SBIR-STTR Award

Adaptive Dynamics has developed a Multiple Adaptive Generalized Interference Cancellation (MAGICTM) hardware prototype filter that has demonstrated robust performance for protecting current narrowband UHF SATCOM systems against both narrowband and frequency dynamic interference without any prior knowledge of the interference characteristics. This filter provides a radical departure from the traditional techniques for interference mitigation based on classical Weiner-based adaptive filtering approaches. Whereas the traditional gradient-based techniques often exhibit poor convergence and tracking in tactical communication applications, the MAGICTM filter directly addresses the problem of estimating, tracking and cancelling numerous signals, and provides robust communications capabilities in the presence of severe, dynamically changing interference. A detailed plan is provided to modify and implement the existing narrowband version of the MAGICTM filter and evaluate the performance of a new wideband version for mitigation of the various types of dynamic interference, both narrowband and wideband, that could degrade the performance of the MUOS 5 MHz UHF SATCOM system. Leveraging a WCDMA testbed developed under prior work, preliminary results for applying the modified broadband MAGICTM filter to the 5 MHz WCDMA waveform indicate excellent performance for mitigating extremely strong narrowband and 5 MHz chirped interference.

Keywords:
Ufo, Ufo, Interference Mitigation, Wideband Interference, Jamming, Dynamic Interference, Muos, Uhf Satcom, Interference Cancellation,

Todays military operations depend on reliable voice and data communications all the way to the tactical edge, including between individual dismounted infantrymen. Competing wireless services, self-protection electronic countermeasures (CREW), and hostile jamming can saturate the spectrum and impair essential communications. Adaptive Dynamics, Inc. has developed the novel Multiple Adaptive Generalized Interference Cancellation (MAGICTM) filter, which has demonstrated remarkable performance for protecting narrowband UHF communications by separating out multiple overpowering interfering signals while preserving the desired communications signal. This technique has been further developed and demonstrated with high fidelity simulations to be effective when applied to wideband waveforms, potentially mitigating interference levels in excess of 80dB above the desired signal. In the proposed work, Adaptive Dynamics will develop enhancements to the MAGICTM filter applicable to the Soldier Radio Waveform (SRW), optimize the algorithm as a VHDL core for insertion into the baseband processing chain of an ITT Exelis Soldier Radio-Rifleman (SR-R), and perform field testing in a tactical electro-magnetic interference (EMI) environment.

Benefit:
This built-in interference mitigation (IM) capability would provide a significant advantage to US forces equipped with new JTRS software defined radios (SDR). Successful application of the MAGICTM filter would enable SRW radios to maintain effective communications in RF hostile EMI environments, including in the presence of CREW or enemy jamming systems. Because it is a software modification to the SDR configuration, this advantage could be introduced to a wide range of the next generation of radios at minimal cost, and subsequent development could extend the IM capabilities to other JTRS waveforms through software upgrades. With DoD planning to purchase hundreds of thousands of SDRs to replace current stocks, this technology could potentially find itself integrated into most next generation devices.

Keywords:
CREW jamming, Referenceless, Soldier Radio Waveform (SRW), Interference ancellation, JTRS, signal separation, adaptive filtering., rifleman radio, wideband, Interference Mitigation