A radio frequency transmitter including two digital to analog converter circuits. The two radio frequency digital to analog converter circuits are configured to operate independently or operating in unison. Operating independently includes each radio frequency digital to analog converter circuit of the two radio frequency digital to analog converter circuits receiving separate baseband signals and separate local oscillation inputs. Operating in unison includes both of the two radio frequency digital to analog converter circuits receiving a single baseband signal and a single local oscillation input. The two radio frequency digital to analog converter circuits are configured to change between operating independently and operating in unison.

A system and method for a high-speed transmitter comprising a precoder configured to receive a sequence of input symbols and to generate for each received symbol a respective recoded symbol is disclosed. The transmitter includes a recoding unit configured for recoding each current received PAM-M based on the recoded symbol immediately preceding the current recoded symbol at the recoding unit, a shift unit configured for determining a shift value for each current received symbol from the recoding unit based on the symbol received from the recoding unit and immediately preceding the current symbol at the shift unit; and Feed-Forward Equalizer unit for applying the shift values to the respective symbols received from the recoding unit to generate a corresponding sequence of output symbols to be transmitted in an output stream.

A method for signal transmission using precoded symbol information involves estimating a two-dimensional model of a communication channel in a delay-Doppler domain. A perturbation vector is determined in a delay-time domain wherein the delay-time domain is related to the delay-Doppler domain by an FFT operation. User symbols are modified based upon the perturbation vector so as to produce perturbed user symbols. A set of Tomlinson-Harashima precoders corresponding to a set of fixed times in the delay-time domain may then be determined using a delay-time model of the communication channel. Precoded user symbols are generated by applying the Tomlinson-Harashima precoders to the perturbed user symbols. A modulated signal is then generated based upon the precoded user symbols and provided for transmission over the communication channel.

Disclosed are a transmitter capable of cancelling simultaneous switching noise while ensuring low costs and a small area and a data transmission method in the same. The transmitter includes an encoder configured to convert input data of two levels (1 and 0) into data of three levels (+1, 0, and 1) and an output unit configured to output the data converted by the encoder. Here, the encoder adds 1 bit to the input data such that the number of bits corresponding to logic 1 becomes an even number. In addition, a specific correlation is established between currents or voltages corresponding to at least two levels of levels +1, 0, and 1 so that +1 and 1 corresponding to the logic 1 are alternately arranged and a current flowing through a power line or a ground line is constant regardless of the input data.

Disclosed are a transmitter capable of cancelling simultaneous switching noise while ensuring low costs and a small area and a data transmission method in the same. The transmitter includes an encoder configured to convert input data of two levels (1 and 0) into data of three levels (+1, 0, and 1) and an output unit configured to output the data converted by the encoder. Here, the encoder adds 1 bit to the input data such that the number of bits corresponding to logic 1 becomes an even number. In addition, a specific correlation is established between currents or voltages corresponding to at least two levels of levels +1, 0, and 1 so that +1 and 1 corresponding to the logic 1 are alternately arranged and a current flowing through a power line or a ground line is constant regardless of the input data.

The present invention discloses a modulation method and a modulation apparatus applicable to an OvXDM system, and an OvXDM system. On the one hand, an initial envelope waveform is virtually cut off, and a modulation-domain shift interval is calculated by using a virtual cutoff width of the initial envelope waveform, such that a symbol width obtained after modulation becomes smaller, and a transmission rate is improved; on the other hand, because the initial envelope waveform is virtually cut off but not really cut off, shifting and superimposition are still performed on an initial envelope waveform with tailing, such that the waveform still retains a good performance, such as a relatively narrow width and relatively fast side lobe attenuation, in a corresponding domain. Therefore, in the present invention, the good performance of the waveform is retained in the corresponding domain while the transmission rate is increased.

The present invention discloses a modulation method and a modulation apparatus applicable to an OvXDM system, and an OvXDM system. On the one hand, an initial envelope waveform is virtually cut off, and a modulation-domain shift interval is calculated by using a virtual cutoff width of the initial envelope waveform, such that a symbol width obtained after modulation becomes smaller, and a transmission rate is improved; on the other hand, because the initial envelope waveform is virtually cut off but not really cut off, shifting and superimposition are still performed on an initial envelope waveform with tailing, such that the waveform still retains a good performance, such as a relatively narrow width and relatively fast side lobe attenuation, in a corresponding domain. Therefore, in the present invention, the good performance of the waveform is retained in the corresponding domain while the transmission rate is increased.

The present disclosure pertains to a method for operating a transmitting node in a wireless communication network. The method comprises transmitting a signal based on Filter Bank Multi-Carrier, FBMC, filtering, wherein the signal comprises signal carrying pulses, g(t), the pulses having a sampling interval T, the pulses being transmitted with a separation interval of T, with 0<<1. The disclosure also pertains to related methods and devices.

The present disclosure pertains to a method for operating a transmitting node in a wireless communication network. The method comprises transmitting a signal based on Filter Bank Multi-Carrier, FBMC, filtering, wherein the signal comprises signal carrying pulses, g(t), the pulses having a sampling interval T, the pulses being transmitted with a separation interval of T, with 0<<1. The disclosure also pertains to related methods and devices.

The present application discloses a forward and backward smooth decoding method and device suitable for an OvXDM system, and a system. Importance weights of particles in a particle set corresponding to a symbol are calculated by using a forward process and a backward process, and screening is performed with reference to forward importance weights of particles and backward importance weights of particles, to output a final decoding sequence.