Abstract: Some aspects of the present disclosure relate to detection of a Phase Hit and, upon detecting the Phase Hit, determining the magnitude and location of the Phase Hit. Detecting the Phase Hit may involve comparing a phase offset difference for successive pilot symbol to a detection threshold. Determination of the detection threshold may involve a Neyman-Pearson binary hypothesis testing (NP-BHT) approach. Once the magnitude and location of the Phase Hit are known, data symbols received after the location may be processed to remove the magnitude of the Phase Hit.

Abstract: The disclosed systems, structures, and methods are directed to a superposition based transceiver. The configurations presented herein employ a plurality of encoders configured to encode a plurality of input digital data streams, wherein each of the plurality of input digital data streams operates at different data rates, a plurality of modulators configured to modulate the plurality of encoded digital data input streams. In addition, a plurality of transmitter filters configured to perform up-sampling and filtering of the plurality of modulated digital data streams, and a signal mixer configured to combine the plurality of up-sampled and filtered digital data streams into a single aggregate digital data stream in a manner such that the single aggregate digital data stream contains spectral characteristics that substantially conform to both a central area and a skirt area of a unified spectral emission mask, as specified by European Telecommunications Standards Institute (ETSI).

Abstract: A laser sintering 3D printing thermal compensation system is provided and includes a controller and a heating device and a temperature field sensing device respectively connected to the controller, in which the temperature field sensing device is configured to determine a detection result by detecting within a printing region, the detection result includes a high temperature region and a relatively low-temperature region, and the controller is configured to control the heating device to heat the relatively low-temperature region for conducting thermal compensation, thereby reducing the temperature difference between the high temperature region and the relatively low-temperature region, and overcoming drawbacks of conventional arts having inaccurate control of the temperature field, causing interface defects due to temperature unevenness, and, consequently, greatly reducing the printing quality.

Abstract: The disclosed systems, structures, and methods are directed to a superposition based transceiver. The configurations presented herein employ a plurality of encoders configured to encode a plurality of input digital data streams, wherein each of the plurality of input digital data streams operates at different data rates, a plurality of modulators configured to modulate the plurality of encoded digital data input streams. In addition, a plurality of transmitter filters configured to perform up-sampling and filtering of the plurality of modulated digital data streams, and a signal mixer configured to combine the plurality of up-sampled and filtered digital data streams into a single aggregate digital data stream in a manner such that the single aggregate digital data stream contains spectral characteristics that substantially conform to both a central area and a skirt area of a unified spectral emission mask, as specified by European Telecommunications Standards Institute (ETSI).

Abstract: Methods and devices for dynamic sensitivity control (DSC) in wireless networks are provided by adapting a clear channel assessment threshold (CCAT) on a frame-by-frame basis, based on a destination of a head-of-line (HoL) frame in a medium access control (MAC) layer transmission queue. Two different ways of protecting the communication range among devices in a basic serving set (BSS) are disclosed. In the first way, frames received from a node's BSS are differentiated, at the MAC layer, from frames received from an overlapping BSS (OBSS), and different CCATs are used for frames received from the node's BSS versus frames received from OBSS(s). In the second way, a lower bound on the CCAT value is defined based on the average received signal strength indicator (RSSI) of frames previously received from the node's BSS, and the CCAT is periodically reset to its minimum value.

Abstract: The disclosed systems, methods, and structures are directed to LoS MIMO communications that optimize spectral efficiency and include a precoding module to multiply an input transmit data vector with a precoding matrix to generate a precoded transmit data vector, a gain matrix calculation module to generate a gain matrix having optimal gain values that maximize the spectral efficiency, a transmit signal processing unit to convert the precoded transmit data vector into an analog signal, a receive signal processing unit to receive the analog signal and convert the analog signal into a receive data vector, an equalization module, a channel estimation module to estimate channel information to generate an estimated channel, and a singular value decomposition module to decompose the estimated channel matrix. The gain matrix calculation module calculates the optimal gain values of the gain matrix by maximizing an objective function encompassing the channel information provided by a fed-back diagonal matrix.

Abstract: Phase noise (PN) is suppressed in an OFDM signal. In an initial iteration, an estimation of the PN samples in an OFDM signal vector is produced and the OFDM signal is demodulated using the initial estimation of the PN to generate constellation symbols for the initial iteration. In an additional iteration, an Inverse Fast Fourier Transform of constellation symbols generated in a preceding iteration is calculated to reconstruct preceding samples of the transmitted signal vector. A PN effect on the reconstructed samples is estimated. A next estimation of the PN in a next signal vector is produced based on the estimated PN effect on the reconstructed samples. The next signal vector is demodulated using the next estimation of the PN to generate constellation symbols for the additional iteration. A predetermined maximum number of additional iterations may be used.

Abstract: The present disclosure relates to data transmission between a node and peer nodes. Interference alignment techniques are used to mitigate interference between the nodes on a line of sight channel A data stream is exchanged in two transmissions between the node and a peer node. The two transmissions are formed according to an interference alignment precoding matrix. The node may include linearly aligned antennas. To mitigate further the interference between the node and the peer node, a pair of these antennas is selected for communication with the peer node as a function of a distance between the node and the peer node and as a function of a wavelength of the communication. Channel state information may be exchanged between the node and the peer node for precoding matrix selection and for antenna selection. The antennas used for communication between the nodes and the peer nodes may be beamforming antennas.

Abstract: Precoding is a technique that may be used in wireless communications when antenna spacing in a multiple-input multiple-output (MIMO) system is smaller than optimum spacing conditions. A precoding system and method are disclosed herein that distributes power among streams to trade-off increased data throughput and complexity of interference cancellation. Distributing power among streams may increase data throughput compared to singular value decomposition (SVD) precoding, but interference may be reduced compared to other methods that result in relatively high interference.

Abstract: Precoding is a technique that may be used in wireless communications when antenna spacing in a multiple-input multiple-output (MIMO) system is smaller than optimum spacing conditions. A precoding system and method are disclosed herein that distributes power among streams to trade-off increased data throughput and complexity of interference cancellation. Distributing power among streams may increase data throughput compared to singular value decomposition (SVD) precoding, but interference may be reduced compared to other methods that result in relatively high interference.

Abstract: Methods and devices for dynamic sensitivity control (DSC) in wireless networks are provided by adapting a clear channel assessment threshold (CCAT) on a frame-by-frame basis, based on a destination of a head-of-line (HoL) frame in a medium access control (MAC) layer transmission queue. Two different ways of protecting the communication range among devices in a basic serving set (BSS) are disclosed. In the first way, frames received from a node's BSS are differentiated, at the MAC layer, from frames received from an overlapping BSS (OBSS), and different CCATs are used for frames received from the node's BSS versus frames received from OBSS(s). In the second way, a lower bound on the CCAT value is defined based on the average received signal strength indicator (RSSI) of frames previously received from the node's BSS, and the CCAT is periodically reset to its minimum value.

Abstract: An apparatus includes an antenna, a memory and at least one processor. The memory stores data, which represents a beamforming profile for the antenna for wireless communication with a wireless station that has a fixed location. The processor(s), for a plurality of communication frames, configures the antenna based on the data for communications with the wireless station.

Abstract: Signals are received from antenna elements in an antenna array, and respective phase shifts are applied to the received signals. The respective phase shifts are relative to a channel phase shift associated with each antenna element, and correspond to side angles from a current antenna beam direction of the antenna array. Control signals based on the phase shifted signals are generated to control the channel phase shifts, to provide beamforming tracking.

Abstract: The present disclosure relates to data transmission between a node and peer nodes. Interference alignment techniques are used to mitigate interference between the nodes on a line of sight channel A data stream is exchanged in two transmissions between the node and a peer node. The two transmissions are formed according to an interference alignment precoding matrix. The node may include linearly aligned antennas. To mitigate further the interference between the node and the peer node, a pair of these antennas is selected for communication with the peer node as a function of a distance between the node and the peer node and as a function of a wavelength of the communication. Channel state information may be exchanged between the node and the peer node for precoding matrix selection and for antenna selection. The antennas used for communication between the nodes and the peer nodes may be beamforming antennas.

Abstract: An interactive vending system includes at least one vending machine, at least one portable device, a management server and two routers. The first router is connected to the vending machine, thereby connecting the vending machine to the internet. The portable device is connected to the internet. The second router is connected to the management server, thereby connecting the management server to the internet.

Abstract: A method and a system of evaluating traffic network reliability adapted to a traffic route network with sub-routes are provided.

Abstract: An apparatus includes an antenna, a memory and at least one processor. The memory stores data, which represents a beamforming profile for the antenna for wireless communication with a wireless station that has a fixed location. The processor(s), for a plurality of communication frames, configures the antenna based on the data for communications with the wireless station.

Abstract: A method and a system of evaluating traffic network reliability adapted to a traffic route network with sub-routes are provided.

Abstract: Signals are received from antenna elements in an antenna array, and respective phase shifts are applied to the received signals. The respective phase shifts are relative to a channel phase shift associated with each antenna element, and correspond to side angles from a current antenna beam direction of the antenna array. Control signals based on the phase shifted signals are generated to control the channel phase shifts, to provide beamforming tracking.

Abstract: An interactive vending system includes at least one vending machine, at least one portable device, a management server and two routers. The first router is connected to the vending machine, thereby connecting the vending machine to the internet. The portable device is connected to the internet. The second router is connected to the management server, thereby connecting the management server to the internet.