| This dissertation surrounding the problems of the seven signal' s modulation-demodulation mode and the realization of high speed FIR filter in software radio, develop the research of modulation automatic recognition and how to boost the operation speed of high order filter. A characteristic parameter based on the bispectrum of instantaneous phase-square is presented, Besides a method used to improve the calculated speed of convolution based on the symmetry of filter' s coefficients is put forward.Software radio is regarded as a revolutionary radio technology, which emerges as microelectronics and computer technologies have developed rapidly in the recent year. The main advantage of software radio is using software to realize the function module, making the communication system break away from the constraint of systematic structure of the hardware. Implementing various of functions by software, it makes evolution more convenient and easily.The traditional communication is in accordance with an appointed modulation pattern, with fixed parameters and hardware structure. So the range of its application is very limited, the abilities of... |
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