Techniques are provided for asset location using backscatter communication. A methodology according to an embodiment includes receiving a signal, generated by a tag associated with an asset in response to a broadcast signal. The broadcast signal comprising a base code sequence, and the received signal comprising the broadcast signal modulated by a tag code sequence and shifted in frequency by a frequency offset. The methodology further includes translating the received signal by the frequency offset to generate a translated received signal, demodulating the translated received signal to remove the tag code sequence modulation to generate a demodulated received signal, cross-correlating the base code sequence with the demodulated received signal to generate a correlation signal, and determining a range to the asset based on a time delay associated with a peak of the correlation signal. The tag may be located based on the range and an estimated direction to the tag.

Techniques are provided for asset location using backscatter communication. A methodology according to an embodiment includes receiving a signal, generated by a tag associated with an asset in response to a broadcast signal. The broadcast signal comprising a base code sequence, and the received signal comprising the broadcast signal modulated by a tag code sequence and shifted in frequency by a frequency offset. The methodology further includes translating the received signal by the frequency offset to generate a translated received signal, demodulating the translated received signal to remove the tag code sequence modulation to generate a demodulated received signal, cross-correlating the base code sequence with the demodulated received signal to generate a correlation signal, and determining a range to the asset based on a time delay associated with a peak of the correlation signal. The tag may be located based on the range and an estimated direction to the tag.

The present invention relates to a wireless communication method for suggesting a packet preamble structure for efficient communication in a wireless communication environment in which a legacy terminal and a non-legacy terminal are mixed, and a wireless communication terminal using the same.

For this, the present invention provides a wireless communication method including: generating a packet including a first preamble and a second preamble, wherein a first symbol and a second symbol of the second preamble are modulated using binary phase shift keying (BPSK); and transmitting the generated packet and a wireless communication terminal using the same.

The present invention relates to a wireless communication method for suggesting a packet preamble structure for efficient communication in a wireless communication environment in which a legacy terminal and a non-legacy terminal are mixed, and a wireless communication terminal using the same.

For this, the present invention provides a wireless communication method including: generating a packet including a first preamble and a second preamble, wherein a first symbol and a second symbol of the second preamble are modulated using binary phase shift keying (BPSK); and transmitting the generated packet and a wireless communication terminal using the same.

An method of determining a symbol according to a phase difference between input signals input in order of time may include calculating a first phase difference between a phase of a first previous signal received prior to a target signal and a phase of a second previous signal received prior to the first previous signal; calculating a second phase difference between a phase of the target signal and the phase of the second previous signal; calculating target likelihoods based on the first phase difference and the second phase difference; and determining an expected phase difference between the target signal and the first previous signal or an expected symbol for the target signal, based on the target likelihoods.

An method of determining a symbol according to a phase difference between input signals input in order of time may include calculating a first phase difference between a phase of a first previous signal received prior to a target signal and a phase of a second previous signal received prior to the first previous signal; calculating a second phase difference between a phase of the target signal and the phase of the second previous signal; calculating target likelihoods based on the first phase difference and the second phase difference; and determining an expected phase difference between the target signal and the first previous signal or an expected symbol for the target signal, based on the target likelihoods.

Methods, systems, and devices for wireless communications are described. A first wireless device may identify a set of data resource elements for transmitting data in one or more symbols periods. The first wireless device may generate, for the one or more symbol periods based on the set of data resource elements, a sequence of a set of pilot resource elements associated with the set of data resource elements, the sequence of the set of pilot resource elements including a demodulation reference signal. The first wireless device may transmit, to a second wireless device in the one or more symbol periods, the set of data resource elements and the set of pilot resource elements. The second wireless device may decode a first subset of the set of pilot resource elements based on a second subset of the set of pilot resource elements to determine the demodulation reference signal.

Methods, systems, and devices for wireless communications are described. A first wireless device may identify a set of data resource elements for transmitting data in one or more symbols periods. The first wireless device may generate, for the one or more symbol periods based on the set of data resource elements, a sequence of a set of pilot resource elements associated with the set of data resource elements, the sequence of the set of pilot resource elements including a demodulation reference signal. The first wireless device may transmit, to a second wireless device in the one or more symbol periods, the set of data resource elements and the set of pilot resource elements. The second wireless device may decode a first subset of the set of pilot resource elements based on a second subset of the set of pilot resource elements to determine the demodulation reference signal.

Orthogonal Time Frequency Space (OTFS) is a novel modulation scheme with significant benefits for 5G systems. The fundamental theory behind OTFS is presented in this paper as well as its benefits. We start with a mathematical description of the doubly fading delay-Doppler channel and develop a modulation that is tailored to this channel. We model the time varying delay-Doppler channel in the time-frequency domain and derive a new domain (the OTFS domain) where we show that the channel is transformed to a time invariant one and all symbols see the same SNR. We explore aspects of the modulation like delay and Doppler resolution, and address design and implementation issues like multiplexing multiple users and evaluating complexity. Finally we present some performance results where we demonstrate the superiority of OTFS.

Embodiments disclose a communication method and a device. The method includes: processing first information, where a processing process includes π/2 binary phase shift keying (BPSK) modulation, layer mapping, discrete Fourier transform (DFT) precoding, precoding, and orthogonal frequency division multiplexing (OFDM) waveform generation; and sending the processed first information to a network device. According to embodiments, a peak to average power ratio (PAPR) can be reduced.