The present disclosure relates in general to devices, systems and methods for wireless communication, and in particular to communication using a proximity integrated circuit card (PICC). Example embodiments include a circuit (100) for a PICC, the circuit comprising an input stage (101), a decoding module (106) and a bias adjustment module (117), the bias adjustment module (117) configured to receive an output code from the decoding module and provide a bias adjustment signal to the input stage (101), the bias adjustment module (117) configured to iteratively tune the bias adjustment signal based on a measurement of the output code, with successive steps tuning the bias adjustment signal by a smaller amount until the output code is within a decoding range.

Advanced detectors for vector signaling codes are disclosed which utilize multi-input comparators, generalized on-level slicing, reference generation based on maximum swing, and reference generation based on recent values. Vector signaling codes communicate information as groups of symbols which, when transmitted over multiple communications channels, may be received as mixed sets of symbols from different transmission groups due to propagation time variations between channels. Systems and methods are disclosed which compensate receivers and transmitters for these effects and/or utilize codes having increased immunity to such variations, and circuits are described that efficiently implement their component functions.

An interleaver for combining at least two incoming signals into an analog output signal includes at least a first signal path and a second signal path. Each signal path has: an input terminal, a first gain stage for multiplying a signal coming from the input terminal with a first gain (a) to obtain a first signal, a mixer and a second gain stage for multiplying a signal coming from the input terminal with a second gain (b) before or after mixing it with a clock signal to obtain a second signal, an adder for adding the first and second signal to obtain an output signal of the signal path wherein the first and second gain are different from zero. The interleaver comprises an adder for adding the output signals from the signal paths.

Provided is an aerial-floating type communication relay apparatus capable of reducing a size and suppressing a movement of a cell footprint. The communication relay apparatus comprises an array antenna that has plural antenna elements forming a cell for performing a radio communication of a service link with a terminal apparatus, an information acquisition section that acquires information on at least one of a position and an attitude of the communication relay apparatus, and a control section that controls phases and amplitudes of plural transmission/reception signals transmitted/received via each of the plural antenna elements of the array antenna so as to fix the position of the cell footprint, based on the information on at least one of the position and the attitude of the communication relay apparatus.

Techniques are provided for signal detection based on the Gibbs phenomenon. A methodology implementing the techniques according to an embodiment includes transforming an input signal to the frequency domain and performing median filtering of amplitudes associated with frequency bins of the frequency domain transformed input signal. The median filtering is performed to attenuate longer duration or continuous signal components that may be present in the input signal. The method also includes identifying a sinc function main lobe in the median filtered signal, the sinc function associated with the Gibbs phenomenon. The method further includes detecting a discontinuity in the input signal based on the identified sinc function main lobe. The discontinuity is associated with a shorter duration signal component that is present in the input signal. Shorter duration signal components may include relatively narrow signal pulses and relatively fast rising or falling signal edges.

A magnetic field communication method and apparatus using a giant magnetoimpedance (GMI) magnetometer are disclosed. The magnetic field communication apparatus includes a GMI magnetometer configured to detect a first communication signal based on a received magnetic field signal, a first signal extractor configured to extract a second communication signal comprising a message signal from the first communication signal, a second signal extractor configured to extract a third communication signal by removing a magnetization frequency signal from the second communication signal, and a third signal extractor configured to extract the message signal by removing a carrier wave frequency signal from the third communication signal.

In some examples, a system includes a receiver configured to receive signals encoding first, second, and third messages in first, second, and third frequency bands. The system also includes a mixer configured to down-convert the received signals to intermediate-frequency (IF) signals based on a local oscillator signal. The system further includes at least one analog-to-digital converter configured to sample the IF signals at a sampling rate. A frequency band of the IF signals encoding the first message falls within a first Nyquist region, and a frequency band of the IF signals encoding the second message falls within a second Nyquist region. The first and second Nyquist regions are frequency ranges bounded by multiples of one-half of the sampling rate, and the second Nyquist region is different from the first Nyquist region. The system includes processing circuitry configured to determine data in the first, second, and third messages based on an output of the at least one analog-to-digital converter.

Capturing, extracting and storing narrowband IQ data for later processing enables timely and efficient analysis. As wideband capture of RF information includes noise and non-signal elements, the present invention detects, extracts and stores narrowband IQ signals for later assessment. By transforming a high-volume data stream to a collection of smaller narrowband signals with greatly reduced storage and on-board processing requirements the present invention facilitates the capability to analyze signals of interest in an otherwise denied environment.

Examples described herein include systems and methods which include wireless devices and systems with examples of mixing input data with coefficient data. For example, a computing system with processing units may mix the input data for a transmission in a radio frequency (RF) wireless domain with the coefficient data to generate output data that is representative of the transmission being processed according to the wireless protocol in the RF wireless domain. A computing device may be trained to generate coefficient data based on the operations of a wireless transceiver such that mixing input data using the coefficient data generates an approximation of the output data, as if it were processed by the wireless transceiver. Examples of systems and methods described herein may facilitate the processing of data for 5G wireless communications in a power-efficient and time-efficient manner.

A method for processing a radio signal includes producing first and second streams of audio samples; decimating the first and second streams of audio samples to produce first and second streams of decimated streams of audio samples; estimating a first offset value between corresponding samples in the first and second streams of decimated streams of audio samples; shifting one of the first and second streams of audio samples by a first shift value; decimating the first and second streams of audio samples to produce third and fourth streams of decimated audio samples; estimating a second offset value; determining a final offset value based on an intersection of ranges of valid results of the first and second offset values; and shifting one of the first and second streams of audio samples by the final offset value to align the first and second streams of audio samples.