Systems, methods and devices to generate tailored antenna radiation patterns for particular purposes are provided. The software-defined communication devices and systems dynamically reconfigure an antenna in a controlled and reversible manner, transmit and receive signals to a plurality of endpoints simultaneously without requiring moving elements, and control radiation patterns, making them useful and more versatile for many applications, especially in implementations concerning satellite communications. Communication links may be established with multiple endpoints simultaneously, and the position of the endpoints may be learned without knowing it in advance. The configurations described in the embodiments provide great versatility due to the possibility of processing the signal at each antenna element of the antenna.

Disclosed is a heterogeneous method of a Wi-Fi Internet of things (IoT), comprising: arranging at least one Wi-Fi IoT bridging device in a Wi-Fi IoT, the Wi-Fi IoT bridging device using a time division technique and communicating with at least one distant IoT device in a reduced data rate mode. Further disclosed is a heterogeneous IoT framework, comprising: a wireless router connecting to an IoT and supporting a standard Wi-Fi link; a bridging device connecting to the wireless router via the standard Wi-Fi link; and a Wi-Fi device in a reduced data rate mode connecting to the bridging device via the reduced data rate mode. The invention realizes bridging and swapping of data in a heterogeneous Wi-Fi IoT structure consisting of Wi-Fi IoT subnets having different baseband rates.

Embodiments are described of devices and methods for processing a signal using a plurality of vector signal generators (VSGs). A digital signal may be provided to a plurality of signal paths, each of which may process a respective frequency band of the signal, the respective frequency bands having regions of overlap. The gain and phase of each signal path may be adjusted such that continuity of phase and magnitude are preserved through the regions of overlap. The adjustment of gain and phase may be accomplished by a complex multiply with a complex calibration constant. The calibration constant may be determined for each signal path by comparing the gain and phase of one or more calibration tones generated within each region of overlap. Each signal path may comprise a VSG to convert the respective signal to an analog signal, which may be combined to obtain a composite signal.

An Interleaved Radio Frequency Digital-to-Analog Converter (RF DAC) suitable for use in cellular base stations and optimized to give both a wide RF tuning range and a wide RF bandwidth is disclosed. The RF DAC uses two levels of interleaving, the first providing a direct conversion path from Base Band (BB) to RF, and the second providing a variable interleaving factor through the use of summation to optimize the output bandwidth as a function of the RF center frequency. Digital Interpolation, including an arbitrary sample rate conversion filter, allows the RF DAC to operate from a wide range of possible BB sample rates and the DAC sample rate is a fixed ratio of the RF center frequency. As a result, the spurious outputs from the RF DAC are in known locations that are relatively easy to filter out, minimizing the frequency planning tasks required for a complete RF system design.

Various embodiments relate to a method and apparatus for a method for under sampling a RF carrier signal, the method including receiving, by an analog digital converter, the RF carrier signal, selecting, by a multiplexer, a clock signal which includes a first clock signal and a second clock signal which are phase shifted, receiving, by the ADC, the clock signal which has a frequency less that the frequency of the RF carrier signal, sampling, by the ADC, the RF carrier signal using the selected clock signal and demodulating, by a digital signal processor, the RF carrier signal into I channel data and Q channel data for I/Q demodulation.

An array-based Compressed sensing Receiver Architecture (ACRA) includes an antenna array with two or more antennas connected to two or more ADCs that are clocked at two or more different sampling rates below the Nyquist rate of the incident signals. Comparison of the individual aliased outputs of the ADCs allows for estimation of signal component characteristics, including signal bandwidth, center frequency, and direction-of-arrival (DoA). Multiple digital signal processing (DSP) techniques, such as sparse fast Fourier transform (sFFT), can be employed depending on the type of detection or estimation.

Embodiments are described of devices and methods for processing a signal using a plurality of vector signal generators (VSGs). A digital signal may be provided to a plurality of signal paths, each of which may process a respective frequency band of the signal, the respective frequency bands having regions of overlap. The gain and phase of each signal path may be adjusted such that continuity of phase and magnitude are preserved through the regions of overlap. The adjustment of gain and phase may be accomplished by a complex multiply with a complex calibration constant. The calibration constant may be determined for each signal path by comparing the gain and phase of one or more calibration tones generated within each region of overlap. Each signal path may comprise a VSG to convert the respective signal to an analog signal, which may be combined to obtain a composite signal.

An Interleaved Radio Frequency Digital-to-Analog Converter (RF DAC) suitable for use in cellular base stations and optimized to give both a wide RF tuning range and a wide RF bandwidth is disclosed. The RF DAC uses two levels of interleaving, the first providing a direct conversion path from Base Band (BB) to RF, and the second providing a variable interleaving factor through the use of summation to optimize the output bandwidth as a function of the RF center frequency. Digital Interpolation, including an arbitrary sample rate conversion filter, allows the RF DAC to operate from a wide range of possible BB sample rates and the DAC sample rate is a fixed ratio of the RF center frequency. As a result, the spurious outputs from the RF DAC are in known locations that are relatively easy to filter out, minimizing the frequency planning tasks required for a complete RF system design.

A communication system provides reliable wideband communications with reduced power consumption in a user equipment (UE) receiver. A UE may include receiver circuitry to receive a radio frequency (RF) signal from a wireless network and output an analog baseband signal. The RF signal includes M copies of a duplicated signal in a frequency domain. The analog baseband signal includes the M copies of the duplicated signal uniformly offset from one another in the frequency domain by a bandwidth F and including a gap between adjacent copies. The UE further includes an anti-aliasing analog filter an analog to digital converter (ADC). The ADC samples an output of the anti-aliasing analog filter at a sampling frequency selected to obtain a digital baseband signal comprising a combined digital copy of the M copies of the duplicated signal folded over each other.

A method, computer-readable storage medium, and signal processing apparatus for processing a plurality of input signals. The method includes receiving or generating a first intermediate signal and a second intermediate signal. The first and second intermediate signals are output to a signal analog-to-digital converter having a predetermined sampling frequency.