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Switched mode RF power amplifiers (PAs) under bitstream modulations, such as bandpass or envelope delta–sigma modulations (EDSMs), have received increasing attentions over the past years. Such amplifiers offer high power efficiencies under power back-off conditions with pulse train voltage waveforms yet maintain their linearity in amplification through digital coding and modulations. This paper presented...
Direct antenna modulation (DAM) has been proposed to overcome the bandwidth limitation of high Q resonating antennas by decoupling the stored energy from the coupled or radiated energy. It, however, due to its switching nature, imposes a zero voltage or zero current switching condition to the modulation technique at the symbol transition in order to achieve high radiation efficiency. Simple on-off...
The problem of secure distributed storage systems (DSS) with regenerating codes is concerned in this paper. We consider an eavesdropper model where an eavesdropper wiretaps a subset of storage nodes, and either their repairing data or stored data can be wiretapped. We focus on two typical and special cases, the Minimum Bandwidth Repair (MBR) and the Minimum Storage Repair (MSR). Our main contribution...
A Fourier domain mode locking laser with dispersion management at long-wavelength band is investigated. Sweeping bandwidth and obtained OCT axial resolution compared with the case without dispersion control is enhanced by 33% and 30%, respectively.
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