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Cloud computing can improve the computing ability of mobile terminals. However, offloading is not always energy-saving compared to local computation. In order to further improve the battery lifetime, trade-off between energy efficiency and spectral efficiency in transmitting is considered, we propose a transmission strategy to decide whether to offloading or not. This strategy focuses on the energy...
In orthogonal frequency division multiplexing (OFDM)-based cognitive radio (CR) systems, the optimized algorithms for sub-carrier power allocation face the problems of complex iterative calculation and difficult realization. In this paper, we propose an exponential power distribution function and derive a sub-optimal power allocation algorithm. This algorithm aims to allocate power of in-band subcarriers...
Ultrahigh voltage lines are playing an important role for today's power transmission. The electromagnetic pollution produced by these ultrahigh voltage lines is one of the main environmental problems. Taking the 500kv transmission and transformation in Shangcai-Henan as an example, the electromagnetic radiation of 500KV power transmission lines has been tested in this work. An algorithm of using curve-fitting...
Admission control plays an important role in OFDMA system. However, admission control becomes rather complex along with the increase of users' demand and the diversification of service types, so building an appropriate stochastic model is especially significant. The Petri net can distinctly describe the stochastic process. In this paper we build and analyze the Petri net model of admission control...
To protect the copyright of digital images efficiently, while not degrade its quality, this paper proposed a dual-domain zero-watermark algorithm, which increases the flexibility and robustness of single domain method. This algorithm embeds the zero-watermark in the highest bit planes of spatial domain and wavelet domains low frequency sub-image simultaneously, based on content's importance. Experimental...
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