Abstract:

The spectrum resource of WiMAX system is very scarce. How to improve the spectrum utilization and reduce interference with other systems to achieve co-existence needs to be resolved. The performance and spectrum utilization improvement of WiMAX system is studied by using periodogram detection and spectrum pool technology. WiMAX systems 802.16e baseband link is used, and channel model is M.1225 VA channel. In the spectrum sensing module, spectrum model is the sum of 256 Rayleigh fading signal sine whose frequency bins are independent of each other. The space between frequency bins is 8 sub-carrier spaces. Before the transmission of each data frame, secondary user use periodogram detection technology to detect spectrum hole, then transmit data on the spectrum hole by spectrum pool technology. The simulation results show that using cognitive radio technology reduces the interference to secondary user and avoid influencing on prime user. The spectrum utilization and performance of WiMAX system is also greatly improved.

Key words: WiMAX performance, cognitive radio, periodogram detection, orthogonal frequency division multiplexing (OFDM), spectrum pool