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Different radio channels have various characteristics, which is analogous to human “fingerprint”, and the difference between the characteristics is defined as radio channel fingerprint. In this paper, we construct a quantitative radio channel fingerprint model based on the entropy weight method. With this model, five indicators, including time delay spread, coherence bandwidth, Doppler spread, fading...
NAT-PT is one of the most important technologies that can realize the communication between IPv4 network and IPv6 network. From the requirements of NAT-PT, we implement a Ultralin NAT-PT platform based on embedded Linux system. The bandwidth and latency of Ultralin NAT-PT system between IPv4 and IPv6 are tested, and the performance of the gateway is analyzed in this paper. As a result, Ultralin system...
High-speed normal-incidence p-i-n InGaAs photodetectors epitaxially grown on silicon substrates by metal–organic chemical vapor deposition has been demonstrated. The InGaAs active layer lattice-matched to InP was successfully grown on Si substrates employing metamorphic growth of InP and GaAs buffers with a two-step growth technique, in addition to cyclic thermal annealing and strain-balancing layer...
A dual rhombic loop antenna with double parasitic loops to increase the bandwidth of circular polarization operation is proposed. The gap position of each loop controls the sense of circular polarization. The original dual rhombic loop radiates a CP wave at a lower frequency while the parasitic loop produces CP radiation at a higher frequency. A combination of the two frequencies leads to a bandwidth...
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