This paper investigates a new approach to the adaptation of the WiMAX IEEE802.16d baseband, the physical layer performance of wireless communications systems based on OFDM multiwavelet transform, using half values of coding rates, 16-QAM, and DMWT-OFDM by being applied to the SFF SDR development platform. In the new structure of WiMAX IEEE802.16d baseband, is reduce further the level of interference, and spectral efficiency is increased. The proposed design was model tested, and its performance was found to comply with International Telecommunications Union channel (ITU) models that have been elected for the wireless channel in the simulation process. The simulation approved the proposed design which achieved much lower bit error rates, increased signal-to-noise power ratio (SNR), robustness for multipath channels and does not require cyclically prefixed guard interval and have higher spectral efficiency than OFDM based on DWT and FFT also can be used as an alternative conventional OFDM in WiMAX IEEE802.16d baseband. 1. Introduction Over the recent years, there has been important and growing demand for greater bandwidth. The problem with the existing transmission media similar fiber, coaxial and twisted pair is costly and complex to layout in rural areas. A solution to this problem is given by IEEE standard 802.16, famous as WiMax. WiMax could possibly erase the suburban and rural blackout areas that currently have no broadband internet access. WiMax short for “Worldwide Interoperability for microwave access” is the broadband internet technology which is growing quickly across the world. The frequency spectrum for WiMax has given by the IEEE is 2–11？GHz. The wireless communications industry is gaining momentum in both fixed and mobile applications. The nonstop increase in demand for all types of wireless services (voice, data, and multimedia) is fueling the require for higher capacity and data rates not only in fixed but too in mobile applications. WLANs and 3G cellular networks are undergo several problems for obtaining a complete mobile broadband access, bounded by factors such as bandwidth, coverage area, or structure costs. In this context, WiMAX appears to accomplish these requirements, providing vehicular mobility and high service areas and data rates. Defined to provide broadband wireless access, it is increasingly gaining concern as an alternative last-mile technology to DSL lines and cable modems, and a complete technology where wireless networks are not enough developed. IEEE 802.16d was developed for WiMAX wireless communication, which is
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