Provided is a data transmission method, the method includes: sending, by a sending end, data to a receiving end on one or more orthogonal frequency division multiplexing (OFDM) symbols in a scheduling unit, wherein a time length of the scheduling unit is a length of two long term evolution (LTE) OFDM symbols having normal cycle prefixes and a subcarrier spacing of 15 kHz, the scheduling unit is formed by seven or eight OFDM symbols having a subcarrier spacing of 60 kHz, or the scheduling unit is formed by a first gap and seven OFDM symbols having a subcarrier spacing of 60 kHz, or the scheduling unit is formed by a second gap and a second gap and eight OFDM symbols having a subcarrier spacing of 60 kHz.

A communication device of handling at least one cyclic prefix (CP) comprises a storage unit for storing instructions and a processing means coupled to the storage unit. The processing means is configured to execute the instructions stored in the storage unit. The instructions comprise performing a first communication operation with a BS according to at least one first CP which has at least one first format; receiving a control signal indicating at least one second CP which has at least one second format or indicating no CP from the BS, wherein the at least one first format is different from the at least one second format; and performing a second communication operation with the BS according to the at least one second CP or using no CP according to the control signal.

Exemplary embodiments include methods adjusting transmission timing of a wireless communication device (UE) operating in a network comprising first and second base stations (BS). The methods include determining a first allowable timing adjustment range corresponding to an uplink (UL) connection between the UE and the first BS. The methods include determining a second allowable timing adjustment range corresponding to a supplementary uplink (SUL) connection between the UE and the second BS, wherein the SUL connection is not associated with a DL connection between the UE and the second BS. The methods include determining if a single timing advance (TA) value can be used to adjust the UEs transmission timing to satisfy both the first and second ranges, and performing a corrective action if it is determined that said single TA value cannot be used. Embodiments also include first and second BS, and UEs, configured to perform various aspects of the exemplary methods.

Systems (400) and methods for reducing a number of cyclostationary features in a transmitted signal. The methods comprise: obtaining by a transmitter a discrete-time IF signal comprising a sequence of samples all having a same sample duration; performing operations by a sub-sample dithering processing device of the transmitter to modify a sample timing of the discrete-time IF signal by decreasing or increasing a duration of at least one first sample of the sequence using a digital signal processing technique in a digital domain; converting the discrete-time IF signal to an RF signal; and transmitting the RF signal having a reduced number of cyclo stationary features.

Disclosed methods include transmitting an OFDM signal including a succession of frames spaced apart by a set of training symbols that are symmetric in time and each formed by a plurality of even-frequency sub-carriers, spaced by odd frequency zeros. The OFDM signal is received and sampled and timing metrics are determined. Local maximums, or peaks of the timing metrics are detected, and from the peaks a coarse time offset is determined. A correlation metric, at sample indexes within a region determined by the coarse time offset, is applied and, based on a peak, an estimated time offset is generated. A correlation metric of the estimated time offset is determined and, based on the correlation metric, an estimated frequency offset is generated.

Examples described herein include systems and methods which include wireless devices and systems with examples of cross correlation including symbols indicative of radio frequency (RF) energy. An electronic device including a statistic calculator may be configured to calculate a statistic including the cross-correlation of the symbols. The electronic device may include a comparator configured to provide a signal indicative of a presence or absence of a wireless communication signal in the particular portion of the wireless spectrum based on a comparison of the statistic with a threshold. A decoder/precoder may be configured to receive the signal indicative of the presence or absence of the wireless communication signal and to decode the symbols responsive to a signal indicative of the presence of the wireless communication signal. Examples of systems and methods described herein may facilitate the processing of data for wireless communications in a power-efficient and time-efficient manner.

A transmitter transmitting payload data using Orthogonal Frequency Division Multiplexed (OFDM) symbols, including: a frame builder configured to receive the payload data and to receive signalling data to use in detecting and recovering the payload data at a receiver, and to form the payload data with the signalling data into frames for transmission; a modulator configured to modulate a first OFDM symbol with the signalling data and to modulate one or more second OFDM symbols with the payload data; a signature sequence processor circuit providing a signature sequence; a combiner circuit combining the signature sequence with the first OFDM symbol; a prefixing circuit prefixing a guard interval to the first OFDM symbol to form a preamble; and a transmission circuit transmitting the preamble and the one or more second OFDM symbols. The guard interval is formed from time domain samples of a part of the signature sequence.

A method and system for obtaining system information from a plurality of cells in a network based on a downlink (DL) synchronization signal block (SB) burst used by the plurality of cells to transmit information to user equipment (UE) wherein the DL SB burst includes a plurality of SB's each containing synchronization information for one or more of the plurality of cells.

A wireless communication device identifies a set of multiple different subcarrier spacings which are supported for transmission of synchronization signals. From the set of different subcarrier spacings, the wireless communication device selects a subset of one or more subcarrier spacings. Further, the wireless communication device receives signals from the wireless communication network. On the basis of the subcarrier spacings of the subset, the wireless communication device monitors the received signals for synchronization signals.

Embodiments disclose an automatic gain control method and a communications device in a wireless local area network. The method includes generating a physical layer packet, where the physical layer packet includes a high efficiency long training field, the high efficiency long training field includes N symbols, a length of a cyclic prefix (CP.sub. of a first symbol in the N symbols is greater than or equal to a minimum length required by a receiver device to perform automatic gain control (AGC) estimation, and N is a positive integer. The method also includes sending the physical layer packet to the receiver device.