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High power fibre laser sources in the 2 μm wavelength region with picosecond-scale pulse durations have attractive applications such as materials processing, eye-safe radar and nonlinear frequency conversion to mid-infrared wavelengths. Current implementations are typically based on the amplification of picosecond pulses obtained from a mode-locked oscillator, and pulse energies of several hundred...
This paper presents a genetically evolved antijamming beamforming array. The performance of a genetic algorithm (GA) is evaluated in situ as part of a hardware-in-the-loop optimization system. The GA was able to find reasonable beamformer settings to thwart a maximum of three stationary jammers while allowing reception of a signal of interest. Although the array operates in the 2.4 GHz 802.11g band,...
A multiplierless structure using an 8th order band pass (BP) sigma delta (Σ△) modulator for synthesizing the intermediate frequency (IF) signal is presented in this paper. A fractional delay interpolation filter combining cascaded integrator-comb (CIC) and Lagrange filters is used before the Σ△-modulators to suppress the image caused by the time-interleaving in the IQ-paths. Closed form formulas for...
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