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.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a base station (BS) may transmit a first set of synchronization signal block (SSB) burst sets with a first set of SSB parameters; and transmit a second set of SSB burst sets with a second set of SSB parameters, wherein the first set of SSB burst sets and the second set of SSB burst sets are transmitted in a common carrier. In some aspects, a user equipment (UE) may receive at least one SSB of the first set of SSB burst sets or the second set of SSB burst sets. Numerous other aspects are provided.

A method of configuring a preamble of a downlink frame for synchronization in data frame transmission of a 60 GHz wireless local area network system, the method comprising arranging a short preamble having a plurality of repetitive S symbols, and an IS symbol, and arranging a long preamble having a long cyclic prefix (CP) and a plurality of L symbols for frame synchronization and symbol timing by performing auto-correlation according to the length of window of the auto-correlation.

This disclosure presents distributed and decentralized synchronization for wireless transceivers. The disclosed system, device, and method achieve sub-nanosecond synchronization using low-cost commercial off the shelf software defined radios. By providing a decentralized mechanism that does not rely on a hierarchical master-slave structure, networks constructed as disclosed are robust to sensor drop-out in contested or harsh environments. Such networks may be used to create phased array radars and communication systems without requiring wired connections to distribute a common clock or local oscillator reference.

This disclosure provides systems, methods and apparatuses for detecting a presence of long training fields (LTFs) in packet extensions of high-efficiency (HE) packets. An apparatus requests a length of packet extensions to be used for a ranging operation. The apparatus receives an HE packet including a packet extension containing a selected number of LTFs based at least in part on the requested packet extension length. The apparatus performs the ranging operation based on a determination that the packet extension contains LTFs. In some aspects, the apparatus detects a presence of LTFs in the packet extension based on a bit provided in the HE packet. In some other aspects, the apparatus detects a presence of LTFs in the packet extension by extracting sequences from the packet extension.

Systems and methods for transmitting data using various Modulation on Zeros schemes are described. In many embodiments, a communication system is utilized that includes a transmitter having a modulator that modulates a plurality of information bits to encode the bits in the zeros of the z-transform of a discrete-time baseband signal. In addition, the communication system includes a receiver having a decoder configured to decode a plurality of bits of information from the samples of a received signal by: determining a plurality of zeros of a z-transform of a received discrete-time baseband signal based upon samples from a received continuous-time signal, identifying zeros that encode the plurality of information bits, and outputting a plurality of decoded information bits based upon the identified zeros.

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.

According to one embodiment, a method for a terminal to detect a sidelink signal in a wireless communication system comprises: a step in which the terminal performs sweeping on a predetermined signal by using a predetermined window for correlation; and a step for determining that the predetermined signal is a sidelink signal on the basis of a peak detected at a portion corresponding to a predetermined cyclic prefix (CP) while performing the sweeping, wherein the size of the predetermined window corresponds to the longest symbol duration among the respective symbol durations of a plurality of subcarrier spacings.

A frequency offset estimation method, device, communication device and storage medium are provided. The method comprises: acquiring a main peak and a secondary peak of a PRACH signal when detecting that an access signal is in the PRACH signal sent by the signal sending end, wherein the PRACH signal is composed of a preset number of identical leader sequences; determining a first frequency offset according to a peak value of the main peak and a peak value of the secondary peak; performing a frequency offset compensation on the PRACH signal according to the first frequency offset, to obtain a compensation sequence after the frequency offset compensation; and calculating a frequency offset between the compensation sequence and the leader sequences, to obtain a second frequency offset, so as to estimate a time delay of the access signal according to the second frequency offset.

Cyclic prefix (CP) detection and removal in a wireless communications system (WCS) is disclosed. More specifically, embodiments disclosed herein relate to removing a CP(s) from a random-access symbol(s) in an open radio access network (O-RAN) communications system in the WCS. The random-access symbol(s) includes the CP followed by a random-access sequence. As such, the CP must be removed before the random-access sequence can be detected and processed. In this regard, in embodiments disclosed herein, the O-RAN communications system is configured to determine a group delay associated with the random-access symbol(s) to thereby accurately determine a start of the CP in the random-access symbol(s). Accordingly, the O-RAN communications system can detect and remove the CP from the random-access symbol(s) based on the determined start of the CP. As a result, it is possible to preserve integrity of the random-access symbol(s) to thereby reduce random-access latency in the WCS.