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In this paper, a slot-based MAC protocol is proposed for cognitive radio wireless networks. This protocol makes cognitive users sense licensed channels periodically, and each period consists of a fixed number of slots. When cognitive users identify un-used licensed channels, they use IEEE 802.11 distribution coordination function (DCF) to contend the spare(More)
—Enchanced Interior Gate Routing Protocol(EIGRP) is a kind of distance vector routing protocol developed by Cisco, and it is mainly based on Diffusing Update Algorithm(DUAL) which computes the best path distributedly without resulting in routing-touble loops and counting-to-infinite problem. DUAL converges as fast as OSPF but leads to less overhead. In this(More)
In this paper a simplified differential amplitude demodulation scheme is proposed for 64-DAPSK (differential amplitude and phase shift keying), which needs less quantity of decision thresholds compared with the conventional schemes. The arithmetic mean threshold (AlMT) scheme is proposed and analyzed with the simplified system in AWGN and flat Rayleigh(More)
Content-based image retrieval (CBIR) on the Web is an active research topic in recent years. However, a common problem for the content-based search is the difficulty for getting a query image, which dramatically limits the popularity of their application. The ubiquity of camera phones has opened up a new avenue for image-based mobile search and it also(More)
Although an autonomous mobile ad hoc network (MANET) is useful in many scenarios, work on the integration of MANET with Internet is more desirable. In order to realize such integration, Internet gateway is required. The main issue involved in this case is when and how a mobile node obtains information about available Internet gateways while making a minimal(More)
Prevalence of real-time service in Internet and mobile ad hoc network (MANET) is bound to stimulate the technical progress in the interconnection of MANET and Internet. The interconnection is achieved by using Internet gateways, which act as bridges between MANET and Internet. When a node in MANET wants to obtain a globally routable address for Internet(More)