  This work proposes model design in securing the IEEE 802.16 WiMAX Physical
and MAC layer, using Orthogonal Frequency Division Multiplexing (OFDM) and STBC
model. Typically, it addresses the physical and MAC layer security concerns,
using a Space Time Block Coding (STBC), link encryption, and Message
Authentication Code (MAC) technique. The model conforms to Multiple Input
Single Output (MISO) fading channels which model two or more transmitters and a
receiver in multiuser environment. The two fading link parameters are assumed
to be same. Channel estimate for each link, in combination to the received
signal is based on Reed Solomon Convolution Coding (RS-CC) algorithm, which
occurs as a result of the Space-Time Diversity Combiner block. In addition the
model explore using communication blocks to measure and display bit error rate
after encryption algorithm and Message Authentication Code (MAC) have been
adapted in Forward Error Correction (FEC) mode. Channel SNR and estimation in
rate ID is applied. The final results shows authentication, and the
Reed-Solomon decoding of the final information or data received.
