Modulation

Modulation-related patent applications - as published by the U.S. Patent and Trademark Office (USPTO).

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NEW Device and method for modulated waveform encryption
May 25, 2017 - N°20170150348

Communication devices and a method of providing secure electronic content are general described. A plainmodulation containing user content is encrypted using a modulation key to form a ciphermodulation having a different magnitude and/or phase than the plainmodulation. Symbol representations of the plainmodulation and ciphermodulation in a qam constellation are different. The ciphermodulation symbol representation is in a location non-coincident ...
NEW Systems and methods for preventing distortion due to supply-based modulation index changes in an audio ...
May 25, 2017 - N°20170150257

In accordance with embodiments of the present disclosure, a method may include receiving a digital input signal at a first integrated circuit from a second integrated circuit, receiving a supply voltage at the first integrated circuit from the second integrated circuit, generating an analog output signal from the digital input signal, predicting a distortion of the analog output signal based ...
NEW The unconditional secure communication method based on beam-forming and security code
May 25, 2017 - N°20170149823

The present invention discloses an unconditional secure communication method based on beam-forming and security code, which comprises the following steps of: legitimate users send to the signal pie-encoded and modulated, meanwhile eavesdropper receives signals and calculates the bit error rate; computing security coding parameters, legitimate received users send pilot sequence, and legitimate sending users estimate legitimate channel, and extract information ...
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NEW Orthogonal time frequency space communication system compatible with ofdm
May 25, 2017 - N°20170149595

A system and method for orthogonal time frequency space communication and waveform generation. The method includes receiving a plurality of information symbols and encoding an n×m array containing the plurality of information symbols into a two-dimensional array of modulation symbols by spreading each of the plurality of information symbols with respect to both time and frequency. The two-dimensional ...
NEW Symplectic orthogonal time frequency space modulation system
May 25, 2017 - N°20170149594

A system and method for orthogonal time frequency space communication and waveform generation. The method includes receiving a plurality of information symbols and encoding an n×m array containing the plurality of information symbols into a two-dimensional array of modulation symbols by spreading each of the plurality of information symbols with respect to both time and frequency. The two-dimensional ...
NEW Method and apparatus for transmitting uplink signal
May 25, 2017 - N°20170149542

Disclosed herein are a method and an apparatus for transmitting an uplink signal. The method for transmitting an uplink signal includes: transmitting an uplink data in at least one symbol included in a short transmit time interval (stti) including 7 symbols or less; and transmitting a demodulation reference signal (dmrs) for the uplink data through an even-numbered subcarrier or an odd-numbered ...
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NEW Transmitting apparatus and mapping method thereof
May 25, 2017 - N°20170149519

A transmitting apparatus is disclosed. The transmitting apparatus includes an encoder to perform channel encoding with respect to bits and generate a codeword, an interleaver to interleave the codeword, and a modulator to map the interleaved codeword onto a non-uniform constellation according to a modulation scheme, and the constellation may include constellation points defined based on various tables according to ...
NEW Optical communication system and optical transmission device
May 25, 2017 - N°20170149511

The present invention relates to an optical communication system and an optical transmission device. By changing the ratio between the first segment and the segment or/and the amplitude of the second segment, the digital signal is modulated and transmitted in the form of an optical signal. Then a solar panel, which is used as the receiver for the optical ...
NEW Optical dual resonator modulation system and method, and optical dual resonator modulator therefor
May 25, 2017 - N°20170149508

Described are various embodiments of a dual optical modulator, system and method. In one embodiment, an optical modulator modulates an input optical signal having a designated optical frequency. The modulator comprises first and second tunable modulators operable around the optical frequency and operatively disposed between a bus waveguide path and an opposed waveguide path. The modulator further comprises a relative ...
NEW Optical transmitter and method for controlling the same
May 25, 2017 - N°20170149507

It is necessary to improve the signal quality of the optical signal emitted by a reconfigurable transmitter after a reconfiguration event, therefore, an optical transmitter according to an exemplary aspect of the invention includes a modulation means for modulating light by a driving signal with a reconfigurable format; a digital signal processing means for processing digital data to be transmitted ...
NEW Supporting distinct single-input single-output (siso) services in a multiple-input multiple-output (mimo) baseband circuit, particularly suited ...
May 25, 2017 - N°20170149478

One embodiment of the disclosure relates to supporting distinct single-input single-output (siso) services in a multiple-input multiple-output (mimo) baseband circuit, particularly suited for a distributed antenna system (das). In this regard, in one aspect, two communication paths in the mimo baseband circuit are reconfigured to distribute two distinct siso signals. A quadrature modulator modulates the two distinct siso signals to ...
NEW Method, based on composite modulation, of data transmission between power electronic devices without communication line
May 25, 2017 - N°20170149473

A method of data transmission between power electronic devices without a communication line involves generation of a digital signal in a data transmission process. The digital signal enables pwm modulation of specific data information via a composite modulation method. The composite modulation superimposes pwm modulation waves after modulating the pwm carrier frequency or conducting high-frequency modulation on the data. The ...
NEW Timing estimation in communication systems
May 25, 2017 - N°20170149471

Apparatus and methods for symbol timing synchronization in a direct-sequence spread-spectrum receiver may use non-coherent integration, thresholding, peak selection, and curve fitting to determine appropriate timing instants at which to select despread samples for further processing, such as demodulation and decoding. The curve fitting may be used to search backwards and/or forwards in time to obtain the timing instants.
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NEW Bit interleaver for low-density parity check codeword having length of 16200 and code rate of 4/15 and 16...
May 25, 2017 - N°20170149455

A bit interleaver, a bit-interleaved coded modulation (bicm) device and a bit interleaving method are disclosed herein. The bit interleaver includes a first memory, a processor, and a second memory. The first memory stores a low-density parity check (ldpc) codeword having a length of 16200 and a code rate of 4/15. The processor generates an interleaved codeword by interleaving the ldpc codeword ...
NEW Bit interleaver for low-density parity check codeword having length of 64800 and code rate of 2/15 and 64...
May 25, 2017 - N°20170149454

A bit interleaver, a bit-interleaved coded modulation (bicm) device and a bit interleaving method are disclosed herein. The bit interleaver includes a first memory, a processor, and a second memory. The first memory stores a low-density parity check (ldpc) codeword having a length of 64800 and a code rate of 2/15. The processor generates an interleaved codeword by interleaving the ldpc codeword ...
NEW Bit interleaver for low-density parity check codeword having length of 64800 and code rate of 3/15 and 16...
May 25, 2017 - N°20170149453

A bit interleaver, a bit-interleaved coded modulation (bicm) device and a bit interleaving method are disclosed herein. The bit interleaver includes a first memory, a processor, and a second memory. The first memory stores a low-density parity check (ldpc) codeword having a length of 64800 and a code rate of 3/15. The processor generates an interleaved codeword by interleaving the ldpc codeword ...
NEW Transmitting apparatus and interleaving method thereof
May 25, 2017 - N°20170149450

A transmitting apparatus is provided. The transmitting apparatus includes: an encoder configured to generate a low density parity check (ldpc) codeword by ldpc encoding based on a parity check matrix; an interleaver configured to interleave the ldpc codeword; and a modulator configured to map the interleaved ldpc codeword onto a plurality of modulation symbols, wherein the modulator is configured to ...
NEW Bit interleaver for low-density parity check codeword having length of 16200 and code rate of 3/15 and 16...
May 25, 2017 - N°20170149449

A bit interleaver, a bit-interleaved coded modulation (bicm) device and a bit interleaving method are disclosed herein. The bit interleaver includes a first memory, a processor, and a second memory. The first memory stores a low-density parity check (ldpc) codeword having a length of 16200 and a code rate of 3/15. The processor generates an interleaved codeword by interleaving the ldpc codeword ...
NEW Bit interleaver for low-density parity check codeword having length of 64800 and code rate of 4/15 and 256...
May 25, 2017 - N°20170149448

A bit interleaver, a bit-interleaved coded modulation (bicm) device and a bit interleaving method are disclosed herein. The bit interleaver includes a first memory, a processor, and a second memory. The first memory stores a low-density parity check (ldpc) codeword having a length of 64800 and a code rate of 4/15. The processor generates an interleaved codeword by interleaving the ldpc codeword ...
NEW Circuit arrangement for controlling power transistors of a power converter
May 25, 2017 - N°20170149428

A circuit arrangement for controlling power transistors of a power converter includes a logic circuit configured to generate a pulse-width modulation (pwm) signal and a clock generator configured to generate a clock signal. A first and a second isolator are configured to galvanically isolate transmission of the pwm signal and the clock signal into a high-voltage portion of the power ...
NEW Pulse width modulator and non-transitory computer readable medium for storing program for pulse width modulator
May 25, 2017 - N°20170149417

The pulse width modulator includes a subtraction unit configured to perform subtraction between an m value digital signal and a pulse width modulation signal; a feedforward filter unit configured such that a ΔΣ modulator to which an output signal of the subtraction unit is input and which includes integrators of a second order or higher is in cascade ...