We present a new approach for signal separation from an undetermined instantaneous mixture of two BPSK (Binary Phase Shift Keying) signals in AWGN (Additive White Gaussian Noise) channel. The method uses frequency diversity of the mixture (frequency shift between carriers) and the fact that signals of interest are binary variables. We compare separation results of our method to a theoretical BE...

Abstract—In this paper, we propose to recover collided packets between Primary Users (PUs) and Secondary Users (SUs) in Cognitive Radio Networks (CRNs) for two scenarios. The PU’s (or SU’s) receiver considers the SU’s (or PU’s) transmitted packet’s signals as an interference, and hence, cancels its effect in order to recover its corresponding received packet’s signals. Recovering collided packe...

This paper examines the outage probabilities of BPSK and BPSK/DFE radio modems with omnidirectional and six-sector antennas. The effects of room size, data rate, transmitted power and sector antenna patterns on the performance of the systems are analyzed. A 2-D ray tracing algorithm is used to model the radio propagation in a typical indoor environment used for wireless LAN applications. The pa...

In this paper a novel data multiplexing scheme is presented. This technique uses an antenna array with K transmit antennas. In total K information bits are multiplexed in an orthogonal fashion. The special property of the multiplexing technique is that for each symbol duration only one out of K antennas is transmitting using BPSK modulation. Furthermore, the symbol duration is equivalent to the...

In this paper we analyze the performance of 802.15.4 Wireless Sensor Network (WSN) and derive the queue size trade off for different modulation schemes like: Minimum Shift Keying (MSK), Quadrature Amplitude Modulation of 64 bits (QAM_64) and Binary Phase Shift Keying (BPSK) at the radio transmitter of different types of devices in IEEE 802.15.4 for WSN. It is concluded that if queue size at the...

In this paper, we made a comprehensive study to evaluate the performance of a multi-user MIMO MCCDMA wireless communication system. The channel encoded spatially multiplexed MIMO MCCDMA system under investigation incorporates four linear signal detection schemes (Equalizers) such as Minimum Mean Square Error (MMSE), Zero Forcing (ZF), Sphere Decoding and Q-less QR Decomposition under BPSK, DPSK...

The aim of this paper is to show a new algorithm for key exchange and reliable data transmission through the mobile grid computing environment. The system uses very strong one way functions based on the combination of a family of algebraic curves and a Low-Density Parity-Check code (LDPC). The security of the whole scheme is guaranteed by the intractability of the discrete logarithm problem on ...

In this paper, three new ultra wideband (UWB) communication systems with quadrature-phase shift keying (QPSK) impulse modulation are proposed. First, direct-sequence (DS) multiple-access scheme is applied. The second proposed system is based on time-hopping (TH) multiple-access scheme. The last proposed system applies TH multipleaccess scheme with QPSK impulse modulation and pulse position modu...