Wimax Adaptive Coding And Modulation Design And Implementation

As per the latest market research report "WiMAX Market Forecast (2006-2010)" by RNCOS, the subscriber base in the Asia Pacific region is expected to cross the 80,000 mark in 2005 and swell to over 3.78 million subscribers through 2009. WiMAX subscribers in the Asia Pacific region would constitute 44% of the worldwide subscribers by 2009. WiMAX has been one of the focuses in the telecommunication development and application without doubt.The work in this paper was grounded by the project of WiMAX PHY & MAC layer FPGA prototype from Shanghai Research Center of Wireless communication, China Academic Science. Focused on the algorithm optimization and hardware implementation of two algorithm modules - A Reed-Solomon (RS) errors and erasures correcting decoder and a 256 points radix-4 FFT/IFFT, the algorithm of WiMAX baseband Adaptive Modulation Coding (AMC) is researched, simulated and implemented based on FPGA.In Chapter Two, the position of RS module and Radix-4 FFT/IFFT in the whole WiMAX modulation and coding system is pointed out firstly. The implementation scheme of this system is then described. Lastly, this system is simulated by MATLAB Simulink, followed by the analysis of the simulation results.In Chapter Three, the fundamental concepts of RS code and finite field are given firstly as well as the efficient implementation detail of adder and multiplyer in finite field. Then the detailed VLSI implementation of RS coder and decoder are stated. The algorithm of error and erasure correcting RS decoder has been optimized due to the AMC character in IEEE 802.16d, which makes this part the key point of the total design. In the end, this module is tested based on StratixII EP2S60 by Agilent 1682A logic analyzer, and the test result has been compared with several similar decoders in some latest papers.Chapter Four states the efficient implementation of a 256 point Radix-4 FFT/IFFT module. The algorithm for hardware design is described in detail. Test result based on StratixII EP2S60 chip by Agilent 1682A logic analyzer is also given in the end of this chapter.Chapter Five is a summery of the work and contribution in this paper, as well as a prospect of works in the future.