BER IMPROVEMENT IN WIMAX SYSTEMS: A IMPLEMENTATION

This paper focuses on mitigating one of the most serious challenges of WiMAX systems which BER degradation. The reason for BER degradation can be attributed to the random nature of wireless channels, mobility of users causing Doppler Shifts and changing scenario of Interacting Objects (IOs). Since WiMAX uses multicarrier modulation like OFDM, hence it becomes impractical to expect a frequency flat nature of the wireless channel along the entire band of the frequency. The proposed technique presented in this paper utilizes the channel state information (CSI) of the channel to decide a threshold for multiple sub-carriers and suppress the ones whose strength is below the particular threshold. It has been shown that the proposed technique attains better results compared to conventional WiMAX systems