Systems and methods are provided for measuring latency in a network device, which can include a signal generator, a sampler, a pulse detector, a timer, and a connector. The signal generator can define a signal profile. The sampler can sample the signal profile at a frequency of at least 4 GHz to generate a plurality of bits, each bit corresponding to a value of the signal profile during the sampling. The pulse detector can detect a change in the signal profile by detecting at least one change in the plurality of bits. The timer can time the change in value in the plurality of bits to provide at least one detection time measurement. The connector can electronically link the signal generator and the sampler to the network device to provide an external network path for transmitting a signal from the signal generator to the sampler via the network device.

Covert acoustic communications (CAC) through solid propagation channels that connect node pairs is achieved by encoding signals using spread spectrum coding techniques that position the encoded signal at a center frequency f.sub.c within a narrow frequency bandwidth BW.sub.NB in which the amplitude of the channel response H(f) between each node pair is relatively high. The channel response H(f), bandwidth BW.sub.NB and center frequency f.sub.c, and accordingly the signal data rate will adapt for each node pair and possibly each side of the node pair. A pre-distortion filter 1/H(f) pre-distorts the encoded signal over bandwidth BW.sub.NB to compensate for material and modal dispersion and multipath between the node pair. This technique avoids the problems associated with frequency dependent attenuation of the continuous solid path and allows for simultaneous transmission and reception of signals among the multiple node pairs.

An apparatus and method for providing a decision feedback equalizer are disclosed herein. In some embodiments, a method and apparatus for reduction of inter-symbol interference (ISI) caused by communication channel impairments is disclosed. In some embodiments, a decision feedback equalizer includes a plurality of delay latches connected in series, a slicer circuit configured to receive an input signal from a communication channel and delayed feedback signals from the plurality of delay latches and determine a logical state of the received input signal, wherein the slicer circuit further comprises a dynamic threshold voltage calibration circuit configured to regulate a current flow between output nodes of the slicer circuit and ground based on the received delayed feedback signal and impulse response coefficients of the communication channel.

Disclosed herein are an apparatus and method for removing a self-interference signal. The apparatus includes one or more processors and executable memory for storing at least one program executed by the one or more processors. The at least one program receives an upstream signal for removing self-interference, generates a downstream signal for channel estimation, replicates a self-interference signal in a time domain and a self-interference signal in a frequency domain using the upstream signal and the downstream signal, and removes the self-interference signal from the upstream signal using the replicated self-interference signal in the time domain and the replicated self-interference signal in the frequency domain.

Disclosed herein are an apparatus and method for decoding a bootstrap signal. The apparatus for decoding a bootstrap signal according to an embodiment of the present invention includes an operation unit for calculating the relative cyclic shift and the channel gain estimate of a received bootstrap signal and correcting the channel gain estimate using the relative cyclic shift, and a decoding unit for decoding the bootstrap signal using the corrected channel gain estimate.

Technology for simplified multimode signaling includes determining first and second self α-terms, cross coupling α-terms, and a delay skew term. For each communication link bundled in groups, the signals can be modulated as a superposition of the signals delayed and weighted based on the first and second self α-terms, the cross coupling α-terms and the delay skew term.

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present invention relates to a method and an apparatus for estimating an uplink channel of a base station in a wireless communication system, comprising the steps of: estimating a position of a wireless channel tap on the basis of a sounding reference signal (SRS) received from a terminal; determining an average power value of the wireless channel tap for each link between a transmitting antenna and a receiving antenna from and to which the SRS is transmitted; and estimating an effective channel frequency response (effective CFR) of a physical uplink shared channel (PUSCH) on the basis of the position of the wireless channel tap and the average power value of the wireless channel tap.

A method for estimating angle of arrival (AoA) of signals in a wireless communication system applied in an apparatus can estimate multiple AOAs of multiple paths on one channel tap using a transmitting scheme of beamformed multiple transmissions at the transmitting side. In the transmitting scheme, the equivalent channels for paths with multiple AoAs can be viewed as random, and a subspace-based algorithm is applied for AoA estimation.

Disclosed herein are an apparatus for analyzing a transmitter identification (TxID) signal and a method using the apparatus. The apparatus for analyzing the TxID signal includes a demodulator for decoding the bootstrap of a received signal; a cancellation unit for performing a host signal cancellation process for the received signal, thereby generating a host-signal-cancelled received signal; a correlator for calculating a correlation value between a signal corresponding to the host-signal-cancelled received signal and a signal corresponding to a TxID sequence; and a TxID profile analyzer for generating information about a channel between a transmitter corresponding to the TxID signal and a receiver using the correlation value.

There is disclosed a method of operating a radio node in a wireless communication network. The method includes communicating using a first set of one or more signaling beams, wherein communicating includes performing beamforming for one or more signaling beams of the first set based on a set of beam signaling characteristics. Each beam signaling characteristic pertains to a reference beam. The disclosure also pertains to related devices and methods.