An Analysis of Active Interference Cancellation for Wideband OFDM System from Multi-band OFDM System

Abstract—Recently, the shortage of assignable radio frequency spectrum became a serious issue because of the coexistence of many licensed wireless communications systems. Therefore, cognitive radio technology has gained much attention around the world, which may be aware of its environment and makes occupancy of radio spectrum more efficient. This paper examines numerical results of active interference cancellation (AIC) between wideband OFDM (WB-OFDM) system and multi-band OFDM (MB-OFDM). Since MB-OFDM systems share frequency spectrum with many WB-OFDM systems, and need to coexist with other ultra wideband (UWB) communications systems. The performance of avoidance the interference for WB-OFDM system in MB-OFDM system transmitter. Moreover, computer simulations have been performed to confirm these analytical results.