The disclosure relates to a method performed in a network node for transmitting data in a wireless network. The network node is configurable for controlling a multiple input multiple output antenna system. The method comprises beamforming user specific data streams to one or more communication devices, UE.sub.1, . . . , UE.sub.K, wherein the beamforming is based on respective channel information available for each of the one or more communication devices, UE.sub.1, . . . , UE.sub.K, precoding control information streams using a transmit diversity scheme; and transmitting the beamformed user specific data streams and the precoded control information streams in a same transmission resource. The disclosure relates to a network node, method in communication device, communication device and computer programs and computer program products.

Apparatuses, methods, and systems for beamforming using tunable passive time-delay structures are disclosed. One apparatus includes a node, wherein the node includes a passive time-delay structure, wherein the passive time-delay structure is operative to generate a plurality of delayed signals, wherein each of the plurality of delayed signals is a delayed version of a communication signal, a tunable element, the tunable element operative to introduce a variable delay to the communication signal propagating through the passive time-delay structure, an antenna array, wherein the antenna array generates a beamforming pattern corresponding the passive time-delay structure, and a phase delay adjust control operative to adjust the tunable element of the passive time-delay structure, wherein a direction of the one or more beams of the beamforming pattern changes depending upon tuning of the tunable element.

A Station (STA) in a wireless communication system, the STA including a transceiver configured to transmit and receive a wireless signal; and a processor configured to control the transceiver. Further, the processor is further configured to: receive, from An access point (AP), a downlink (DL) multi-user (MU) Physical Protocol Data Unit (PPDU), wherein the DL MU PPDU includes a DL data and trigger frame for an uplink (UL) orthogonal frequency-division multiple access (OFDMA) transmission; and transmit, to the AP, an UL MU PPDU generated based on the DL MU PPDU, wherein the trigger frame is transmitted in a first frequency region of the DL MU PPDU, and the DL data is transmitted in a second frequency region of the DL MU PPDU, when the trigger frame is for multiple stations (STAs), and wherein the first frequency region and the second frequency region are different frequency region.

A method for transmitting data in a multiple-input-multiple-output space-time coded communication using a mapping table mapping a plurality of symbols defining the communication to respective antennae from amongst a plurality of transmission antennae and to at least one other transmission resource. The mapping table may comprise Alamouti-coded primary segments and may also comprise secondary segments, comprising primary segments. The primary segments in the secondary segments may be defined in accordance to an Alamouti based code pattern applied at the segment level to define a segment-level Alamouti based code.

A radio device receives data from a base station that transmits a first radio signal, carrying a first data block, in a first time window, and a second radio signal, also carrying the first data block, in a different, second time window. The radio device comprises first and second antennas, receive circuitry, and a switch for selectively connecting the receive circuitry to the first antenna or to the second antenna. It is configured to sample the first radio signal, received by the first antenna in the first time window, to generate first sampled data; disconnect the first antenna from the receive circuitry and connect the second antenna; sample the second radio signal, received by the second antenna in the second time window, to generate second sampled data; and use both the first sampled data and the second sampled data to decode the first data block.

Apparatuses, methods, and systems for beamforming to multiple users using switched passive time-delay structures are disclosed. One method includes an input switch that receives a plurality of input signals for transmission. Further, the apparatus includes a plurality of passive time-delay structures, wherein the input switch selectively connects the plurality of input signals to at least one of the plurality of passive time-delay structures, and wherein each of the passive time-delay structures is preconfigured to provide a plurality of delayed signals wherein each of the plurality of delayed signals is a delayed version of a one of the plurality of input signals. The apparatus further includes an antenna array, wherein the antenna array receives the plurality of delayed signals of the passive time-delay structures, and generates a beamforming pattern corresponding with a selected one of the passive time-delay structures.

A transmission apparatus includes a signal processing circuit and a transmission circuit. The signal processing circuit generates a first precoded signal and a second precoded signal by performing a precoding process on a first baseband signal and a second baseband signal, and generates a second reversed signal by performing an order reversion process on a symbol sequence forming the second precoded signal thereby generating a first transmission signal and a second transmission signal from the first baseband signal and the second baseband signal. The transmission circuit transmits the first transmission signal and the second transmission signal respectively from different antennas.

According to an aspect of the present invention, a method for performing a downlink (DL) multi-user (MU) transmission by an access point (AP) in a wireless communication system may include transmitting a DL MU Physical Protocol Data Unit (PPDU), where the DL MU PPDU includes a trigger frame including trigger information for an uplink (UL) MU transmission and a DL MU frame; and UL MU receiving a UL MU PPDU generated based on the DL MU PPDU, where the UL MU PPDU includes a UL MU frame based on the trigger frame and an acknowledge (ACK) frame in response to the DL MU frame.

A method for receiving a CSI-RS by a terminal in a wireless communication system according to an aspect of the present invention may comprise the steps of: receiving, from a base station, CSI-RS configuration information about a CSI-RS configuration to which the CSI-RS is mapped, wherein the CSI-RS configuration corresponds to merging of a plurality of legacy CSI-RS configurations, and the plurality of legacy CSI-RS configurations are mapped to a plurality of antenna ports numbered by corresponding legacy CSI-RS port numbers; and receiving the CSI-RS from the base station through the plurality of antenna ports on the basis of the CSI-RS configuration information.

A transmission method simultaneously transmitting a first modulated signal and a second modulated signal at a common frequency performs precoding on both signals using a fixed precoding matrix and regularly changes the phase of at least one of the signals, thereby improving received data signal quality for a reception device.