Ultra Wideband and Secure Multiuser Communication System with Reduced Hardware
Abstract
Executive Summary Ultra-Wideband and Secure Multiuser Communication System with Reduced Hardware Future wireless communication and warfare systems will require much higher data rates. This challenge is exacerbated by the fragmented and congested spectrum for DoD applications. Further, the growing demand for communication and sensing implies high bandwidth, flexible, and portable communication systems that also resist to interference. With this in mind, the goal of this proposal is to implement a secure high data-rate and spectrally efficient communication transceivers (>10GHz contiguous bandwidth) with external and self-interference mitigation. Specifically, using a new class of wideband phased arrays, for the first time, a large bandwidth of 10GHz can be contiguously accessed. Coupled with the proposed realization of secure high data rate protocols, and practical low cost and low power transceivers, this effort brings forward a new class of portable transceivers for A2/AD environments. The proposed transceivers will include: 1) dual-polarized, high isolation ultra-wideband (UWB) aperture (about 50dB isolation and over 20:1 bandwidth), using collocated tightly coupled dipole elements with low angle scanning, bandwidth reconfiguration, and controllable band rejection, 2) broadband digital beamformer with reduced power requirements using a much smaller number of ADCs with power and cost reduction by a factor of 8 to 32, 3) novel hybrid frequency and code division multiplexing with channel coding for secure high data rate communications to cover an unprecedented 10GHz bandwidth with up to 40dB of additional gain and interference mitigation, and 4) secure system design, resilient to hybrid interference and eavesdropping for large scale wideband MIMO communication systems along with associated novel defense schemes against attacks on pilot transmissions and data communications. Simultaneous transmit and receive (STAR) back-end circuitry with four stages of cancellation is also proposed to achieve a greater measure of self-interference (SI) cancellation across a wide bandwidth. Specifically, >120dB reduction in SI is projected assuming a bandwidth >1 GHz. The cancellation stages will be implemented at the transmit/receive antennas (using collocated transmit/receive antenna pairs), analog radio frequency (RF) section of the receiver, analog baseband (BB), and digital cancellation sections. STAR RF suppression performance will be measured using ultrawideband digital scopes to characterize multipath transients induced by transmit beam-pattern changes and/or changes in multipath composition within the local environment. These measurements will help demonstrate the RF isolation performance achieved by the STAR system under dynamic conditions. A potential RF suppression technology augmentation will also be considered using multiple antenna architectures, feedback control, and weighted transmissions to further limit SI. It is expected that the proposed UWB secure communication system will have ubiquitous application/installation across many Navy platforms. Its portability and adaptability should also make it attractive across the DoD (marine utility vehicles and portable or airborne platforms.) Further, it can be installed on small unmanned aerial vehicles for high speed communications across many secure bands. That is, for the first time, our concept can provide for portable cognitive sensing applications and for exploiting the unused spectrum (spectrum efficiency). The proposed high data rate secure transceiver can also become essential for current and future systems to address the information glut and high speed data exchange needs.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jun 03, 2016
- Source ID
- N000141612253
Entities
People
- John L. Volakis
Organizations
- Office of Naval Research
- Ohio State University
- United States Navy