Abstract
The multi-hop cognitive radio network (CRN) has attracted much attention in industry and academia because of its seamless wireless coverage by forming multi-hop links and high spectrum utilization of cognitive radio (CR) technology. Using multi-slot statistical spectrum status information (SSI), this work investigates the average spectrum efficiency (SE) of a multi-radio multi-hop (MRMH) CRN where each hop is permitted to use different spectra and long-distance hops can reuse the same idle primary user (PU) spectrum. Faced with the modeled SE problem, which is a complex non-convex fractional mixed integer nonlinear programming (MINLP) problem, the optimal spectrum and power allocation for multi-hop links in multi-slot and multi-channel scenarios can be obtained with the proposed successive multi-step convex approximation scheme (SMCA). As shown through computational complexity and simulation analysis, SMCA can obtain an approximate lower bound of the optimal solution for the modeled SE problem with a lower computational cost. Furthermore, some potential relationships between network performance and spectrum idle rate can be easily discussed with SMCA, which can provide some sensible deployment strategies for the MRMH CRN in future multi-slot scenarios.
Highlights
The wireless spectrum is the cornerstone of wireless communication
The goals of this section are to verify the effectiveness of our proposed scheme and to study the network performance, including the average spectrum efficiency (SE), in different scenarios
The performance results in terms of average spectrum efficiency, multi-hop transmission rate, spectrum occupation, and execution time of the involved algorithms as the spectrum idle rate changes are vividly demonstrated by Figure 4
Summary
The wireless spectrum is the cornerstone of wireless communication. In recent years, the spectrum has become scattered or unavailable, and especially the licensed spectrum. Cognitive radio (CR) technology allows the secondary user (SU) to transmit using the idle time of the spectrum licensed to the primary user (PU). In this way, CR can efficiently improve spectrum utilization. Based on the above assumption, this work concentrates on designing a reasonable and efficient spectrum allocation and power control scheme to improve the spectrum utilization (i.e., spectral efficiency: SE) of multi-hop. With reference to the statistical spectrum status information (SSI), an average SE programming problem of a multi-hop cognitive link is modeled to address the spectrum and power allocation simultaneously. The network performance is analyzed along with the change of the spectrum idle rate, which can give us some potential deployment references for multi-hop CRN under multi-slot scenarios in the near future
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