Abstract In this paper, we consider problem of positioning of mobile phones, different approaches were produced for these targets using GPS, WiFi, GSM, UMTS and other sensors, which exist in today smart phone sensors. Location awareness in general is emerging a tremendous interest in different fields and scopes. Position is the key element of context awareness. However GPS produces an accurate... In this paper, we consider problem of positioning of mobile phones, different approaches were produced for these targets using GPS, WiFi, GSM, UMTS and other sensors, which exist in today smart phone sensors. Location awareness in general is emerging a tremendous interest in different fields and scopes. Position is the key element of context awareness. However GPS produces an accurate position, it requires open sky and does not work indoors. We produce an innovative robust technique for positioning which could be applied on terminal-based or network-based architecture. It depends only on Received Signal Strength (RSS) and location of Base Transceiver Station (BTS). This work has been completely tested and analyzed in Egypt roads using realistic data and commercial android smart phone. In general, all performance evaluation results were good. Mean positioning error was about 120 m in urban and 394 m in rural. Read More Read Less

Abstract Mobile communication devices have become popular tools for communicating among people. This paper is a launcher for sending/receiving secured SMS/Multimedia files using Blowfish algorithm. A smart mobile application on android platform is introduced as an application that helps the user to encrypt the message (SMS/Multimedia files) before it is transmitted over the mobile network. The new idea of the program... Mobile communication devices have become popular tools for communicating among people. This paper is a launcher for sending/receiving secured SMS/Multimedia files using Blowfish algorithm. A smart mobile application on android platform is introduced as an application that helps the user to encrypt the message (SMS/Multimedia files) before it is transmitted over the mobile network. The new idea of the program is to transmit encrypted messages and multimedia files or any other type of files via mobile networks or the internet as an alternative mean. Utilizing the internet takes place through a secured hosting website with a user name and password integrated in the program. To maintain intensive security, a private key encrypts the files and another private key encrypts file name. The transferring media is maintained online in the absence of mobile network coverage. Read More Read Less

Abstract In this paper, a usage of splitting source - node power is proposed for a two-phase cooperative relaying system where the transmit powers of the source and the relay node are individually constrained. In the proposed usage, the limited source power is divided into two parts that are used in the first and the second phase, respectively. Unlike conventional relaying... In this paper, a usage of splitting source - node power is proposed for a two-phase cooperative relaying system where the transmit powers of the source and the relay node are individually constrained. In the proposed usage, the limited source power is divided into two parts that are used in the first and the second phase, respectively. Unlike conventional relaying methods, the source again in the second phase transmits its signal with the split power and, at the same time, the relay forwards the signal received at the first phase, which causes intervention between the signals. In order to avoid the intervention, so-called a co-phasing weight for aligning the phases of the two signals is used at at the source before the second transmission. The forwarding operation at the relay however is exactly the same to the conventional ones. Optimal power-splitting as well as the co-phasing weight is provided in this paper. With numerical investigation, the proposed powersplitting is shown to significantly reduce the outage probability compared with the conventional individual power allocation. Read More Read Less

Abstract Automatic identification of the digital modulation type of a signal has found applications in many areas, including software defined radio (SDR), surveillance and threat analysis. This paper describes the FPGA based implementation of Automatic Modulation Recognition (AMR) algorithm for advanced communication payload. A wavelet transform based algorithm which involves multi-rate signal processing, is realized to distinguish QAM, PSK and FSK... Automatic identification of the digital modulation type of a signal has found applications in many areas, including software defined radio (SDR), surveillance and threat analysis. This paper describes the FPGA based implementation of Automatic Modulation Recognition (AMR) algorithm for advanced communication payload. A wavelet transform based algorithm which involves multi-rate signal processing, is realized to distinguish QAM, PSK and FSK digital modulation signal in noisy environment. The approach is to use wavelet transform to extract the transient characteristics in a digital modulation signal to identify the type of modulation. The optimum thresholds are derived from rigorous simulation in MATLAB/Simulink under the condition that the input noise is Additive White Gaussian (AWGN). The performance of the identification scheme is investigated through simulations. The design is implemented and tested in Xilinx Virtex-4 FPGA based card. Read More Read Less