A Study on the Performance of OFDM Transmission Scheme for QAM Data Symbol

Due to the interference signal and fading in the environment of wireless communication channel for the multi-user, the robust multiple access scheme such as OFDM (orthogonal frequency division multiplexing) is needed for the wireless communication system. OFDM has already been applied in the wireless LAN and it is also used with the MIMO technique to improve the transmission performance in the multi-fading channel. In order to understand more about OFDM technique which is considered to play the main role for the coming of the next generation of wireless network known as 4G, in this paper we study about the process of sending the data information with QAM-OFDM. Through out the result of the simulation we can see that QAM symbol constellation is full recovered.