There is disclosed a method of operating a signaling radio node in a radio access network, the signaling radio node being adapted for transmitting on a plurality of layers utilizing an antenna arrangement; wherein the method comprises transmitting, on each of the plurality of layers, reference signaling in the same symbol time interval, wherein reference signaling on at least a first layer of the plurality of layers is shifted in time and/or phase relative to reference signaling on at least a second layer of the plurality of layers.

There are also disclosed related methods and devices.

A communication signal processing method comprises obtaining transmission delay value difference data relating to a difference in transmission delay values in a communication network that varies depending on whether or not a redundant path is used, obtaining redundancy status data relating to whether the redundant path is used, and controlling a parameter of a communication signal transmitted by the communication network based on the transmission delay value difference data when the redundant path is used as a result of determination according to the redundancy status data.

A cascade comprising multiple filters according to an embodiment comprises a filter, which includes a splitter configured to split an analog radio-frequency input signal into at least a first signal and a second signal, a first signal path configured to generate, based on the first signal, a time-delayed signal delayed by a predetermined delay time in the time domain, a second signal path configured to generate, based on the second signal, a phase-shifted signal shifted by a controllable predetermined phase shift in the phase domain, and a coupler configured to generate an output signal based on the time-delayed signal and the phase-shifted signal. Using an embodiment may improve a trade-off between frequency-related flexibility and frequency agility of a receiver infrastructure.

There is provided mechanisms for participating in beam management. A method is performed by a radio transceiver device. The method comprises receiving a reference signal from another radio transceiver device as part of participating in the beam management. The reference signal occupies time/frequency resources that extend over a first frequency interval. The reference signal is received in a reception beam. The reception beam has a frequency-dependent polarization over the first frequency interval.

A system for calibrating a payload of a satellite, the payload includes a multichannel transmitter or receiver comprising an antenna, one analogue processing chain per channel and a set of digital integrated circuits, the system comprising a calibration device configured to: acquire for all the channels of the transmitter or of the receiver, a digitized calibration signal, set a reference channel and, for each of the other channels, determine a relative complex gain between the channel and the reference channel, for a plurality of frequencies of the calibration signal, correct the relative complex gain of a relative gain of the antenna of the satellite between the channel and the reference channel, estimate a relative delay, estimate a relative phase difference for the set of frequencies, deliver a correction of the relative gain, phase difference and delay of the channel with respect to the reference channel for a set of frequencies.

There is provided mechanisms for participating in beam management. A method is performed by a radio transceiver device. The method comprises receiving a reference signal from another radio transceiver device as part of participating in the beam management. The reference signal occupies time/frequency resources that extend over a first frequency interval. The reference signal is received in a reception beam. The reception beam has a frequency-dependent polarization over the first frequency interval.

An antenna system including a retro-directive adaptive phased array antenna, comprised of a group of antenna modules. There is a phasing cell in each antenna module that adds a certain amount of phase shift to the wireless transmit and receive signals in order to generate a pair of retro-directive radiation beams, such that the wireless transmit and receive beams are aligned to each other. Each phasing cell synthesizes the phase shift values for the transmit and receive beams using only one phase shifter. Therefore, as a beam forming algorithm changes the receive beam forming coefficients (i.e. the phase shifters values) to steer the receiving beam, the transmit beam will be automatically aligned to that of receive beam for arbitrary transmit and receive frequencies.

Methods, devices, and apparatus to adapt operating parameters for satellite signal reception and transmission by a wireless device to mitigate effects of fading due to specular reflections are described herein. The wireless device measures received signal power levels and compares characteristics of the measurements over an observation duration to at least one fading criteria to determine whether to operate in a normal or adaptive mode. While operating in the adaptive mode, the wireless device alternates between high performance mode time periods and low performance mode time periods. The wireless device indicates to a ground station associated with the satellite in which operating mode the wireless device is operating via an uplink data message transmitted during a data cycle at the start of a high or low performance mode time period. The ground station schedules data transmissions accordingly during subsequent data cycles of the high or low performance mode time periods.

A method for selecting a cyclic shift diversity sequence, and a related apparatus are disclosed. The method includes: sending a frame by using a cyclic shift diversity (CSD) sequence, comprising: generating a frame, wherein the frame comprises a first data subframe conforming to a first communication mechanism and a third data subframe conforming to the first communication mechanism; sending the frame, wherein the first data subframe and the third data subframe are sent by using a cyclic shift diversity sequence. Under an EHT standard, a preferred cyclic shift diversity sequence can be obtained through selection from massive combinations of CSD values. Work efficiency is improved, and an operation burden is reduced.

A radio receiver component includes a first antenna line for receiving a first signal and a second antenna line for receiving a second signal. Each of the first signal and the second signal is a respective intermediate frequency (IF) signal produced by down-converting a respective radio frequency (RF) signal received by a respective antenna. The first antenna line includes a demodulator that receives the first signal and down-converts the first signal to produce one or more baseband signals, one or more variable baseband delay paths that delay the one or more baseband signals, a modulator that receives the one or more delayed baseband signals and up-converts the one or more delayed baseband signals to produce a third IF signal. The radio receiver component further includes a combiner that receives and combines the second signal and the third signal to produce a fourth signal.