Performance of concatenated FEC under fading channel in wireless-MAN OFDM system

The forward error correction (FEC) code in IEEE 802.16a OFDM mode deals with six mandatory options for different data rates. Different from WLAN systems, IEEE 802.16a OFDM system incorporates Reed-Solomon (RS) encoder of (255,239,8) with convolutional encoder as a concatenated code. This paper presents the performances of the six mandatory options with concatenated code under fading channel. The RS encoder only and convolutional encoder only for FEC in the wireless-MAN OFDM system is also simulated to figure out the performance given by the concatenated code. As a more practical work, the packet detection, frequency offset estimation, frame synchronization, cyclic prefix estimation, and channel estimation of inner loop procedures, which deal with channel effects are already put into this design.