Sherif I. Rabia

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Spectrum mobility in cognitive radio networks aims to enhance spectrum utilization by allowing unlicensed secondary users (SUs) to access the licensed frequency bands of the primary users (PUs). It also helps to vacate the channel from the SU when the licensed PU arrives at the channel, and finds a suitable channel for the interrupted SU. In this paper, we(More)
The technical superiority of spectral-amplitude coding optical code-division multiple-access (SAC-OCDMA) systems over traditional wavelength division multiplexing (WDM) systems in optical burst switched (OBS) networks is mainly attributed to the former's better medium access control (MAC) layer performance. Nevertheless, in order to conduct an accurate(More)
In this paper, we investigate how to determine an optimal target channel sequence with the minimum cumulative handoff delay in cognitive radio networks. When the secondary user encounters multiple spectrum handoffs during its transmission period, the effects of multiple interruptions from the high-priority primary users and the traffic statistics of both(More)