DESIGN AND PERFORMANCE ANALYSIS OF VCO FOR STANDARD GSM USING MEMS

The design of a prototype monolithic Micro Electro-Mechanical Systems (MEMS) electronic circuits, namely the Voltage Controlled Oscillators (VCOs) is presented. The components can achieve the stringent requirements of wireless communication applications such as GSM cellular telephony. The VCO meets the low phase noise specifications of -136 dBc/Hz at large offset frequency of 3MHz, over the appropriate frequency range. The model of the monolithic VCO is based on the topology of the Colpitts Oscillator. It is relatively less complicated, which facilitates the practical integration of the MEMS components into the configuration. The variable capacitor and the monolithic 3-D coil inductor are suitable for low phase-noise and low power consumption at the application frequencies. A PSpice simulation model was developed with MEMS switching devices that can be integrated into the system. The model helps in determining the design parameters, which affect the performance and operation reliability of the RF transceiver system, for which a prototype has been tested and proved successful

Novel Framework for Hidden Data in the Image Page within Executable File Using Computation between Advanced Encryption Standard and Distortion Techniques

The hurried development of multimedia and internet allows for wide distribution of digital media data. It becomes much easier to edit, modify and duplicate digital information. In additional, digital document is also easy to copy and distribute, therefore it may face many threats. It became necessary to find an appropriate protection due to the significance, accuracy and sensitivity of the information. Furthermore, there is no formal method to be followed to discover a hidden data. In this paper, a new information hiding framework is presented.The proposed framework aim is implementation of framework computation between advance encryption standard (AES) and distortion technique (DT) which embeds information in image page within executable file (EXE file) to find a secure solution to cover file without change the size of cover file. The framework includes two main functions; first is the hiding of the information in the image page of EXE file, through the execution of four process (specify the cover file, specify the information file, encryption of the information, and hiding the information) and the second function is the extraction of the hiding information through three process (specify the stego file, extract the information, and decryption of the information).Comment: 6 Pages IEEE Format, International Journal of Computer Science and Information Security, IJCSIS 2009, ISSN 1947 5500, Impact Factor 0.42

Simulation evaluation of DiffServ approach integrated in MIPv6 networks

Nowadays the Best-Effort (BE) service that is provided by the Internet is not good enough. Namely, it is adequate only for traditional Internet applications such as e-mail, web browsing and file transfer. However, recently we have seen a hug revolution in real-time applications like IP-telephony, multimedia conferencing, e-commerce, audio and video streaming. These types of applications require resource assurance and service differentiation to offer QoS guarantees (i.e. high bandwidth, low delay and/or delay variation). Working on providing QoS in the Internet has led to three distinct approaches endorsed by Internet Engineering Task Force (IETF) namely, IntServ, DiffServ and MPLS. Above all, the most promising one due to its simplicity and scalability advantages is Differentiated Service (DiffServ). The DiffServ approach was initially designed without mobility in-mind. It is still not fully adapted to mobile environments yet. Obviously, integrating QoS with mobility support seems to be needed to fulfill the necessity of users. Therefore, one of main requirements of next generation IP based networks is providing QoS for real-time traffic that will be transporting through MIPv6 networks. This paper aims to propose a new scheme that takes the advantage of DiffServ to enhance QoS in the mobile IPv6 network. The proposed scheme was evaluated by using NS-2. The proposed scheme is benchmarked with the standard MIPv6 which was proposed by IETF. The obtained results show that the proposed scheme outperforms the standard MIPv6 protocol in terms of packets loss and handover latency