Abstract: A scalable algorithm may be used for determining beam/nullforming weights with minimal computation and minimal coordination between elements or subarrays. The algorithm may beamform large numbers of elements without channel state information and without knowing the signal of interest. The algorithm may optimize the signal-to-interference-plus-noise ratio of signals received at an array. The algorithm may remove the requirement for explicit channel state information (CSI) or for iterative co-estimation of CSI, remove the requirement for coordination with or knowledge of signals transmitted from null targets, and/or remove the requirement for knowledge of the number of targets by estimating and optimizing overall SINR, rather than jointly optimizing each received signal. The algorithm interprets the N-element arrays view of the signal-to-interference-plus-noise ratio as a N-dimensional gradient ascent.

Abstract: A communication system and modulator for multiplexing two RF functions onto a shared antenna use a quadrature phase shift keying scheme (QPSK) scheme where each function is modulated using a binary PSK (BPSK) modulation and rotated onto a virtual axis before being combined. A transition enabler determines when the lower rate RF function is permitted to transition between binary states. When the higher rate RF function is repeated for a given cycle, the lower rate RF function may not interfere, and is allowed to transition. RF functions may be scaled according to the priority of each signal.

Abstract: A method may use hybrid-TDMA/FDMA frames to synchronize participating nodes to an orchestrator node of a virtual antenna array as the virtual antenna array transmits to a target node. The virtual antenna array is formed by the orchestrator node and the participating nodes. The orchestrator node synchronizes the participating nodes periodically using the hybrid-TDMA/FDMA frames. The virtual antenna array directs joint communications toward and receives communication from the target node. The communication from the target node may be used to learn channel state information (CSI) between the virtual antenna array and the target node. The nodes may include software-defined radios which execute the hybrid-TDMA/FDMA frames. The hybrid-TDMA/FDMA frames may include concurrent transmissions of signal data and metadata. The hybrid-TDMA/FDMA frames may decouple the duty-cycle from the number of nodes.

Abstract: A random radio frequency (RF) signal generator includes a true random number generator (TRNG) that generates an output seed used by a digital signal generator to perform random operations to generate a random RF signal using an RF front-end. The digital signal generator includes a seed slicer to slice the output seed into slices of random bits. A pseudo-random number generator (PNG) controller uses slices to select a PNG of a bank of PNGs to generate random output using a PNG select multiplexer for a first number of clock counts. A signal processing controller uses slices to adjust a digital signal generate from the random output. A hardware controller uses slices at apply a hardware adjustment to a hardware component within the RF front-end to further vary the digital signal to generate the random RF signal.

Abstract: A radio system is used for adaptive digital beamforming in a phased antenna-array. The radio system scales with large numbers of antenna elements in a phased array. The radio system uses a distributed computing method that is inherently scalable with large numbers of the antenna elements. The radio system includes a digital beamformer. The digital beamformer is an analog combiner, digital beamformer. The digital beamformer includes element processing hardware (EPH) which perform the distributed computing.

Abstract: A resource allocation system receives user requests for system resources over time. The system records factors such as number of resource requests, total usage time, etc., and preempts earlier requests in favor of later requests based on those factors. The resource allocation system tracks metrics in real-time and establishes dynamic preemption thresholds based on usage over time. Preemption thresholds may be specific to individual users.