D-S证据理论数据融合，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,现代信号处理中谱估计在matlab中的使用。- D-S evidence theory data fusion, Monte Carlo simulation method of calculating the American option price and basic descr iption, Modern signal processing used in the spectral estimation in matlab.