Intra-symbol voltage modulation in a wireless communication circuit is disclosed. In a wireless communication circuit, a power amplifier circuit is configured to amplify a radio frequency (RF) signal based on a modulated voltage that tracks a time-variant input power of the RF signal. Herein, intra-symbol voltage modulation means that the modulated voltage can be adapted within a voltage modulation interval(s), such as an orthogonal frequency division multiplexing (OFDM) symbol duration. In embodiments disclosed herein, the voltage modulation interval(s) is divided into multiple voltage modulation subintervals and a respective voltage target is determined for each of the voltage modulation subintervals. Accordingly, the modulated voltage can be adapted in each of the voltage modulation subintervals according to the respective voltage target. By performing intra-symbol voltage modulation during the voltage modulation interval(s), the power amplifier circuit can operate with higher efficiency and prevent distortion (e.g., amplitude clipping) when amplifying the RF signal.

A serial receiver combines continuous-time equalization, analog interleaving, and discrete-time gain for rapid, efficient data reception and quantization of a serial, continuous-time signal. A continuous-time equalizer equalizes a received signal. A number N of time-interleaved analog samplers sample the equalized continuous-time signal to provide N streams of analog samples transitioning at rate reduced by 1/N relative to the received signal. A set of N discrete-time variable-gain amplifiers amplify respective streams of analog samples. A quantizer then quantizes the amplified streams of analog samples to produce a digital signal.

A digital transmitter architecture is disclosed to transmit (TX) multi-gigabit per second data signals on single carriers (SC) or orthogonal frequency division multiplexing (OFDM) carriers at millimeter wave frequencies in either one of a high-resolution modulation mode or a spectral shaping mode. The architecture includes a number of digital power amplifier (DPA) and modulation reconfigurable circuit segments to process individual bits of a data bit stream in parallel according to a specific circuit configuration corresponding to the selected TX mode using a multiplexer to switch between configurations.

A serial receiver combines continuous-time equalization, analog interleaving, and discrete-time gain for rapid, efficient data reception and quantization of a serial, continuous-time signal. A continuous-time equalizer equalizes a received signal. A number N of time-interleaved analog samplers sample the equalized continuous-time signal to provide N streams of analog samples transitioning at rate reduced by 1/N relative to the received signal. A set of N discrete-time variable-gain amplifiers amplify respective streams of analog samples. A quantizer then quantizes the amplified streams of analog samples to produce a digital signal.

A system and method are provided herein for managing an amplifier at an intermediate location in a twisted pair line between a digital subscriber line (DSL) access multiplexer and a customer premises equipment, for high data rate broadband operation. The system may include a DSL access multiplexer, an amplifier, a local communication interface and a host computer, programmed to execute an element management system service application.

A filtering device includes a low-pass filter (LPF), a noise estimation circuit and a first combining circuit. The LPF receives and filters a pre-filtering signal to generate an output signal of the filtering device. The noise estimation circuit estimates an estimated noise signal according to the output signal and the pre-filtering signal. The first combining circuit subtracts the estimated noise signal from an input signal of the filtering device to generate the pre-filtering signal.

A transmission apparatus includes a waveform processing circuit. The waveform processing circuit is configured to receive a modulated signal indicating each of values of pulses by one of four signal levels including first, second, third, and fourth signal levels ascending in this order. The waveform processing circuit is configured to output a signal corresponding to the modulated signal. A portion of the output signal corresponding to a portion of the modulated signal that transitions between the first and fourth signal levels, transitions between a first adjusted signal level different from the first signal level and a second adjusted signal level different from the fourth signal level. The transmission apparatus is configured to transmit a signal corresponding to the signal output from the waveform processing circuit through a wired communication path.

A receiver device according to an embodiment includes a equalizer, a sampler, and a controller. The equalizer receive a first signal. The equalizer boosts the first signal to output a resultant as a second signal. The sampler samples the second signal. The sampler outputs a sampling result of the second signal as a first digital signal. The controller executes adaptive processing for adapting an amount of boost of the first signal. In the adaptive processing, the controller is configured to: adjust an amount of boost for the equalizer based on inter-symbol interference of a part in the first digital signal, the part matching a data pattern of a set pattern filter; and dynamically change a pattern filter to be set according to the amount of boost for the equalizer.

An electronic device includes a processor, a modulator, and a power amplifier. The processor receives a baseband signal and executes a first ET shaping function on the baseband signal. The modulator receives the baseband signal, detects the magnitude of the baseband signal, and outputs the first voltage according to the magnitude of the baseband signal. The power amplifier outputs an amplified signal based on the first voltage. The first ET shaping function enables the relationship between the baseband signal and the first voltage to be Vpa=a|X|.sup.2+b. X is the baseband signal, Vpa is the first voltage, and a and b are constants. The look-up table records the relation curve between the power of the amplified signal and the first voltage when the second ET shaping function is used for envelope tracking.

An Open Radio Access Network Radio Unit (O-RU) including a Radio Frequency (RF) unit and a baseband unit, wherein: the baseband unit includes two or more digital signal processing units; the two or more digital signal processing units are configured to execute digital signal processing with respectively defined higher-level units; and the baseband unit is configured so as to be able to make some of the two or more digital signal processing units execute the digital signal processing and so as to be able to switch between the digital signal processing units that are made to execute the digital signal processing.