system.

Abstract: A solution for optimizing beamforming configurations and transmit power allocation configurations in a telecommunication system comprising a base station and a plurality of user entities is provided. The base station and the user entities are capable of multiple-input multiple-output (MIMO) communications, i.e. capable of communicating through spatial subchannels. The base station calculates iteratively optimal beamforming configurations for the base station and for each user entity and transmit power allocation configurations for each spatial subchannel used in MIMO communications. The base station carries out the calculation on the basis of channel state information received from the user entities by utilizing the information on correlation of different spatial subchannels, i.e. interference between the subchannels, in order to update beamforming configurations and transmit power allocation configurations.

Abstract: Disclosed is a chip-level or a symbol-level equalizer structure for a multiple transmit and receiver antenna architecture system that is suitable for use on the WCDMA downlink. The equalizer structure takes into account the difference in the natures of inter-antenna interference and multiple access interference and suppresses both inter-antenna interference and multiple access interference (MAI). Enhanced receiver performance is achieved with a reasonable implementation complexity. The use of the CDMA receiver architecture, in accordance with this invention, enables the realization of increased data rates for the end user. The CDMA receiver architecture can also be applied in conjunction with space-time transmit diversity (STTD) system architectures.

Abstract: A method, a transceiver, a telecommunications system, and a computer program are provided. According to the invention, a sampled receive signal is generated from a receive signal. An interference level threshold is derived on the basis of an iterative statistical analysis of the sampled receive signal, and an interfered portion of a signal space is identified on the basis of a comparison of the sampled receive signal and the interference level threshold. In an embodiment, the transmit resources are reduced from the interfered portion of the signal space.

Abstract: The invention relates to a method, a prefiltering arrangement and a base station for implementing an adaptive channel estimator. The method comprises determining from a received signal at least one variable representing statistical characteristics of a channel, determining a prefilter by means of the at least one variable representing the statistical characteristics of the channel, and adapting the prefilter output sample rate for the channel estimator.