PERFORMANCE STUDY OF THE MCCDMA AS PHYSICAL LAYER FOR MOBILE WIMAX TECHNOLOGY

摘要

Mobile WiMAX (Mobile Worldwide Interoperability for Microwave Acces), is a wireless broadband standard which promised high bandwidth over Long-range transmission.It is OFDM-based technology that supports point to multi-point (PMP) Broadband Wireless Access (BWA). Main application of mobile WiMAX today is for MAN/WAN base stations and link stations with both Line of sight (LOS) communication in the range of 10-66GHz (802.16c) and Non-LOS communication in the range of 2-11GHz (802.16a & 802.16d. The major problem in the WiMAX system is that as the bit error rate (BER) increasethe signal to noise ratio (SNR) decrease. So, there is great necessity to optimize the BER to increase the WIMAX performances. In this paper, the performance of mobile WiMAX physical layer using MCCDMA (Multi-Carrier Code Division Multiple Access) as transmission technique is simulate, analyze and compared to the standard mobile WiMAX (IEEE 802.16e). The simulation results include the performance analysis based on bit error rate (BER) versus bit energy to noise rate (E_b/N_o) plots of different modulation and channel coding schemes according to the standard IEEE 802.16e. The results show that MC-CDMA outperforms OFDM in WiMAX system and enhances the performance more when spreading facto (SF) increases.