Abstract:
WiMAX stands for "Worldwide Interoperability for Microwave Access". The name WiMAX was created by the WiMAX Forum to describe IEEE 802.16 based technology.
In this thesis, the focus was on the physical layer of WiMAX. A model was designed that was compatible with the IEEE 802.16-2004 standard which is based on Orthogonal Frequency Division Multiplexing (OFDM). The model consists of the transmitter, the channel, and the receiver. All stages were taken into account of the transmitter and receiver and also did not forget the wireless channel characteristics such as fading and path loss.
The Channel model used is SUI, because it is commensurate with the characteristics of the WiMAX channel.
The physical layer of WiMAX was simulated using MATLAB. The performance analysis of WiMAX physical layer is based on the bit error rate (BER) as result of simulation. The results plotted of for different modulation and coding schemes.
As a result of WiMAX physical layer simulation, founded that low-level modulation and coding schemes offer low bit error rates and High-level modulation and coding schemes increase the bit error rates. One of WiMAX features is Adaptive Modulation and Coding technique; when the radio link is good, a high-level modulation is used (64 QAM); when the radio link is bad, a low-level, but also robust, modulation is used like (QPSK).The comparison between these effects with Reed-Solomon (RS) encoder with convolutional encoder using different rated codes in FEC channel coding will be investigated.
Also founded that the use of the reed Solomon coding and interleaving techniques decreases the BER.
