By adding more nodes, the computing ability of the cluster is increasing almost lineally, if the back end database or other information systems are powerful enough.

如果后端的数据库系统或其他的信息系统足够的强大，那么通过增加更多的节点，集群的计算能力可以得到线性的增长。

The requirements for modulation techniques to digital mobile communication system are presented and the improved lineally digital modulation schemes are also briefly described.

本文讨论了数字移动通信系统对调制技术的要求，着重分析了数字线性调制及其改进方案。