| Shortwave communication is of many advantages, such as simple equipment, easy to use, long communication distance, mobility, robust and so on, and it is used widely in various areas, especially in the military communications. With the development of digital technology, short wave radio also has changed from the analogy to the digital. Digital short wave radio is gradually realized in baseband, intermediate frequency or radio frequency.For above reasons, at first, base on the theory of shortwave communication, the new Enhanced Four-Dimensional Modulation and Demodulation technology which is of better robustness are introduced and analyzed for theory and realization, the correctness and the high performance are proved by simulation. Then, according to the development of software and hardware technology, digital DUC technology, to include all kinds of interpolation theory and efficient digital filter, are introduced. And the algorithm for the existing hardware and software resources situation is discussed, and this algorithm is improved from efficiency and resource consumption. Finally, the platform based on Cyclone â…¡ FPGA is briefly introduced, the above algorithm is test and optimized in the platform through the Debugging, do some further optimization. The improvement scheme is also given at the end. |
