Mohammed S. Elmusrati

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In this paper, we apply the power control concept to optical CDMA star networks. Two approaches are considered, namely, centralized and distributed power control. Both approaches are used to optimize the optical transmit power and to maximize network capacity in terms of the number of users satisfying a target signal to interference (SIR) ratio. Centralized(More)
Optical code division multiple access (CDMA)-based networks are an interesting alternative to support various traffic types of multimedia applications with highly variable performance targets. Generally, multilength codes are designed to support multirate services, while the multiweight codes are designed to support differentiated quality of service (QoS)(More)
This paper investigates optical power control to enhance capacity of optical CDMA star coupled networks. We consider a network in which the nodes encode their optical signal by prime codes, and the resulting error rate performance is inspected with and without power control. Network impairments, such as fiber attenuation, star coupler loss, thermal noise(More)
In this paper we study the capacity of spectrum sharing cognitive radios (CR) with Maximal Ratio Combining (MRC) diversity at the secondary receiver under asymmetric fading, where the channel from secondary transmitter to primary receiver suffer Nakagami-m fading while the one from secondary transmitter to its receiver follows Rayleigh Multipath fading. We(More)
In modern greenhouses, several measurement points are required to trace down the local climate parameters in different parts of the big greenhouse to make the greenhouse automation system work properly. Cabling would make the measurement system expensive and vulnerable. Moreover, the cabled measurement points are difficult to relocate once they are(More)
In this paper we study the capacity of spectrum sharing cognitive radios (CR) with Maximal Ratio Combining (MRC) diversity at the secondary receiver under Rayleigh fading. However, the secondary user does not have perfect channel information of SUtx − PUrx link, where the estimation error is considered. Our mathematical analysis and numerical results show(More)
In this paper we investigate the effect of photodetector nonlinearity on the optimum transmit power setting in an asynchronous optical CDMA network. Network impairments as well as thermal noise, shot noise and multiple access interference (MAI) are taken into account. Unlike in traditional systems, the optical detector generated shot noise adds a new(More)
In this paper, we study the maximum stable throughput region of the proposed systems using stochastic dominance technique for optimizing utilization of a cognitive shared channel. A cognitive protocol on the general multipacket reception channel model is adopted [1], [2], where the primary transmission may succeed even in the presence of secondary(More)