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A broadband dual-polarization antenna element is presented in this paper. It contains four square-loop radiator dipoles and the quarter-wavelength balun. The antenna achieve a common impedance bandwidth of 1.54GHz-2.5GHz(S11<-10dB) at the input port, it has good performance in the isolation, which is more than 28.7dB, the gain of the antenna is above 8.2dB. In the entire operating frequency, the...
As one of the most popular anonymous communication systems, Tor has become a research hotspot in this area. Recently, Tor nodes from Tor families (referred to as family nodes) have played an increasingly important role and caused significant influence on the Tor network. However, existing research about Tor mostly focuses on the entire Tor network without much consideration about the difference between...
The capacity of differential pulse-position modulation (DPPM) is considered in this paper. Since the formula of Shannon Capacity is effective only in the AWGN channel with continuous-valued inputs and outputs, while the channel employing M-ary DPPM modulation has discrete-valued inputs and continuous-valued outputs, we derive the modified formula which applies to calculate the capacity of a UWB system...
To reduce the excessive amount of computation of traditional motion estimation (ME) algorithm, the diagonal match criterion (DMC) was proposed. DMC brings 75% reduction of computation Complexity and just 2.08% reduction of performance (PSNR) compare with traditional ME algorithm. What’s more important is that beside low, the performance reduction is very stable. And this makes DMC a valuable criterion...
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