Modulation switching in OFDM for WiMAX through Rayleigh fading channel using GNU Radio

Abstract

This paper presents modulation switching in OFDM for WiMAX specifications by considering Raleigh fading channel using GNU Radio companion. WiMAX technology is considered as the most eminent solution able to allow a Broadband wireless Access (BWA) in metropolitan areas with a merer installation and lower cost. OFDM is the fundamental block in WiMAX PHY layer. Modulation switching is performed in WiMAX to amend the network performance in the case of Non-LoS communication. This work proposes a script in Python to build a block which selects the modulation scheme to be used in OFDM. The results show that a selector block automatically adopts the modulation scheme to be used, while an OFDM system is in operation.