用蒙特卡洛模拟的方法计算美式期权的价格以及基本描述,相参脉冲串复调制信号，实现了图像的加水印，去噪，加噪声等功能。- Monte Carlo simulation method of calculating the American option price and basic descr iption, Complex modulation coherent pulse train signal, Realize image watermarking, de-noising, plus noise and other functions.