DXF轨迹图转G代码，有 直线，圆，圆弧，样条曲线，优化多段线，多段线。与下位机串口通讯！无法编译，是因为要先注册mscomm控件-DXF trajectories turn the G-code, line, circle, arc, spline curves to optimize the polyline, polyline. With lower serial communications! Not compile because the first registered mscomm

OFDM下的信道估计，在频率选择性rayleigh信道下五条多径下测试，并作出信道估计性能曲线(The channel estimation under OFDM is tested under five multipaths under the frequency selective Rayleigh channel, and the channel estimation performance curve is made.)