Exemplary embodiments include methods for adjusting transmission timing of a wireless communication device (UE) operating in a network including 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, and determining a second allowable timing adjustment range corresponding to a supplementary uplink (SUL) connection between the UE and the second BS. 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 UE's transmission timing to satisfy both the first and second ranges, and performing a corrective action if it is determined that a single TA value cannot be used. Embodiments also include first and second BS, and UEs, configured to perform the exemplary methods.

The application relates to a network access node (100) for a wireless communication system (500). The network access node (100) generates a control message (502) comprising frequency information associated with a modulation frequency used by the network access node (100) for modulation of symbols for transmission to a client device (300). The network access node (100) further transmits the control message (502) to the client device (300). Furthermore, the application also relates to a client device (300), corresponding methods, and a computer program.

Systems and methods for a non-data-aided (NDA) approach to advanced OFDM timing are provided. This approach allows for accurate OFDM symbol timing and synchronization by avoiding inter-symbol interference (ISI) in multipath environments where an earliest arriving signal may not be the strongest signal. The NDA approach may rely on generating and applying a bias correction to a combined correlation result of the multi-path signals.

Examples pertaining to reserving channel by cyclic prefix (CP) extension for alignment with a symbol boundary in mobile communications are described. An apparatus extends a CP of a symbol to result in an extended symbol that aligns with a timing reference. The apparatus then transmits the extended symbol.

A backhaul radio is disclosed that operates in multipath propagation environments such as obstructed LOS conditions with uncoordinated interference sources in the same operating band. Such a backhaul radio may use an advanced ARQ protocol, which uses an ACK_MAP, constructed by a combination of implicit and explicit signaling, and performs a combination of proactive and reactive retransmissions.

A backhaul radio is disclosed that operates in multipath propagation environments such as obstructed LOS conditions with uncoordinated interference sources in the same operating band. Such a backhaul radio may use adaptive beamforming and sample alignment at the transmitter to enhance the link performance. Such backhaul radios may communicate with each other to compute and apply optimal beamforming parameters for a particular propagation environment through a closed-loop feedback mechanism.

A securely pre-coded orthogonal frequency division multiplexing (SP-OFDM) system includes a transmitter configured to transmit a secure transmit signal through a dynamic constellation and a receiver configured to recover the original signal from the received secure transmit signal. It is aimed to reinforce the physical layer security of wireless communications under hostile interference. Potential applications include 4G and 5G communication systems, ASTC3.0 HDTV systems, WiFi systems, and any future wireless systems that utilize OFDM.

A method by which a terminal transmits a random access channel (RACH) signal in a wireless communication system comprises the step of transmitting the RACH signal to a base station according to an RACH format corresponding to a specific RACH subframe among previously defined RACH formats, wherein the method is configured such that a start point or an end point of the RACH signal in a time domain is differentiated according to whether a downlink control zone and an uplink control zone within the RACH subframe are punctured in a specific frequency band between the previously defined RACH formats.

Disclosed are a method and an apparatus for estimating a frequency offset in a wireless communication system. The method for estimating a frequency offset of the present disclosure comprises the steps of: acquiring a first symbol from which a cyclic prefix (CP) symbol of a received symbol is removed; acquiring a second symbol from which data having a length corresponding to a length of CP is removed at an end opposite to the end in which the CP is present in the received symbol; and estimating the frequency offset by using the first symbol and the second symbol.

A backhaul radio is disclosed that operates in multipath propagation environments such as obstructed LOS conditions with uncoordinated interference sources in the same operating band. Such a backhaul radio may use an advanced ARQ protocol, which uses an ACK_MAP, constructed by a combination of implicit and explicit signaling, and performs a combination of proactive and reactive retransmissions.