A precoding process is performed on a first baseband signal and a second baseband signal to generate a first precoding signal and a second precoding signal. A pilot signal is inserted into the first precoding signal and phase change is performed on the second precoding signal. A pilot signal is inserted into the phase changed second precoding signal, and phase change is further performed on the phase-changed second precoding signal with the pilot signal inserted.

A wireless audio system including a transmitter using multiple antenna diversity techniques for different signal types is provided. Multipath performance may be optimized, along with improved spectral efficiency of the system.

Example communications methods and apparatus are described. One example method includes generating a first signal by a base station. The base station performs cyclic delay diversity (CDD) weighted processing on the first signal to obtain a second signal, and performs densified beam weighted processing on the second signal to obtain a third signal. The third signal is sent by the base station via an antenna. According to the foregoing method, the CDD weighted processing is performed on the first signal generated by the base station, so that time diversity can be obtained when the first signal is transmitted. In addition, the densified beam weighted processing is performed on the second signal obtained after the CDD weighted processing, so that a quantity of beams scanned by the base station can be increased.

The present disclosure relates to media access control (MAC) control element (CE) spatial relation information update for sounding reference signal (SRS). Specifically, a user equipment (UE) may receive a MAC CE from a network entity indicating a synchronization signal block (SSB) set and a SSB index within the SSB set as a reference signal (RS) for configuring spatial relation information of a SRS resource, wherein the UE is configured with a plurality of SSB sets corresponding to a plurality of physical cell identifications (PCIs) in a serving cell; and updating spatial relation information for one or more SRS resources within a SRS resource set based on the MAC CE.

Provided is a transmitter which improves the flexibility of SRS resource allocation without increasing the amount of signaling for notifying the cyclic shift amount. In the transmitter, with regard to each basic shift amount candidate group having a basic shift amount from 0 to N−1, a transmission control unit (206) specifies the actual shift amount imparted to a cyclic shift sequence used in scrambling a reference signal transmitted from each antenna port, said specification being performed based on a table in which cyclic shift amount candidates correspond to each antenna port, and based on setting information transmitted from a base station (100). With regard to basic shift amount candidates for shift amount X, the table differentiates between an offset pattern comprising offset values for cyclic shift amount candidates corresponding to each antenna port and an offset pattern corresponding to basic shift amount candidates of X+N/2.

Embodiments of the present disclosure describe methods and apparatuses for group based beam reporting and channel state information reference signal configuration in new radio systems.

A communications system including: first and second communications devices, each communications device including an antenna, a location system that determines a location of at least one of the first and second communications devices, a control system that receives a location indication indicative of the location from the location system, determines a relative location of the first and second communications devices and selectively controls a transmitting antenna of at least one of the first and second communications devices in accordance with the relative position to thereby optimise communication between the first and second communications devices.

A method for signal distortion mitigation in a communication device with at least one transmitter in a communication system, generating a signal for transmission for each of the at least one transmitter; performing Peak-to-Average Power Ratio (PAPR) reduction and spectrum shaping of each of the generated signal to provide a distorted signal for transmission; determining signal distortions of the distorted signals, and precoding the determined signal distortions. The method further generating a composite signal for transmission based on the precoded determined signal distortions and the generated signal for transmission, to provide a composite signal, and transmitting the composite signal to at least one receiving communication device, wherein the precoding enables mitigating the signal distortion impact on the at least one receiver.

A reception unit in a radio communication apparatus receives wirelessly a signal configured with a preamble from another radio communication apparatus. The synchronization detection unit uses the preamble included in the signal received by the reception unit to detect synchronization with another radio communication apparatus. The signal accumulation unit accumulates a signal extracted from the signal received by the reception unit based on a timing at which the synchronization is detected by the synchronization detection unit. The combining unit combines the signals accumulated in the signal accumulation unit in accordance with a blind adaptive array antenna algorithm. The demodulation unit demodulates the signals combined by the combining unit.

When transmitting signals from a plurality of base stations (broadcasting stations), the base stations include at least a first base station having a first antenna with a first polarization and a second base station having a second antenna with a second polarization that is different from the first polarization. Then, when the first base station transmits a signal from the first antenna having the first polarization, the second base station transmits the same signal as the first antenna of the first base station from a second antenna having the second polarization, at the same time.