Abstract: Presented are cloud storage architectures for private data among terminals with enhanced capability of data privacy and survivability. Pre-processing for storing data in IP cloud comprises: transforming multiple first data sets into multiple second data sets at an uploading site, wherein one of said second data sets comprises a weighted sum of said first data sets; storing said second data sets in an IP cloud via IP connectivity; and storing multiple data storages linking to said second data sets at said uploading site. In accordance with an embodiment post processing may comprise recovering said second data sets at a downloading site via IP network.

Abstract: A communication system includes a transmitter, one or more active scattering platforms, and one or more remote receivers. The transmitter includes a beam forming network for transforming M signals into a set of shaped beams which are radiated toward the active scattering platforms by transmitter antenna elements. The active scattering platforms receive and re-radiate one or more of the radiated shaped beams toward the receivers. The beam forming network optimizes composite transfer functions under performance constraints. Each composite transfer function is a linear combination of transfer functions. Each transfer function characterizes propagation paths from one transmitter antenna element to one receiving antenna element. Each receiving antenna element is identified by a user element identification index in the transfer functions. Each receiver is identified by a user identification index.

Abstract: A broadband linear processing system includes a pre-processing module and a set of M linear processors coupled to the pre-processing module, M being an integer greater than 1. The pre-processing module includes a wavefront multiplexer having M input ports and M output ports. The wavefront multiplexer receives M input signals at the M input ports, performs a wavefront multiplexing transform on the M input signals and outputs M narrowband signal streams at the M output ports. The wavefront multiplexing transform has an inverse. Each of the M linear processors receives and processes a corresponding one of the M narrowband signal streams, and outputs a corresponding one of M processed narrowband signal streams.

Abstract: A system for remotely generating beams to be concurrently radiated by a downlink broadcast antenna array having N array elements onboard a satellite, N being an integer>1, includes a ground station comprising a digital beam forming (DBF) processor, a wavefront multiplexer, and D/A converters. The DBF processor applies beam weight vectors which include information on a footprint and a pointing direction of a beam to a content data stream and generates N data streams. The wavefront multiplexer having M input ports and M output ports, M being an integer?N, receives the N data streams and M?N diagnostic streams at the M input ports, performs a spatial transform on the M input streams to generate M output streams. The D/A converters convert respectively the M output streams to M baseband signals which are then transformed into an uplink signal to be transmitted to the satellite.

Abstract: A system for communications via first and second transponders includes a transmitter in a ground hub and a VSAT on a moving platform. The transmitter includes a beam shaping processor for forming concurrently first and second beams to transmit first and second streams of data to the VSAT via the first and second transponders, respectively. The VSAT comprises an array antenna, a beam forming network, Rx/Tx processors, and a mini-hub. The array antenna includes N discrete elements arranged as a distributed array and mounted on a fixed structure, N>1. The beam forming network, remotely located from the array antenna and coupled to the array antenna wirelessly or via a fiber, forms concurrent tracking beams for the array antenna to track the transponders. The Rx/Tx processors perform communications functions including modulation, demodulation, channelization, frequency tracking, and timing synchronization. The mini-hub communicates wirelessly with user devices onboard the moving platform.

Abstract: An apparatus comprises a wavefront muxing processor receiving first and second input signals to generate first and second output signals on first and second communication channels, respectively, the first and second output signals being at a common frequency slot and having relative differential amplitude and phase delays; and an amplitude and phase adjustment element located at one of the first and second communication channels to adjust the relative differential amplitude and phase delays using an adjustment amount to reduce interference in the first and second communication channels. The first output signal is a weighted sum of the first input signal and the second input signal that is phase shifted by a second phase shift. The second output signal is a weighted sum of the second input signal and the first input signal that is phase shifted by a first phase shift. The two output signals are transmitted to a transponder.

Abstract: A data communication system comprises an optical transferring device, optical network units, and user processors. The optical transferring device splits a received optical signal into split optical signals. Each optical network unit transforms a respective split optical signal into M first electronic signals, M>1. Each user processor comprises an input mapping unit to map the respective M first electronic signals into N second electronic signals, N?M; an equalization processor to equalize the N second electronic signals and generate a set of N equalized electronic signals; a wave-front demultiplexer to perform a wave-front demultiplexing transform on the N equalized electronic signals, and output N wave-front demultiplexed signals, each of the N wave-front demultiplexed signals being a unique linear combination of the N equalized electronic signals; and an output mapping unit to map the N wave-front demultiplexed signals into at least M third digital electronic data signals.

Abstract: A system includes a ground hub and a mobile airborne platform hovering over or close to a coverage area on or near the earth surface. The mobile airborne platform comprises a bistatic radar receiver including an antenna system to capture first radiofrequency signals originated from a first satellite and second radiofrequency signals originated from a second satellite, via direct paths and via reflected paths from the coverage area. The mobile airborne platform transmits the captured first and second radiofrequency signals to a ground hub via a feeder link. The ground hub includes a remote beam forming network to remotely form receiving beams for the antenna system of the bistatic radar receiver to capture the first and second radiofrequency signals, and a remote radar processing center to transform the captured first and second radiofrequency signals into a first and a second two-dimensional radiofrequency image, respectively.

Abstract: A method and a system for reducing undesired interference in a target zone. A set of M pickup sensors pick up undesired signals in real time and generate M pickup signals, M being an integer greater than or equal to 1. A beam forming network coupled to the M pickup sensors comprises a receiving beam forming module and a transmitting beam forming module. The receiving beam forming module receives the M pickup signals and generates K beam signals, K being an integer greater than or equal to 1. The transmitting beam forming module receives the K beam signals and generates N interference signals, N being an integer greater than 1. A set of N injectors coupled to the transmitting beam forming module receives the N interference signals, respectively, and radiates the N interference signals to the target zone.

Abstract: A communication system includes a transmitter, one or more active scattering platforms, and one or more remote receivers. The transmitter includes a beam forming network for transforming M signals into a set of shaped beams which are radiated toward the active scattering platforms by transmitter antenna elements. The active scattering platforms receive and re-radiate one or more of the radiated shaped beams toward the receivers. The beam forming network optimizes composite transfer functions under performance constraints. Each composite transfer function is a linear combination of transfer functions. Each transfer function characterizes propagation paths from one transmitter antenna element to one receiving antenna element. Each receiving antenna element is identified by a user element identification index in the transfer functions. Each receiver is identified by a user identification index.

Abstract: A power amplification system comprises a pre-processor including a wavefront multiplexer, a set of power amplifiers, and a post-processor including a wavefront demultiplexer. The wavefront multiplexer receives concurrently N input signals, N being an integer greater than 2, performs a wavefront multiplexing transform on the N input signals by attaching N wavefronts to the N input signals respectively, and generates N first output signals. The N wavefronts are unique and mutually orthogonal. The wavefront multiplexing transform has an inverse. The N power amplifiers amplify the N first output signals and generate N amplified signals. The wavefront demultiplexer performs the inverse of the wavefront multiplexing transform on the N amplified signals and generates N second output signals, the N second output signals corresponding respectively to the N input signals. Each of the N second output signals is an amplified version of a corresponding one of the N input signals.

Abstract: A system for communication comprises an antenna system that includes a reflector having a focus and a feed array positioned at or near the focus and having N feed elements, N being an integer greater than 1. The N feed elements receive N feed signals that result from illumination of the N feed elements by a target signal incident on the reflector from a slow-moving signal source. A first N-to-N Fourier Transform device performs a spatial Fourier Transform on the N feed signals to generate N wavefront signals which are orthogonal to one another. Band-pass filters filter the N wavefront signals and output N filtered wavefront signals. Frequency down-converters down-convert the N filtered wavefront signals to an intermediate frequency or baseband frequency and generate N frequency-down-converted wavefront signals. Analog-to-digital converters digitize the N frequency-down-converted wavefront signals and output N digital wavefront signals.

Abstract: A data communication system comprises a central office processor which comprises a first input mapping unit, a first wave-front multiplexer, and a first output mapping unit. The first input mapping unit receives and dynamically maps digital data into a plurality of first electronic signals. The first wave-front multiplexer is coupled to the first input mapping unit to receive the first electronic signals, perform a wave-front multiplexing transformation on the first electronic signals, and output wave-front multiplexed signals, each of the wave-front multiplexed signals being a linear combination of the first electronic signals. The first output mapping unit is coupled to the first wave-front multiplexer to receive and dynamically map the wave-front multiplexed signals into second electronic signals.

Abstract: A communications system for providing recovery communication service to users in a coverage area affected by an emergency disruption of normal communication services. The system comprises a ground hub serving as a gateway to terrestrial networks including a dispatch center and configured to communicate with at least three mobile airborne platforms roving over the coverage area via respective feeder-links in a Ku or Ka band. A first mobile airborne platform communicates in a first frequency band with emergency workers that are working in the coverage area and associated with the dispatch center. A second mobile airborne platform communicates, in place of at least one disrupted base station in the coverage area, with user mobile phones in mobile phone frequency bands or user personal devices in WiFi bands located in the coverage area. A third mobile airborne platform generates real-time imaging of surfaces located in the coverage area.

Abstract: A communications system comprises a ground hub in a background area, aerial vehicles flying in a formation with slowly varying spacing between the aerial vehicles, and a user terminal in a region within a foreground area. The foreground area is spatially separate from the background area. The ground hub comprises a ground-based beam forming facility (GBBF) for receiving and transforming input signals into beam-formed signals, and a first antenna system coupled to the GBBF for transmitting concurrently the beam-formed signals in a first frequency band to respective aerial vehicles via respective background links. The aerial vehicles receive respectively the beam-formed signals via the background links and transmit respectively the beam-formed signals as respective signal beams covering at least the region within the foreground area in a second frequency band. The user terminal comprises a second antenna system for receiving concurrently the signal beams via foreground links to the aerial vehicles.

Abstract: A retro-directive antenna system on a mobile airborne platform for communication with a ground hub located within a coverage area. The system comprises an antenna array, a receive beamforming network, and a diagnostic processor. The antenna array comprises a plurality of antenna elements. The receive beamforming network generates concurrently a plurality of receive beams for the respective antenna elements. The receive beams correspond to respective beam positions within the coverage area. A first beam position points to the ground hub and a corresponding receive beam receives a target signal from the ground hub. The diagnostic processor determines a best position for the first beam position based on a ranking system and controls the receive beamforming network by updating the beam positions based on the best position for the first beam position.

Abstract: An antenna system comprises: multiple antenna elements; and multiple beam forming networks configured to produce radiation patterns for both receiving and transmission functions configured to be optimized by re-positioning said antenna elements, wherein said beam forming networks comprise a receiving beam forming network configured to combine multiple first inputs from said antenna elements into at least a first output, and a transmission beam forming network configured to divide a second input into multiple second outputs to said antenna elements.

Abstract: A receive-only smart antenna with a directional-point command capability for communication with geostationary satellites, allowing autonomous detection of received signals in order to allow steerage of multiple beams. An array feed is used to illuminate a parabolic reflector, with each feed element of the smart antenna associated with a unique beam-pointing direction. As the receiver switches to different feed elements, the far-field beam is scanned, making it possible to track a geostationary satellite in slightly inclined orbits, eliminating the need for mechanical tracking mechanisms while maintaining high antenna gain in the direction of the satellite. The receive-only smart antenna also features capabilities for forming multiple simultaneous beams supporting operations of multiple geo-satellites closely space in slightly inclined orbits. The designs can support orthogonal beams for enhanced bandwidth capacity via multiple beams with excellent spatial isolation.

Abstract: A receiver with orthogonal beam forming technique is achieved that is capable of differentiating different signal components within the received composite signal. An adaptive processor is used to eliminate the signal component whose phase information is known or can be calculated. The phase information of the major component of a signal can be easily acquired by using a limiter. The phase information of other signal components can be acquired by their direction information and other characteristics, such as modulation scheme, etc. Multiple orthogonal beams can be formed by eliminating one unwanted signal component each time by the adaptive processor until all unwanted signal is eliminated. Thus, a composite signal from multiple sources can be broken down into their component signals.

Abstract: A novel noise injection technique is presented to improve dynamic range with low resolution and low speed analog to digital converters. This technique combines incoming signal and noise signal with wave front de-multiplexer and split into several channels. Then low resolution and low speed analog to digital converters are used to sample each channels. All signals are recovered using wave front multiplexer. For advanced design, ground diagnostic signals with optimizing processor can be added to guarantee recovery quality.