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The drawbacks of high peak to average power ratio (PAPR) can outweigh all the potential benefits of Orthogonal Frequency Division Multiplexing (OFDM) signals. In this Paper, a sophisticated PAPR reduction technique, named Iterative Clipping and filtering (ICF) with DCT/IDCT transformation, is proposed for OFDM system. By considering the example of OFDM,(More)
A Wireless Local Area Network (WLAN) is a type of Local Area Network (LAN) that uses high frequency radio waves rather than wires to communicate and transmit data [1]. It is a flexible data communication system implemented as an extension to or as an alternative for, a wired LAN. It provides large companies the option to connect the current wired networks(More)
Orthogonal Frequency Division Multiplexing (OFDM) is an efficient method of data transmission for high speed communication systems. However, the main drawback of OFDM systems is that, it exhibits high Peak to Average Power Ratio (PAPR) of the transmitted signals which causes inefficient use of the High Power Amplifier (HPA) and could limit transmission(More)
The current UWB communication systems, such as 2PPM-TH, DS-UWB and OFDM have some drawbacks and do not provide the variable rates service. Thus, the hybrid OVSF-TH-UWB is proposed to address the above problems, and a corresponding correlation mask is designed. Both performance analysis and simulation results prove that our OVSF- TH-UWB system can(More)
A new intrusion alarm system is presented in this paper which is skillfully combined with fuzzy reasoning and neural network technology. In order to overcome the difficulty of specifying the membership function of rules depending on experiences of experts in multi-dimensional space, fuzzy reasoning machine network model is introduced to carry through proper(More)
In order to solve the existing security problem of the distributed network cloud disk, such as transmission, storage security problems, etc, a network cloud disk safety storage scheme based on Hadoop is proposed. Based on the different confidential level of user data, it gives selective encryption scheme, which gives full consideration to the following(More)
Secure communication is very important in computer networks and authentication is one of the most eminent preconditions. This paper proposes Session-key derivation, decentralize key management for wireless sensor networks covering the aspects of key deployment, key refreshment, and key establishment to achieve a high-level security for WSNs.
—The existence DNA computing models can solve most hard NP problems in theory. The graph isomorphism problem is a classical NP-hard problem. In this paper we proposed a DNA-based sticker algorithm, which uses the concept of incidence degree sequence to solve the graph isomorphism problem. The proposed algorithm is simplicity of operation and only O(2 n) DNA(More)
It is with no doubt that recent trends indicate that cellular networks based on the 3G standards and wireless Local Area Networks (WLANs) coexist to offer multimedia services to end users. However, while users roam throughout this heterogeneous network, they should be automatically and transparently switched from one access technology to another such as(More)
We proposed a distributed energy saving clustering algorithm BPEC. Cluster-heads are elected by two probabilities. The primary probability is based on the ratio between average residual energy of neighbor nodes and itself residual energy. The subsidiary probability is the node's degree. By using BPEC algorithm, the entire network broadcasting complexity is(More)