Systems and methods for autonomous signal modulation format identification are disclosed. In an example embodiment of the disclosed technology, a method includes applying higher-order statistics to an input signal to identify the input signal's modulation format. The method may include applying higher-order statistics to the input signal to calculate higher-order cumulant values for the input signal as higher-order cumulants are indicative of a particular modulation format signature. The method may further include employing a decision tree to determine the modulation format of the input signal.

Disclosed herein are methods, devices, and system for beam forming and beam steering within ultra-wideband, wireless optical communication devices and systems. According to one embodiment, a free space optical (FSO) communication apparatus is disclosed. The FSO communication apparatus includes an array of optical sources wherein each optical source of the array of optical sources is individually controllable and each optical source configured to have a transient response time of less than 500 picoseconds (ps).

Systems and methods for autonomous signal modulation format identification are disclosed. In an example embodiment of the disclosed technology, a method includes mapping an input signal to Stokes space to generate a representation of the input signal in three-dimensional space. The method may further include determining the dimension of the representation and, based on the dimension, selecting a subset of modulation from a plurality of mutually exclusive subsets of modulation formats. Further, the method may include defining a cost function for identifying the modulation format from the selected subset and evaluating the cost function to identify the modulation format.

A transmitting and receiving device includes a controller, a driver, a specific pattern generator, a transmitting signal detector, an amplifier, a differential amplifier, an average current detector, and a received signal detector. In a non-signal period, the controller causes a current signal to be input from the driver to a laser diode and causes an optical signal to be output from the laser diode. When an optical signal of a specific pattern output from the other-side laser diode reaches a photodiode over a period of length that depends on an average value of a current signal output from the other-side photodiode that receives the optical signal, the controller adjusts a magnitude of the current signal input from the driver to the laser diode based on the length of the period of the optical signal of the specific pattern.

An improved method and system for locating a slicer threshold and phase is disclosed. A two-dimensional field of coordinates is defined using phase versus eye monitor magnitude. At each coordinate, the number of samples above the eye monitor magnitude are counted. Dividing by the total number of samples considered yields a ratio between 0 and 1. Each eye 0, 1, 2 (bottom, middle, top in a PAM4 system) has an ideal ratio (75%, 50%, 25%) assuming a balanced distribution of PAM4 levels. The rating (third dimension) at each coordinate is calculated to be (0.25−abs.value (actual_ratio−ideal_ratio)) limited to positive results only. The resulting ratings are summed over phase. The eye center is calculated using weighted average of the sums. The eye center is compared to the calibrated target to determine which way to move the slicer threshold.

A method (100) of encoding communications traffic bits onto an optical carrier signal in a pulse amplitude modulation, PAM, format. The method comprises: receiving (102) bits to be transmitted; receiving (104) an optical carrier signal comprising optical pulses having an amplitude and respective phases; performing (106) PAM of the optical pulses to encode at least one respective bit in one of a pre-set plurality of amplitudes of a said optical pulse; and performing (108) phase modulation of the optical pulses to encode at least one further respective bit in a phase difference between a said optical pulse and a consecutive optical pulse.

Disclosed herein are methods, devices, and system for beam forming and beam steering within ultra-wideband, wireless optical communication devices and systems. According to one embodiment, a free space optical (FSO) communication apparatus is disclosed. The FSO communication apparatus includes an array of optical sources wherein each optical source of the array of optical sources is individually controllable and each optical source configured to have a transient response time of less than 500 picoseconds (ps).

A light receiving device that includes a lens that collects a spatial light signal, a sensor array including a plurality of light receivers that receives the spatial light signal collected by the lens, and a reception unit that integrates an electric signal derived from the spatial light signal received by each of the plurality of light receivers and selects a light receiver that receives the spatial light signal. according to a voltage value of the integrated electric signal.

A transmitting and receiving device includes a controller, a driver, a specific pattern generator, a transmitting signal detector, an amplifier, a differential amplifier, an average current detector, and a received signal detector. In a non-signal period, the controller causes a current signal to be input from the driver to a laser diode and causes an optical signal to be output from the laser diode. When an optical signal of a specific pattern output from the other-side laser diode reaches a photodiode over a period of length that depends on an average value of a current signal output from the other-side photodiode that receives the optical signal, the controller adjusts a magnitude of the current signal input from the driver to the laser diode based on the length of the period of the optical signal of the specific pattern.

Disclosed in various embodiments of the present invention are a method and a device, the device comprising: an antenna module configured to form a plurality of beams having different directions; and a processor operatively connected to the antenna module, wherein the processor is configured to select a partial reception beam from among a plurality of reception beams, measure the reception power of the selected reception beam, determine a transmission condition through an artificial neural network on the basis of the measured reception power, and determine a reception beam for a communication connection by using the artificial neural network corresponding to the transmission condition. Various embodiments are possible.