Abstract
Cognitive radio (CR) is proposed to automatically detect and exploit unused spectrum while avoiding harmful interference to the incumbent system. In this paper, we emphasize the channel capacity comparison of a CR network using two types of multicarrier communications: conventional Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) and Filter Bank based MultiCarrier (FBMC) modulations. We use a resource allocation algorithm in which subcarrier assignment and power allocation are carried out sequentially. By taking the impact of Inter-Cell Interference (ICI) resulting from timing offset into account, the maximization of total information rates is formulated under an uplink scenario with pathloss and Rayleigh fading, subject to maximum power constraint as well as mutual interference constraint between primary user (PU) and secondary user (SU). Final simulation results show that FBMC can achieve higher channel capacity than OFDM because of the low spectral leakage of its prototype filter.
Highlights
Cognitive Radio (CR) is a fully reconfigurable wireless system that automatically changes its communication variables in response to network and user demands
The objective of this paper is to compare the spectral efficiency performance of Orthogonal Frequency Division Multiplexing (OFDM) and Filter Bank based MultiCarrier (FBMC) based on a realistic uplink CR network
Instead of using the interference due to the outof-band radiation of the power spectral density, intercell interferences resulting from timing offset in OFDM and FBMC based networks are considered in our proposed algorithm
Summary
Cognitive Radio (CR) is a fully reconfigurable wireless system that automatically changes its communication variables in response to network and user demands. We compare the spectral efficiency performance between OFDM and FBMC based CR networks, at the assumption of that spectrum sensing has been well implemented. We focus on the comparison of OFDM and FBMC based CR networks in terms of the averaged spectral efficiency of the secondary system, which depends on its resource allocation strategy adopted by the secondary system. For OFDM and FBMC based non-CR systems, their capacity performances will be the same under the same system model and the same resource allocation algorithm. Whichever resource allocation algorithm is adopted in CR systems will not change the final comparison conclusion: FBMC is more efficient in spectral use than OFDM, which mainly depends on the intercell-interference level.
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