Ziva Corporation | Date: 2014-09-04
Dynamic, untethered array nodes are frequency, phase, and time aligned/synchronized, and used to focus their transmissions of the same data coherently on a target or in the targets direction, using time reversal or directional beamforming. Information for alignment/synchronization may be sent from a master node of the array to other nodes, over non-RF links, such as optical and acoustic links. Some nodes may be connected directly to the master nodes, while other nodes may be connected to the master node through one or more transit nodes. A transit nodes may operate to (2) terminate the link when the alignment/synchronization information is intended for the node, and (2) pass through the alignment/synchronization information to another node without imposing its local clock properties on the passed through alignment/synchronization information. In this way, an end point node may be aligned/synchronized to the master node without a direct link between the two nodes.
Ziva Corporation | Date: 2015-03-23
Techniques, apparatus and systems for providing radio frequency wireless communications based on time reversal of the channel impulse response of an RF pulse in a transmission channel between an RF transmitter and an RF receiver to enhance reception and detection of an RF pulse at the RF receiver against various effects that can adversely affect and complicate the reception and detection of the RF pulse at the RF receiver.
Ziva Corporation | Date: 2015-10-27
Methods, apparatus, and articles of manufacture make Geolocation of a source transmitter more difficult or impossible. Scatterers common to a source transmitter and an intended receiver are identified using a variety of techniques, such as iterative time reversal (ITR) and Singular Value Decomposition (SVD) of a scatter matrix. The source transmitter then uses time reversal and knowledge of the signatures of the scatterers to focus its transmissions on one or more of the scatterers, instead of the intended receiver. The source transmitter may have multiple antennas or antenna elements. The source transmitter and/or the intended receiver may include antenna elements with Near-Field Scatterers to enable spatial focusing below the diffraction limit at the frequencies of interest. The source transmitter may be a plurality of ad hoc nodes cooperating with each other.
Agency: Department of Defense | Branch: Defense Advanced Research Projects Agency | Program: SBIR | Phase: Phase I | Award Amount: 148.87K | Year: 2013
Through the combined development of advanced waveguide architectures and meta-material synthesis techniques, Ziva's approach to meta- plasmonic interconnects promises to provide low loss photonic waveguides and devices with sizes comparable to electronic wires and circuits"light on a wire". Ziva's novel plasmonic waveguide architectures addresses the loss limitation of highly confined plasmonic waveguides by enhancing the performance of conventional MIM-plasmonic waveguides through implementation of a synthesized meta-material cladding surrounding the dielectric wave-guiding core of the structure. This idealized metal cladding (IMC)-MIM waveguide architecture promises to enable a new generation of passive and high speed active optical devices on a scale compatible with the size of electronics at the chip level. Meta-plasmonics enabled interconnects provide a perfect synthesis between conventional electronic and optical interconnect technologies where electronic waves are harnessed at optical frequencies. Ziva's IMC-MIM architecture is scalable and capable of supporting the waveguide pitch & #8804;100nm and<10dB/cm propagation loss requirements of next generation interconnect applications. This technique promises to have a revolutionary impact to computation, communications, nano-scale interconnects, imaging, and sensing.
Agency: Department of Defense | Branch: Defense Advanced Research Projects Agency | Program: SBIR | Phase: Phase I | Award Amount: 149.73K | Year: 2013
Strong RF network security necessitates a solution that spans the entire network stack from the physical channel (PHY) all the way to the end-user. Wireless PHY security is particularly important due wireless'inherently vulnerable public channel. Current cryptographic security techniques operate exclusively at higher networking layers, leaving exposure at the lower level PHY. Ziva has developed a powerful and comprehensive approach called RF Security with Time Reciprocal Techniques (RESTRICT) which proposes to leverage wireless channel reciprocity, enhancing the security of the RF physical layer while simultaneously removing much of the burdensome key management and distribution requirements, thus creating a system that compliments existing cryptography at higher network layers, resulting in higher overall security. Removal of key management requirements results in a system that can better scale to the expected sizes of future wireless networks. RESTRICT's security benefits are not solely applicable to the military; commercial wireless networks are already massively scaled and contain a host of discovered (and most likely undiscovered) security vulnerabilities. Increasing the PHY layer based security of commercial networks has the potential to decrease information theft that will only increase with the larger and larger amount of commerce transacted over wireless networks.