communication error 连线错误。关闭打印机电源，拔下数据线，更换USB端口，或者更换数据线，重新连接好。如果你还是无法解决，可以远程为你完成清零操作。
您好！这个是是打印机驱动有问题，没有连接上，进入官网下载打印机驱动重新安装就可以了
A code-nulling method is included for interference cancellation and enhanced signal separation by exploiting the spectral diversity of the various sources. The basic system may be extended to include multi-element antenna array nulling methods also for interference cancellation and enhanced signal ...