A Survey on Modulation Schemes Used for Link Adaptation in WiMAX Networks

Interoperability for Microwave Access (WiMAX) is a telecommunications technology that uses radio spectrum to transmit bandwidth between digital devices. WiMAX has the ability to transmit large amount of data to large distance. The IEEE standard for WiMAX defines an adaptive modulation framework which allows a WiMAX system to communicate with various burst profiles according to the link quality. This adaptive modulation framework is also called as link adaptation. This link adaptation scheme uses different modulation schemes for different communication link quality. This paper analysis different modulations schemes used in WiMAX link adaptation. Keywordslink adaptation, QPSK, 16QAM, 64QAM, BPSK