Data acquisition in a chirp spread spectrum (CSS) signal may use a data alignment indicator of a single down chirp signal or single upchirp signal. A receiver may receive part or all of a preamble comprising a sequence of training chirps for symbol alignment followed by a single opposite chirp for data alignment. Training chirps may be processed through a fast-Fourier transform (FFT), and the values from the FFT may be accumulated. The accumulated values may exceed a threshold for detection. The receiver may align, based on the received chirps of the preamble and exceeding the threshold, its symbol reception. Using this symbol alignment, the receiver may await a single opposite chirp after the sequence of training chirps. The single opposite chirp may indicate data alignment. Upon receipt of the opposite chirp, the receiver may start data acquisition based on chirps following the single opposite chirp.

In a broadband wireless communication system, a spread spectrum signal is intentionally overlapped with an OFDM signal, in a time domain, a frequency domain, or both. The OFDM signal, which inherently has a high spectral efficiency, is used for carrying broadband data or control information. The spread spectrum signal, which is designed to have a high spread gain for overcoming severe interference, is used for facilitating system functions such as initial random access, channel probing, or short messaging. Methods and techniques are devised to ensure that the mutual interference between the overlapped signals is minimized to have insignificant impact on either signal and that both signals are detectable with expected performance by a receiver.

A method, network node and wireless device for Scell activation/deactivation are disclosed. According to one aspect, a method includes determining if a serving cell of a wireless device (WD) is activated. The method further includes causing transmission of at least one medium access control (MAC) control element (CE) to deactivate a first semi-persistent channel state information (CSI) resource and a first semi-persistent (SP) CSI reporting configuration.

A method of searching a cell in a mobile station of a communication system in which a plurality of cells are grouped into a plurality of cell groups, each cell group including at least two cells, includes: detecting a primary synchronization signal and a secondary synchronization signal from a received signal; and identifying a cell based on a combination of the primary synchronization signal and the secondary synchronization signal. The secondary synchronization signal is related to the cell group to which the mobile station belongs and the primary synchronization signal is related to the cell to which the mobile station belongs within the cell group.

This disclosure provides systems, methods and apparatuses for indicating a data rate of a packet. The transmitting device may select the data rate of a data field of the packet to be transmitted to the receiving device, and may select a pattern to embed within a preamble of the packet based on the selected data rate. In some implementations, the transmitting device may select a first structure including a first number of instances of a sequence or its logical complement if the selected data rate is a low data rate, and may select a second structure including a second number of instances of the sequence or its logical complement if the selected data rate is a high data rate.

The disclosure relates to performing phase compensation at a transmitter. A processing device for a network access node generates a phase compensated modulation symbol based on at least one first modulation symbol and at least on one of a frequency offset parameter and a time offset parameter. The frequency offset parameter may be determined based on an offset between a reference frequency f0 and a DC (0 Hz) frequency such that the frequency offset parameter corresponds to the reference frequency f0. Also, the reference frequency f0 can be at least partly based on the carrier of up-conversion frequency used by the processing device and the reference frequency f0 can be the carrier for up-conversion frequency. The phase compensated symbol is transmitted to a receiver, such as a client device. Furthermore, the disclosure also relates to corresponding methods and a computer program.

A method for correcting frequency and/or phase in a communication link; a communication network; and a multiplexing and phase compensation unit are disclosed. The method for correcting frequency and/or phase in a communication link comprises receiving at least one reference transmission communicated via a wireless communication link; providing at least one identified characteristic by identifying at least one characteristic of the reference transmission; comparing said identified characteristic with at least one expected characteristic; and correcting a shift in frequency and/or phase of at least one communication signal communicated via the communication link based on a difference between the identified characteristic and the expected characteristic.

A modulation system for modulating a satellite uplink signal is described. The modulation system includes at least one computer device that includes an input interface, at least one software modulation engine, and at least one processing circuit. The input interface is configured to receive at least one input signal. The software modulation engine includes program code that is configured to modulate the at least one input signal when the software modulation engine is executed on the at least one processing circuit, thereby generating at least one IQ baseband data carrier (IQBBDC) signal based on the at least one input signal. Further, a modulation method for modulating a satellite uplink signal is described.

An apparatus, method and computer program is described comprising: obtaining time domain samples of a received radio frequency signal of a mobile communication system, wherein the radio frequency signal comprises a Physical Random Access Channel; determining an estimated power distribution for the time domain samples; determining a filtering threshold value at which a time domain sample is deemed to be due to interference, based on a defined probability level of the estimated power distribution; defining a filtering mask based on the time domain samples and the filtering threshold; and applying the filtering mask to the time domain samples to generate a filtered signal samples, wherein the filtering mask is configured to attenuate time domain samples that are above the filtering threshold.

The disclosure relates to a communication technique and a system for converging a fifth generation (5G) and subsequent communication system with Internet of things (IoT) technology to support a higher data transmission rate than a fourth generation (4G) system. The disclosure is applied to the intelligent service based on the 5G and subsequent communication technology and IoT-related technology. The reception device according to the disclosure receives orthogonal frequency division multiplexing (OFDM) signals through a plurality of antennas, aligns the received OFDM signals, converts at least one of the aligned reception signals into a designated symbol, estimates the data symbols of the reception signals based on the designated condition, and determines the data symbol of the reception signals by synthesizing at least one of the converted reception signals among the estimated reception signals.