调用S参数进行时域仿真时选择State Space Model还是卷积法？
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1） 一般情况默认的State Space Model会比卷积的拟合误差小，是推荐的方法；
2） State Space Model拟合误差超过10%会报错并终止运行，而卷积发不会；这笔表示卷积法就好，而仅仅是卷积误差通常比较大，所以没有内置卷积终止运行；
3） 对于延迟比较大的S参数，卷积可能要好一些；
4） 在卷积法中，Piecewise Linear Transform的方法会比IFFT好一些。
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