An optical communication system that includes a data transmitter. The data transmitter includes at least one optical emission device configured to output light energy as an optical beam having an operating bandwidth; a beam dividing device arranged to receive and divide the operating bandwidth of the optical beam into bandwidth portions of plural communication bands; a focusing grating; and a digital mirror array having a plurality of digital mirrors. In an imaging mode, the optical communication system is configured to perform hyperspectral imaging by setting all of the plurality of digital mirrors to positions that transmit all wavelengths of a communication band among the plural communication bands to the focusing grating.

The techniques described herein relate to methods, apparatus, and computer readable media configured to decode modulated data. A modulated signal is received. A format of the modulated signal is determined, wherein the format can include a first format comprising a first type of modulated signal, or a second format comprising the first type of modulated signal and a second type of modulated signal that is different than the first type. The modulated signal is decoded by determining a frequency shift amount based on the format of the modulated signal, shifting a frequency band of the first type of modulated signal from an original position to a shifted position, thereby shifting a center frequency of the first type of modulated signal by the frequency shift amount, and filtering, based on the format of the modulated signal, signals outside of the frequency band of the shifted first type of modulated signal.

A method allowing a receiver device of a wireless communication system to receive a useful signal emitted by an emitter device. The useful signal corresponding to a signal, the phase or frequency of which is modulated by a sequence of two-state symbols corresponding to a sequence of binary data. A temporal envelope of the useful signal is detected and compared to a preset threshold value. Transitions between consecutive useful-signal symbols are detected, on the basis of the result of the comparison. A sequence of binary data is extracted from the useful signal depending on the detected transitions.

An occurrence of a first set of n periods of a frequency-shift-keying (FSK)-modulated waveform is counted, where n is an integer number. The n periods of the FSK-modulated waveform in the first set have a first time duration. An occurrence of a second set of n periods of the waveform is counted. The n periods of the waveform in the second set have a second time duration. The first time duration is determined based on the counting of the first set of n periods. The second time duration is determined based on the counting of the second set of n periods. A difference between the first time duration and the second time duration is compared to a threshold. Changes in frequency of the waveform are detected based on the comparing of the difference between the first time duration and the second time duration to the threshold.

A method of transmitting a Physical Layer Convergence Procedure (PLCP) frame in a Very High Throughput (VHT) Wireless Local Area Network (WLAN) system includes generating a MAC Protocol Data Unit (MPDU) to be transmitted to a destination station (STA), generating a PLCP Protocol Data Unit (PPDU) by adding a PLCP header, including an L-SIG field containing control information for a legacy STA and a VHT-SIG field containing control information for a VHT STA, to the MPDU, and transmitting the PPDU to the destination STA. A constellation applied to some of Orthogonal Frequency Division Multiplex (OFDM) symbols of the VHT-SIG field is obtained by rotating a constellation applied to an OFDM symbol of the L-SIG field.

An example device in accordance with an aspect of the present disclosure includes a non-linear compensator, an interpolator, a demultiplexer, and a demodulator. The non-linear compensator is to correct a non-linearity of the input bitstream data to obtain linearized bitstream data. The interpolator is to convert a non-constant sample rate of the linearized bitstream data to obtain constant sample rate bitstream data. The demultiplexer is to demultiplex the constant sample rate bitstream data into a first waveform and a second waveform. The demodulator is to demodulate the first waveform and the second waveform.

An example device in accordance with an aspect of the present disclosure includes a non-linear compensator, an interpolator, a demultiplexer, and a demodulator. The non-linear compensator is to correct a non-linearity of the input bitstream data to obtain linearized bitstream data. The interpolator is to convert a non-constant sample rate of the linearized bitstream data to obtain constant sample rate bitstream data. The demultiplexer is to demultiplex the constant sample rate bitstream data into a first waveform and a second waveform. The demodulator is to demodulate the first waveform and the second waveform.

A method of transmitting a Physical Layer Convergence Procedure (PLCP) frame in a Very High Throughput (VHT) Wireless Local Area Network (WLAN) system includes generating a MAC Protocol Data Unit (MPDU) to be transmitted to a destination station (STA), generating a PLCP Protocol Data Unit (PPDU) by adding a PLCP header, including an L-SIG field containing control information for a legacy STA and a VHT-SIG field containing control information for a VHT STA, to the MPDU, and transmitting the PPDU to the destination STA. A constellation applied to some of Orthogonal Frequency Division Multiplex (OFDM) symbols of the VHT-SIG field is obtained by rotating a constellation applied to an OFDM symbol of the L-SIG field.

A receiver may receive a pulse width encoded signal. The receiver may determine a position of a transition of a pulse of the pulse width encoded signal by oversampling the pulse width encoded signal with respect to a quantization function. The receiver may determine that the position of the transition deviates from an expected position according to the quantization function by more than a predetermined range. The receiver may generate a signal, indicating an unexpected event, based on determining that the position of the transition deviates from the expected position. The receiver may detect an error in a message corresponding to the pulse width encoded signal based on a check value identified from the pulse width encoded signal. The receiver may adjust, based on the signal indicating the unexpected event, a value, corresponding to the position of the transition, to cause the error in the message to be corrected.

An input signal, including a process signal modulated with a sinusoidal signal, is converted from analog form to digital form. The converted input signal is filtered through a first programmable digital filter to extract the process signal. The converted input signal is filtered through a second programmable digital filter to extract the sinusoidal signal. A binary data signal is created based on the extracted sinusoidal signal.