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Directly modulated semiconductor lasers for underwater wireless optical communication (UWOC) have limitations in output power and beam quality. Diode-pumped solid-state lasers (DPSSLs) have the merits of long lifetime, high stability, large power and good beam quality, which are promising to realize long-each UWOC. We compose a DPSSL with discrete components and measure its key parameters. The bandwidth...
A novel dual-polarized dielectric resonator antenna (DRA) for 3.5 GHz LTE base station is presented in this paper. In the design, a hybrid feeding technique is used to obtain high-isolation and low cross-polarization. The bandwidths of both ports are increased by digging a symmetric hole in the dielectric resonator (DR). In addition, the symmetric radiation patterns could be obtained because of the...
Distributed reflective denial of service (DRDoS) attacks, especially those based on UDP reflection and amplification, can generate hundreds of gigabits per second of attack traffic, and have become a significant threat to Internet security. In this paper we show that an attacker can further make the DRDoS attack more dangerous. In particular, we describe a new DRDoS attack called store-and-flood DRDoS,...
We propose a novel Kerr-effect compensator in digital coherent receivers, in which optimized single split-steps are aligned in parallel in the frequency domain. Computer simulations show that our scheme can drastically elongate the transmission distance.
The time-varying feature of wireless channels usually makes the hard delay bound for data transmissions unrealistic to guarantee. In contrast, the statistically-bounded delay with a small violation probability has been widely used for delay quality-of-service (QoS) characterization and evaluation. While existing research on the statistical-delay control mainly focused on the single-hop links, in this...
With the explosion increasing data in Internet, high performance scalable router has become a hot spot research area both in academe and industry recently. The underlying topology is a very important fold for scalable router. In this paper, we propose a new underlying topology of the scalable router, and name it Compressed 3D-Torus (C3D-Torus). It's more like the 3D-Torus, which is a famous architecture...
At present, the 3rd Generation Partnership Project (3GPP) has agreed on using the high interference indicator (HII) for uplink inter-cell interference coordination (ICIC). HII indicates the potential uplink interference to other cells. In traditional HII based ICIC schemes, cells suffering from different inter-cell interference receive the same HII, it therefore causes ICIC to have a low efficiency...
Thickness extension mode excited by electric field across the thickness of piezoelectric substrate has long been used for various applications. In the present study, the properties of thickness extension mode excited by lateral electric field on LiTaO3 have been investigated using the extended Christoffel-Bechmann method. It is found that the Lateral field excitation (LFE) coupling factors for a-mode...
In the practical application, the Air-Ground (A/G) aeronautical communications are deployed in three dimensions (3D), which makes the different capacity evaluation from the terrestrial communications, e. g. 3G and 4G. Especially, different access schemes will result in different system capacities. In this paper, the system capacities for A/G communications with the access scheme of FDMA, TDMA, CDMA...
Non-contiguous orthogonal frequency division multiplexing (NC-OFDM) system is used in the wide-band communications, especially for the wide-band cognitive radio, e. g., IEEE 802.22. However, in the high speed mobile environment, NC-OFDM suffers from inter-carrier interference (ICI). Due to the non-uniformed Doppler spread in the wide-band, it is not efficient to use the traditional ICI cancelation...
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