Performance of Enhanced Dynamic Frequency Hopping in IEEE 802.22 with MIMO Implementation

This paper presents an enhanced scheme for the dynamic-frequency-hopping (DFH) technique introduced in the IEEE 802.22 standard for wireless regional area networks (WRAN). The performance of the DFH in the IEEE 802.22 standard is analysed in the presence of a Rayleigh fading channel implementing a multiple-input multiple- output (MIMO) system. We show the effect of interference caused by the Primary User (PU) appearance during the Secondary User (SU) data transmission. The system bit error rate is evaluated in order to demonstrate this effect. To overcome the limitations of the DFH on the system performance, we propose a modified spectrum sensing technique where spectrum monitoring is integrated with DFH to leverage higher throughput gains for the secondary network. The enhanced method is analyzed and simulated for a MIMO system.