Abstract: Embodiments provide a signal transmission method and apparatus. The method includes: modulating, by using a phase-shift keying PSK scheme with rotation of a first angle, at least a part of pilot information carried in at least one signaling symbol in a signaling field of a data packet, to obtain modulated pilot information; and sending, to a receive end, a data packet that carries the modulated pilot information. A modulation scheme different from a conventional modulation scheme is used in the embodiments to modulate pilot information carried in a signaling symbol in a signaling field of a data packet, so that a data packet format corresponding to the modulation scheme can be effectively detected at a receive end.

Abstract: Presented are MIMO communications architectures among terminals with enhanced capability of frequency reuse by strategically placing active scattering platforms at right places. These architectures will not depend on multipaths passively from geometry of propagation channels and relative positions of transmitters and those of receivers. For advanced communications which demand high utility efficiency of frequency spectrum, multipath effects are purposely deployed through inexpensive active scattering objects between transmitters and receivers enable a same frequency slot be utilized many folds such as 10×, 100× or even more. These active scatters are to generate favorable geometries of multiple paths for frequency reuse through MIMO techniques. These scatters may be man-made active repeaters, which can be implemented as small as 5 to 10 watt lightbulbs for indoor mobile communications such as in large indoor shopping malls.

Abstract: A digital pre-distortion system can inversely model a power amplifier of a system to linearize the transmitter. A complex baseband model for digital pre-distortion based on a narrowband signal assumption is unworkable for an ultra wide band Cable television application. Predistortion can use a true wide band model including real-valued basis terms, obtained from a real-valued signal. When raised to a power, both even and odd harmonics or both odd or even other non-linear terms are represented and negative frequency fold-over can be accounted for. A Hilbert transform can be applied. Compressed sensing can be used to reduce the number of basis terms in the true real wide band model to generate a sparse model. Sparse equalization can be added to improve the stability of the digital pre-distortion system.

Abstract: A Continuous Time Linear Equalizer (CTLE) and a method of operating a CTLE in a receiver for a Pulse Amplitude Modulation (PAM) signal are disclosed. The method includes initiating equalization using an initial equalization setting that is optimized to meet a first objective and responsive to a determination, shifting to a final equalization setting that is optimized to meet a second objective.

Abstract: Systems and methods for controlling a power amplifier includes combining a digital modulated data signal with a digital bias signal to generate a combined digital signal, the digital bias signal generated based on an envelope for the modulated data signal; converting, by a digital-to-analog converter, the combined digital signal into a combined analog signal, the combined analog signal comprising an analog modulated data signal and an analog envelope bias signal; and separating the analog modulated data signal and the analog bias signal onto separate signal paths, wherein the converting is performed using a single digital-to-analog converter.

Abstract: A Polar code rate matching method and a rate matching apparatus are disclosed. The method includes: dividing a system Polar code output by a Polar code encoder into system bits and parity bits; interleaving the system bits to obtain a first group of interleaved bits, and interleaving the parity bits to obtain a second group of interleaved bits; and determining a rate-matched output sequence based on the first group of interleaved bits and the second group of interleaved bits. System bits and parity bits are separately interleaved, to obtain a rate-matched output sequence, so that a sequence structure after interleaving is more random, which can reduce an FER, thereby improving HARQ performance, and ensuring reliability of data transmission.

Abstract: A transmitting device has a transmission data generating part and an output buffer part. The transmission data generating part transmits a data and a clock, which are to be transmitted to a receiving device, and outputs them to the output buffer part. The output buffer part includes a data transmitting part and a clock transmitting part. The clock transmitting part generates and transmits a clock intermittently phase-shifted. The data transmitting part transmits the data in sync with the clock transmitted from the clock transmitting part.

Abstract: An apparatus for powering an electrical circuit includes a first voltage input configured to receive power from a first voltage source, a second voltage input configured to receive power from a second voltage source, wherein the second voltage source has a lower voltage than the first voltage source, a voltage regulator connected to the first voltage input, and a voltage output configured to switchably receive power from the first voltage input through the voltage regulator or from the second voltage input.

Abstract: An example device in accordance with an aspect of the present disclosure includes at least one segment driver circuit having a first circuit and a second circuit, to receive input signals and provide output signals. A given segment driver circuit is to protect reliability and enable reconfigurability by selectively resetting coupling capacitors, and selectively cutting off the input signals from their respective segment driver circuit.

Abstract: An example device in accordance with an aspect of the present disclosure includes a direct current (DC) bias source coupled to a transmitter connector of a transmitter. The DC bias source is to apply, onto the transmission line, a DC bias signal isolatable from the transmission protocol by the receiver based on the receiver separating the DC bias signal from the transmission protocol without compromising the transmission protocol.

Abstract: A method of calibrating parameters for a polar transmitter (Polar TX) system includes receiving phase information derived from transmission information in a Polar TX for producing a radio frequency (RF) broadcast signal. An Inphase local oscillator (LO_I) signal and a quadrature phase local oscillator (LO_Q) signal are derived from a combination of a first signal and the phase information using a digital phase lock loop. A feedback receiver (FBR) receives the RF broadcast signal provided by the Polar TX. The LO_I signal and the LO_Q signal are mixed with the RF broadcast signal to obtain mixer output signals. RF path delay and IQ phase imbalance are concurrently determined as a function of the first signal and of the mixer output signals.

Abstract: Methods and apparatus for calibrating an antenna array are provided. A limited number of antenna elements of the array are operated to broadcast a signal. The signal carries information relevant to operation of a communication network, for receipt by other devices. By using one or a limited number of antenna elements, a radiation pattern covering a wide area is achieved. Concurrently, transmission of the broadcast signal is monitored using another one or more antenna elements of the array, operating in a receive mode. The monitored signal is used in an antenna array calibration operation. The procedure is repeated for various different transmitting and receiving antenna elements, resulting in a sequence of broadcasts using different parts of the array. The calibration results can be used to correct for operating errors such as phase shifter errors. The corrected phase shifters can then be used for beamforming during another phase of communication.

Abstract: Apparatus for determining a time of arrival of a message signal comprising: a quadrature mixer (13, 14) for mixing a received message signal with the signal of a local oscillator, wherein the received message signal comprises a binary sequence modulated by binary frequency shift keying with pulses corresponding to a first value at a first frequency and with pulses corresponding to a second value at a second frequency, wherein the local oscillator has a frequency between the first frequency and the second frequency; a time of arrival detector (18) for determining a time of arrival of the message signal on the basis of the output of the quadrature mixer (13, 14).

Abstract: A method for, at a transmitter, transmitting a signal to a receiver in a wireless communication system is disclosed. The method includes transmitting a first reference signal for omni-directionally providing a uniform reference beam to the receiver, transmitting a second reference signal for providing beams respectively corresponding to a predetermined number of sectors to the receiver, receiving, from the receiver, sector information selected based on the second reference signal and information about a beam gain difference between a beam corresponding to the selected sector and the reference beam, and performing beamforming for transmitting a signal to the receiver based on the sector information and the information about the beam gain difference.

Abstract: Embodiments relate to a concept for testing a transceiver device (302) which may be coupled to an antenna array (312), the antenna array (312) comprising at least two an antenna elements. It is provided (204) spatial radiation characteristics of an antenna reference or the antenna array (312) and at least one antenna element of the antenna array. It is determined (206), based on the spatial radiation characteristics and a predefined test quantity for a spatially unaware receiver or transmitter test of the transceiver device (302), a spatially aware test quantity for testing the transceiver device (302) using the spatially unaware receiver or transmitter test based on the determined spatially aware test quantity.

Abstract: Methods and apparatus to determine a level of inherent jitter for signals from a transmitter and a receiver, and modulate information onto a signal transmitted by the transmitter by using spot jitter (with bandwidth and center frequency modulation) and/or pulse width jitter in a region outside of a data region with inherent jitter to carry communication between systems.

Abstract: System and method for subsample time resolution signal alignment. First and second signals may be aligned by iteratively performing the following until a termination condition is met: current samples of the first and second signals may be acquired, a delayed copy of the current samples of the first signal may be generated and subtracted from the current samples of the first signal to generate a third signal, a delayed copy of the current samples of the second signal may be generated with a current subsample delay and subtracted from the current samples of the first signal to generate a fourth signal, and an alignment error may be generated based on the third and fourth signals and the current subsample may be delay adjusted accordingly. The iteratively adjusting may generate a subsample resolution delay aligning the second signal to the first signal. Subsequent samples the first signal and the second signal may be aligned and output per the subsample resolution delay.

Abstract: The invention discloses a transmitter comprising a pulse encoder for creating pulses from the amplitude of an input signal to the transmitter, a compensation signal generator for cancelling quantization noise caused by the pulse encoder, a mixer or I/Q modulator for mixing an output of the pulse encoder with the phase of an input signal to the transmitter, said output of the pulse encoder comprising the amplitude of the complex input signal plus the quantization noise caused by the pulse encoder, and an amplifier for creating an output signal from the transmitter. In the transmitter, a control signal (CA) for controlling a function of the amplifier comprises an output signal from the compensation signal generator, and an input signal to the amplifier comprises an output from the mixer having been modulated to a desired frequency.

Abstract: In one embodiment, an apparatus includes a clock channel to receive and distribute a clock signal to a plurality of data channels. At least some of the data channels may include: a first sampler to sample data; a second sampler to sample the data; and a deskew calibration circuit to receive first sampled data from the first sampler and second sampled data from the second sampler and generate a local calibration signal for use in the corresponding data channel. The apparatus may further include a global deskew calibration circuit to receive the clock signal from the clock channel, receive the first sampled data and the second sampled data from the plurality of data channels, and generate a global calibration signal for provision to the plurality of data channels. Other embodiments are described and claimed.

Abstract: Embodiments include systems and methods for detecting and correcting phased clock error (PCE) in phased clock circuits (e.g., in context of serializer/deserializer (SERDES) transmission (TX) clock circuits). For example, phased input clock signals can be converted into unit interval (UI) clocks, which can be combined to form an output clock signal. PCE in the output clock signal can be detected by digitally sampling the UI clocks to characterize their respective clock pulse widths, and comparing the respective clock pulse widths (i.e., PCE in the output clock signal can result from pulse width differences in UI clocks). Delay can be applied to one or more UI clock generation paths to shift UI clock pulse transitions, thereby adjusting output clock pulse widths to correct for the detected PCE. Approaches described herein can achieve PCE detection over a wide error range and can achieve error correction with small resolution.