A transmitter, a transmission system and a transmission method whereby AM-PM distortions can be compensated with high accuracy without affecting the functions of a predistortor, a ΔΣ modulator and so on. The transmitter includes: a baseband signal generation circuit that outputs the amplitude value and phase value of a baseband signal; a ΔΣ modulation circuit that performs a ΔΣ modulation of the outputted amplitude and phase values to output a pulse signal train; a power supply modulation circuit that supplies, to a pre-stage amplifier, a voltage determined in accordance with the outputted amplitude value; the pre-stage amplifier and a post-stage amplifier that amplify the outputted pulse signal train; and a filter circuit that generates an output signal from the pulse signal train as amplified and outputs the output signal. The power supply modulation circuit determines the voltage for canceling a phase error occurring in the post-stage amplifier.

A method by which a terminal demodulates a signal in a wireless access system according to one embodiment of the present invention comprises the steps of: receiving a modulation signal having a modulation order of 2.sup.m (m is a natural number); determining a first demodulation constellation arrangement corresponding to a k.sup.th (k is an even number among natural numbers of m or less) bit among m numbers of bits; determining a second demodulation constellation arrangement corresponding to an nth (n is an odd number among natural numbers of m or less) bit among the m numbers of bits; and demodulating the received modulation signal by using the first and second demodulation constellation arrangements, wherein the first constellation arrangement can have a pattern in which a square matrix having a size of 2.sup.(m/2+1)−(k/2) is repeated.

A system and method for transmitting data ultrasonically through biological tissue employs a network of a plurality of nodes, at least a portion of the nodes implantable within the biological tissue. At least one implanted node includes a transmitter having an orthogonal frequency division multiplex signal generator to encode an ultrasonic signal for transmission through the biological tissue to an ultrasonic receiver at another node.

Future generation 5G and multimode 4G and 3G mobile Modulation Format Selectable (MFS) wireless communication networks, cellular systems and devices with fingerprint signal authentication. Touchscreen and motion detectors are controlling mobile devices. Device receiving, demodulating and processing spread spectrum signal into processed Orthogonal Frequency Division Multiplexed (OFDM) signal. Mobile devices modulate and transmit processed OFDM signal. Processing spread spectrum or OFDM signals into Bit Rate Adaptable (BRA), Modulation Format Selectable (MFS) and cross-correlated in-phase and quadrature-phase Time Constrained Signal (TCS) wave form and Long Response (LR) filtered cross-correlated filtered baseband signals. Generation of video signals and processing video signals into cross-correlated signals and modulation and transmission of video cross-correlated signals. Photo camera generated photo signal in mobile device is processed with baseband location finder signal. The photo camera generated photo with baseband location finder signal is modulated and transmitted.

A communication link comprising: a first transceiver configured to transmit a first set of packets at a predetermined rate with a first error resistance level, store the transmitted data in a buffer, receive a retransmission request, and retransmit the relevant data using one or more packets encoded with a second error resistance level that is higher than the first error resistance level. And a second transceiver configured to receive the first set of packets, detect an erroneous packet, request retransmission of the erroneous packet, and forward the data received in the packets according to its original order approximately after a fixed delay.

Provided is a wireless communication device and a wireless communication method which can maintain compatibility with a plurality of communication schemes and send a response signal back within the allowed time specified by each communication scheme. The wireless communication device includes a radio receiving unit (120) that receives a packet having a format conforming to a first communication scheme and including a second format portion conforming to a second communication scheme using a higher frequency band than the first communication scheme and a first format portion excluding the second format portion, and a processing unit (160) that, outputs a response signal at completion of demodulation and decoding of the first format portion, regardless of whether demodulation and decoding of the second format portion are completed or not.

The present disclosure relates to control information sending methods in a wireless communications system. In one example waveform control information sending method, a network device obtains control information that includes uplink transmission waveform indication information, and sends the control information to a terminal. After receiving the control information, the terminal determines, based on the control information, a waveform used to send uplink data.

A system and method for transmitting data ultrasonically through biological tissue employs a network of a plurality of nodes, at least a portion of the nodes implantable within the biological tissue. At least one implanted node includes a transmitter having an orthogonal frequency division multiplex signal generator to encode an ultrasonic signal for transmission through the biological tissue to an ultrasonic receiver at another node.

A process for automatic electrical signal discovery and decoding includes detecting electrical disturbances in a serial or parallel bus, or from a transducer with a signal monitor and demodulating the signals by configuring a signal filter window on a frequency filter to maximize time domain signal resolution. Filtering out each frequency captured by the filter and adapting the signal filter window to increase frequency resolution until maximal frequency resolution is attained, demodulating the signal based on the detected encoding and transforming the demodulated signal into a binary code string for transcription to a channel code file.

Embodiments of the present invention provide a transmission status determining method, where the method includes: receiving, by a receive end device in a first time period, a first symbol sequence sent by a transmit end device; determining a first modulation parameter set according to the first symbol sequence; and determining, according to preset first mapping relationship information, a first transmission status corresponding to the first modulation parameter set as a transmission status of the transmit end device in a second time period, where the first mapping relationship information is used to indicate a one-to-one mapping relationship between N transmission statuses and N modulation parameter sets, the first modulation parameter set belongs to the N modulation parameter sets, and the second time period is later than the first time period.