Described are devices, systems and methods for scheduling multi-user (MU) multiple input multiple output (MIMO) transmissions in a fixed wireless access (FWA) system. One method for scheduling a large number of user devices in a wireless communication system includes a preselection process to pare down the number of user devices to be simultaneously scheduled, and then scheduling that subset of users. In an example, and assuming each user device communicates over a corresponding wireless channel, the preselection process includes determining a number of sets based on a first characteristic of the wireless channels, where each set includes at least one user device, and then determining a subset of user devices by selecting at most one user device from each of the sets. The scheduling of the selected subset of users is based on a scheduling algorithm and a second characteristic of the wireless channels.

A communication device is provided that includes a baseband circuit and a transmitter configured to transmit a first signal and a projected signal. The baseband circuit is configured to determine the projected signal based on an estimated signal state information such that an energy of a shaped projected signal is smaller than an energy of a shaped signal. The estimated signal state information is an estimate of a signal state information based on the first signal and a received signal that is received by a receiver of the second communication device. The shaped projected signal is the projected signal received by the receiver of the second communication device and filtered by a filter of the second communication device. The shaped signal is the received signal filtered by the filter of the second communication device.

A method of transmitting an electronic attack signal includes obtaining channel information about each of objects to be attacked, generating a beamforming matrix, based on the channel information, determining respective intensities of electronic attack signals to be respectively transmitted to the objects, based on the channel information and the beamforming matrix, and transmitting the electronic attack signals of the intensities respectively determined for the objects to the objects, respectively.

A method and device for allocating transmission powers, wherein the method and the device are applied to a base station. The method includes: acquiring channel data of terminals that are connected to the base station; according to the channel data of the terminals, from the terminals, virtually pre-dispatching first terminals of a first preset quantity; performing interference suppression to the first terminals, to obtain beamforming-weight-amplitude factors of the first terminals; dispatching second terminals of a second preset quantity from the first terminals, and, from the beamforming-weight-amplitude factors of the first terminals, screening out beamforming-weight-amplitude factors of the second terminals; and according to the beamforming-weight-amplitude factors of the second terminals, allocating transmission powers to the second terminals. The embodiments of the present application ensure that the frequency-deviation efficiency that is reported to the MAC layer of the base station has a smaller difference from that of the actual dispatching.

A communication device is provided that includes a baseband circuit and a transmitter configured to transmit a first signal and a projected signal. The baseband circuit is configured to determine the projected signal based on an estimated signal state information such that an energy of a shaped projected signal is smaller than an energy of a shaped signal. The estimated signal state information is an estimate of a signal state information based on the first signal and a received signal that is received by a receiver of the second communication device. The shaped projected signal is the projected signal received by the receiver of the second communication device and filtered by a filter of the second communication device. The shaped signal is the received signal filtered by the filter of the second communication device.

A method and device for allocating transmission powers, wherein the method and the device are applied to a base station. The method includes: acquiring channel data of terminals that are connected to the base station; according to the channel data of the terminals, from the terminals, virtually pre-dispatching first terminals of a first preset quantity; performing interference suppression to the first terminals, to obtain beamforming-weight-amplitude factors of the first terminals; dispatching second terminals of a second preset quantity from the first terminals, and, from the beamforming-weight-amplitude factors of the first terminals, screening out beamforming-weight-amplitude factors of the second terminals; and according to the beamforming-weight-amplitude factors of the second terminals, allocating transmission powers to the second terminals. The embodiments of the present application ensure that the frequency-deviation efficiency that is reported to the MAC layer of the base station has a smaller difference from that of the actual dispatching.

Disclosed is an apparatus and a method of deriving an optimal precoder, in which a precoder is derived using water filling power allocation, and then is multiplied with some unitary matrix satisfying certain conditions to meet a per layer power constraint. Since the multiplication with the unitary matrix does not change the capacity, the derived precoder is optimal in achieving maximum capacity in a multiple input multiple output (MIMO) wireless communication scheme.

A communication device is provided that includes a baseband circuit and a transmitter configured to transmit a first signal and a projected signal. The baseband circuit is configured to determine the projected signal based on an estimated signal state information such that an energy of a shaped projected signal is smaller than an energy of a shaped signal. The estimated signal state information is an estimate of a signal state information based on the first signal and a received signal that is received by a receiver of the second communication device. The shaped projected signal is the projected signal received by the receiver of the second communication device and filtered by a filter of the second communication device. The shaped signal is the received signal filtered by the filter of the second communication device.

The method comprises receiving periodic CSI feedback configuration information including a periodicity value and an offset value corresponding to a first CSI report, and at least one periodicity value and at least one offset value corresponding to a second CSI report, measuring a first CSI reference signal (CSI-RS) and a second CSI-RS configured for a periodic CSI reporting based on at least two different enhanced MIMO types (eMIMO-Types), generating the first CSI report and the second CSI report for the first eMIMO-Type and the second eMIMO-Type, respectively, determining a periodic reporting interval for each of the first CSI report and the second CSI report, and reporting the first and second CSI reports based on the determined periodic reporting intervals using a physical uplink control channel (PUCCH) format 2 or a PUCCH format 3 or a combination of the PUCCH format 2 and the PUCCH format 3.

A communication device is provided that includes a baseband circuit and a transmitter configured to transmit a first signal and a projected signal. The baseband circuit is configured to determine the projected signal based on an estimated signal state information such that an energy of a shaped projected signal is smaller than an energy of a shaped signal. The estimated signal state information is an estimate of a signal state information based on the first signal and a received signal that is received by a receiver of the second communication device. The shaped projected signal is the projected signal received by the receiver of the second communication device and filtered by a filter of the second communication device. The shaped signal is the received signal filtered by the filter of the second communication device.