An augmented reality (AR) system time-reverses a detection signal and a data signal based on a location detection signal, and outputs the time-reversed detection signal and data signal. Accordingly, data transmission efficiency may increase.

A wireless communications and imaging system is described. The system includes a receiver and a transmitter. The receiver includes a synchronized array of clocks, wherein a speed of time measured by each one of the clocks in the synchronized array of clocks relative to the other clocks is tracked. The transmitter includes a constellation of masses. A relative position of individual ones of the masses of the constellation of masses (with respect to one another) encodes digital data that is sensed by the receiver in the form of a gravity field change that causes a difference in the speed of clocks measured and utilized by the quantifiable receiver which clock speed differential corresponds to and enables the replication of the original digital data set that was input into the transmitter.

A wireless communications and imaging system is described. The system includes a receiver and a transmitter. The receiver includes a synchronized array of clocks, wherein a speed of time measured by each one of the clocks in the synchronized array of clocks relative to the other clocks is tracked. The transmitter includes a constellation of masses. A relative position of individual ones of the masses of the constellation of masses (with respect to one another) encodes digital data that is sensed by the receiver in the form of a gravity field change that causes a difference in the speed of clocks measured and utilized by the quantifiable receiver which clock speed differential corresponds to and enables the replication of the original digital data set that was input into the transmitter.

According to an aspect of the present disclosure there is provided a communication device comprising circuitry configured to modulate a four-dimensional input signal by combining the four real-valued signal components of the input signal into a transformed signal and multiplying the transformed signal by carrier signals using two different carrier frequencies to obtain a transmit signal, and transmit the transmit signal.

The present invention is directed to data communication system and methods. More specifically, various embodiments of the present invention provide a communication interface that is configured to transfer data at high bandwidth using nDSQ format(s) over optical communication networks. In certain embodiments, the communication interface is used by various devices, such as spine switches and leaf switches, within a spine-leaf network architecture, which allows large amount of data to be shared among servers.

A carrier-phase recovery method includes: (i) applying a first carrier-phase recovery algorithm to complex-valued symbols of a signal received by a product detector, yielding coarse phase-estimates, the signal being modulated per an M-QAM scheme; (ii) modelling the coarse phase-estimates as a weighted sum of M probability-density functions of an M-component mixture model; (iii) optimizing the M probability-density functions with an expectation-maximization algorithm to yield M optimized probability-density functions; (iv) mapping, based on the M optimized probability-density functions, the coarse phase-estimates to one of M symbols corresponding to the QAM scheme, each coarse phase-estimate mapped to a same symbol belonging to a same one of M clusters; (v) applying a second carrier-phase recovery algorithm to each of the M clusters to generate refined phase-estimates each corresponding to a respective coarse phase-estimate; and (vi) mapping, based on the M optimized probability-density functions, each refined phase-estimate to one of the M symbols.

A system comprises: a polarization state aligner (PSA) comprising: an input port; a first polarization beam splitter (PBS) coupled to the input port; a first phase shifter (PS) coupled to the first PBS; a first polarization rotator (PR) coupled to the first PBS; a first beam splitter (BS) coupled to the first PS and the first PR; a first output port coupled to the first BS; and a second output port coupled to the first BS.

Methods, systems, and devices are described for mitigating an unwanted increase in a coding rate of a wireless communication signal. A plurality of symbols including a transmitted codeword is received. The plurality of symbols including a first group of data symbols with a first modulation and coding scheme and a second group of data modulated pilot symbols with a second modulation and coding scheme. Applicable demodulation schemes are adaptively switched for each group of the plurality of symbols. The second group of data modulated pilot symbols are used in lieu of pilot symbols. The second modulation and coding scheme is a more reliable modulation and coding scheme than the first modulation and coding scheme.

A wireless communications and imaging system is described. The system includes a receiver and a transmitter. The receiver includes a synchronized array of clocks, wherein a speed of time measured by each one of the clocks in the synchronized array of clocks relative to the other clocks is tracked. The transmitter includes a constellation of masses. A relative position of individual ones of the masses of the constellation of masses (with respect to one another) encodes digital data that is sensed by the receiver in the form of a gravity field change that causes a difference in the speed of clocks measured and utilized by the quantifiable receiver which clock speed differential corresponds to and enables the replication of the original digital data set that was input into the transmitter.

A wireless communications and imaging system is described. The system includes a receiver and a transmitter. The receiver includes a synchronized array of clocks, wherein a speed of time measured by each one of the clocks in the synchronized array of clocks relative to the other clocks is tracked. The transmitter includes a constellation of masses. A relative position of individual ones of the masses of the constellation of masses (with respect to one another) encodes digital data that is sensed by the receiver in the form of a gravity field change that causes a difference in the speed of clocks measured and utilized by the quantifiable receiver which clock speed differential corresponds to and enables the replication of the original digital data set that was input into the transmitter.