Research On The Realization Technique Of Wavelet Packet Multi-Carriers Modulation And Demodulation Based On FPGA

On the basis of the scientific research of my tutor before, this paper intends to research on the realization of wavelet packet multi-carriers modulation and demodulation based on FPGA. It is well known that signal and information process is one of the fastest developing knowledge in the near 20 years. And FPGA is on the edge of revolutionary digital signal process. The entirely new FPGA series are now more and more being used for operation of front digital signal process instead of ASIC and PDSP. Wavelet theory has been developed just in the near 20 years as a new mathematics theory and method, and it has been applied deeply in many fields. Compared to fourier transform and short time fourier transform, wavelet transform has obvious advantage on analyzing time-variant and non-stable random signal. The multi-carriers modulation technique based on wavelet/wavelet packet transform (wavelet packet modulation, for short) is a new technique of combining wavelet/wavelet packet theory with multi-carriers modulation technique. It adopts the wavelet packet function that has the advantage of good orthogonality and time-frequency limitation as carrier. Multi-carriers modulation of signal transportation can be realized by fast wavelet/wavelet packet transform. It can be seen from both theoretical analysis and software simulations that multi-carriers technique based on wavelet packet transform has unique advantage and great potential in improving the performance of communication system. Realization methods are flexible and various, and fit for communication environment. This paper has realized wavelet packet synthesis and analyse according to Mallat arithmetic based on FPGA, and also realized the channel encoding and decoding and TCM. Circuits designed using FPGA have the characteristics of running fast, low cost, easy development, repeated usage and strong adaptability. And also there are many supporting software, plentiful FPGA chips and lots of IPCore to help to design. Practice proves that FPGA has superiority on channel encoding and decoding and deserves to be studied more deeply and applied to digital signal process.