A method of generating a transmission signal and a MIMO transmitter are disclosed. The method includes the steps of selecting a reference RE from an RE group including a plurality of resource elements (REs), generating a common precoder and a preprocessing filter to be shared by the plurality of the REs belonging to the RE group based on channel information of the reference RE, generating first signals corresponding to a precoding signal for each of the plurality of the REs in a manner of applying the common precoder to transmission data of each of the plurality of the REs and generating second signals in a manner of compensating first signals of REs except the reference RE among the plurality of the REs using channel information of each of plurality of the REs and the preprocessing filter.

The present disclosure relates to coordinating the pilot sequences that are used by several wireless devices being served by one or more network nodes. In particular it relates to coordinating pilot signals used by adjacent cells or by cells within a limited area. The disclosure also relates to a pilot coordination unit, to a network node, to a wireless device and to corresponding methods and computer programs. The disclosure proposes a method performed in a pilot coordination unit (120) in a communication system, for coordinating pilot sequences used by several wireless devices (10a, 10b) served by one or more network nodes (110a, 110b). The method comprises obtaining (S12), estimated angles of arrival, of the wireless devices (10a, 10b), in the corresponding serving network nodes (110a, 110b). The method further comprises allocating (S14) pilot sequences, to be used by the wireless devices (10a, 10b) based on the obtained estimated angles of arrival. The method also comprises providing (S15) information to the wireless devices about the respective allocated pilot sequence.

A wireless transmit/receive unit (WTRU) may generate a first signal that utilizes a tail suppression signal generated from data and utilizes a first unique word. Elements of the data and the first signal may be mapped to one or more discrete Fourier transform spread (DFT-S) functions. An inverse DFT on symbols generated by the one or more DFT-S functions may be performed to generate a second signal for transmission.

Disclosed is a transmission scheme for transmitting a first modulated signal and a second modulated signal over the same frequency at the same time. According to the transmission scheme, a precoding weight multiplying unit multiplies a baseband signal after a first mapping and a baseband signal after a second mapping by a precoding weight and outputs the first modulated signal and the second modulated signal. In the precoding weight multiplying unit, precoding weights are regularly hopped.

Disclosed is a transmission scheme for transmitting a first modulated signal and a second modulated signal in the same frequency at the same time. According to the transmission scheme, a precoding weight multiplying unit multiplies a precoding weight by a baseband signal after a first mapping and a baseband signal after a second mapping and outputs the first modulated signal and the second modulated signal. In the precoding weight multiplying unit, precoding weights are regularly hopped.

The present disclosure discloses a method and a system for transmitting DFT-s-OFDM symbols. A data sequence for transmitting as an OFDM symbol is received as input from a data source. A reference sequence for transmitting along with the data sequence as the OFDM symbol is generated and time-multiplexed with the data sequence, to generate a multiplexed sequence. Thereafter, a Discrete Fourier Transform (DFT) operation is performed on the multiplexed sequence to generate a DFT-spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) symbol that is further processed for transmitting over a channel. The transmission of the reference sequence and the data sequence in a single OFDM symbol provides better bandwidth utilization and flexibility in modulation of the reference sequence and the data sequence.

A wireless transmit/receive unit (WTRU) may generate a first signal that utilizes a tail suppression signal generated from data and utilizes a first unique word. Elements of the data and the first signal may be mapped to one or more discrete Fourier transform spread (DFT-S) functions. An inverse DFT on symbols generated by the one or more DFT-S functions may be performed to generate a second signal for transmission.

A transmission method for transmitting a first modulated signal and a second modulated signal in the same frequency at the same time. Each signal has been modulated according to a different modulation sheme. The transmission method applies precoding on both signals using a fixed precoding matrix, applies different power change to each signal, and regularly changes the phase of at least one of the signals, thereby improving received data signal quality for a reception device.

A vectoring controller for configuring a vectoring processor that jointly processes DMT communication signals to be transmitted over, or received from, a plurality of N subscriber lines according to a vectoring matrix. In accordance with an embodiment, the vectoring controller is configured, for given ones of a plurality of tones, to enable the given tone for direct data communication over a first set of NMk targeted lines out of the plurality of N subscriber lines, and to disable the given tone for direct data communication over a second disjoint set of Mk supporting lines out of the plurality of N subscriber lines, Mk denoting a non-null positive integer. The vectoring controller is further configured to configure the vectoring matrix to use an available transmit or receive power at the given tone over the second set of Mk supporting lines for further enhancement of data signal gains at the given tone over the first set of NMk targeted lines.

Embodiments herein disclose a method of enabling non-ICBM transmissions in the communication network. The method includes transmitting information of the number of receiver antennas at user equipments (UEs) intended to be scheduled by a transmitter in common resource elements, to a controller in the communication network. Further, the method includes receiving a number of non-Interference Cancelling Block Modulation (ICBM) transmissions from the controller. Furthermore, the method includes transmitting information indicating cell-identification numbers of participating transmitters, and corresponding index of ICBM precoder matrix of the participating transmitters to the UEs.