Traffic volume rises as a result of the rapid expansion of mobile broadband usage. Investigate 4G technology options in order to better meet these future requirements using different technology standards. LTE and WiMAX are two newly created broadband wireless technologies that are being investigated. LTE and WiMAX, two of the most advanced next-generation mobile broadband technologies, serve as the technological cornerstones of 4G wireless broadband networks. For nextgeneration, or 4G, broadband wireless networks to better serve present and future demands and mobile internet applications, QoS structure is a crucial component. These technologies are made to support QoS both now and in the future. IEEE 802.16E, IEEE 802.16M (WiMAX), and LTE are 4G mobile broadband technologies that support a variety of applications with different QoS requirements. We have corroborated in this manuscript that in a flat Rayleigh fading channel, the hybrid LDPCSTBC coding scheme performs better than individual STBC for the similar SNR values for OFDM based WiMAX system.