模拟信号调制方式自动识别仿真

信号调制方式的自动识别足未来软件无线电必须具备的功能之一；以决策理论为基础，介绍了模拟调制信号特征参数的提取、判决门限的确定以及调制方式的判决流程；系统的仿真结果表明，在信噪比SNR=5dB时，基于决策理论的识别方法已具备一定的识别能力，能够较好的识别除VSB之外的其余调制类型；随着信噪比的提高，调制方式的正确识别概率也不断提高;当8NR=10dB时，正确识别概率已经全部达到90％以上。

Simulation of Automatic Recognition of Analogue Modulated Signals

Automatic recognitionof modulation type of a signalis one of the essential functions of future Software Radio. Basedon decision makingtheory, the paper introduces the way of extracting characteristic features, choosing the threshold and the judging method. The simulation result proved that, when SNR is equal to 5dB, the method based on decision theory is already capable in recognizing modulating types except VSB signals. With increasing SNR, the sueeessrate for correct recognition has certainly increased. When SNR is 10dB, the correct recognition rate is already above 90%.