The present invention provides methods and apparatus for implementing spatial multiplexing in conjunction with the one or more multiple access protocols during the broadcast of information in a wireless network. One example includes transmitting a first and a second data signal to a remote unit from a respective first and a second spatially separate antenna of a base station so that the first and second data signals have a first spatial configuration, determining that the first and the second data signals are not spatially separated by the remote unit, reconfiguring the (spatial multiplexing logic 104) spatial configuration of the first and second data signals to a second spatial configuration, and transmitting a third and fourth data signal to the remote unit from a second different antenna configuration according to the second spatial configuration.

A method for a user equipment for reporting aperiodic channel status information in a carrier aggregation system according to one embodiment of the present invention is carried out by the user equipment and may comprise the steps of: receiving downlink control information, comprising a CSI request field, for approving an uplink from a base station; selecting one triggering set from among a plurality of triggering sets corresponding to the particular bit value of the CSI request field; and transmitting, to the base station, CSI for at least one CC or CSI process included in the selected triggering set.

A transmitter includes first generator to generate pilot source signal by modulating pilot sequence, second generator to generate data source signal with time length longer than that of pilot source signal by modulating data sequence, first cyclic shifter to perform cyclic shift of first shift amount to pilot source signal to generate first pilot signal, second cyclic shifter to performs cyclic shift of second shift amount to data source signal to generate first data signal, third cyclic shifter to perform cyclic shift of third shift amount to pilot source signal to generate second pilot signal, fourth cyclic shifter to perform cyclic shift of fourth shift amount to data source signal to generate second data signal, first transmit antenna to transmit first pilot signal and first data signal, and second transmit antenna to transmit second pilot signal and second data signal.

Embodiments of this disclosure provide a method and apparatus for transmitting a signal and a communications system. The method includes: superimposing, by a transmitting device, symbols which are to be transmitted to multiple pieces of user equipment, to form a superimposed symbol; performing phase rotation on the superimposed symbol to form a rotated symbol; and transmitting the superimposed symbol by using a first antenna and transmitting the rotated symbol by using a second antenna. With the embodiments of this disclosure, channel conditions of multiple pieces of user equipment may be differentiated, and gains of NOMA in a microcell may be fully brought into play.

Method and apparatus are provided for increasing transmit power in a sub-terahertz (sub-THz) communication system. An apparatus can determine a plurality of component carriers in a single frequency band. The single frequency band comprises an intra-band. The apparatus can configure a plurality of antenna arrays to serve the plurality of component carriers. The apparatus can transmit an output signal on the plurality of component carriers via the plurality of antenna arrays simultaneously.

Methods for transmitting over a wireless channel from a plurality of transmit chains are provided, as well as apparatuses for performing the methods. Each transmit chain has a variable gain power amplifier coupled to an antenna element. A subset of at least two transmit chains is selected from the plurality of transmit chains. A gain of at least one of the variable gain power amplifiers is set in accordance with the modulation scheme. Respective beams are transmitted with each transmit chain in the subset. Each respective beam represents a component of a modulated signal according to a modulation scheme, so that the beams combine over the wireless channel to form the modulated signal.

The present disclosure relates to an antenna arrangement and a method for radio transmission. The antenna arrangement comprises a pre-coder (310) connected to an antenna array (320). The antenna array (320) comprises a number N of antenna elements a.sub.i (321), i=1, 2, . . . , N, each antenna element a.sub.i being configured to receive a respective transmit signal component TX.sub.i from the pre-coder (310). The pre-coder (310) is configured to receive a number M<N of independent data streams s.sub.j, j=1, 2, . . . , M, and to generate the N transmit signal components, wherein the generating comprises suppressing a correlation between any two transmit signal components TX.sub.i1 and TX.sub.i2 received by antenna elements a.sub.i1 and a.sub.i2 arranged adjacently in the antenna array (320).

A first orthogonal frequency division multiplexing (OFDM) frame signal is generated that includes a grid of multiple frequency subcarriers and multiple time periods. An OFDM symbol is transmitted using multiple frequency subcarriers during a time period and includes known reference OFDM symbols assigned to corresponding time-frequency resource elements in the grid, Each resource element is defined by a one of the multiple frequency subcarriers and one of the multiple time periods. A second orthogonal frequency division multiplexing (OFDM) frame signal is generated that includes a grid of multiple frequency subcarriers and multiple time periods and includes known reference OFDM symbols assigned to corresponding time-frequency resource elements in the grid. The time-frequency resource elements in the grid assigned to the known reference OFDM symbols in the first OFDM frame signal are different from the time-frequency resource elements in the grid assigned to the known reference OFDM symbols in the second OFDM frame signal. The first OFDM frame signal is converted to a first radio signal and the second OFDM frame signal to a second radio signal. The first radio signal is transmitted from a first antenna and the second radio signal from a second, different antenna.

An antenna alignment method and system, with the system having a first device having N.sub.AT transmit beams and N.sub.AR receive beams. The system has a second device having N.sub.BT transmit beams and N.sub.BR receive beams. The first device transmits a signal to the second device according to a first cycle, and traverses switching of N.sub.AT transmit beams according to a third beam mode. The second device receives a signal from the first device according to the first cycle, and traverses switching of N.sub.BR receive beams according to a fourth beam mode, counts a receive signal power in each first cycle, and obtains a receive signal power corresponding to each receive beam according to the fourth beam mode, to determine that a receive signal power corresponding to an Sth receive beam is the highest, and uses the Sth receive beam as a receive beam.

An apparatus and method is disclosed in relation to antenna arrays. The method may include transmitting a reference signal to one or more remote user terminals from each of a plurality of sub-arrays of an antenna array, each sub-array including a quantity of radiating elements of the antenna array capable of establishing a backhaul link with a remote communications node. The method may also include receiving measurement signals from the one or more remote user terminals, indicative of one or more characteristics of the received reference signals. The method may also include selecting, based on received measurement signals, a first subset of the sub-arrays for backhaul communications with the remote communications node and a second subset of the sub-arrays, including one or more of the remaining sub-arrays, for access communications with the one or more remote user terminals.