国外的详细的OFDM设计过程文档，对学习OFDM非常有帮助，并且有仿真结果。-This report discusses the design and implementation of an OFDM modem for a simplex communication between two PCs over a frequency selective channel. First a brief introduction is provided by explaining the b

通过BLOCK方式访问Shadow Ram-Visit Shadow Ram way through BLOCK

发票打印功能，还没写完，只完成一部分功能，可以直接在界面上修改购贷单位、纳税人识别号等。字体都按正式增值税发票上各区块的字体生成打印。-Invoice printing function, not yet finished, only completed part of the function, can be directly modified buying units, taxpayer identification number on the interface etc.. Font fo