With the help of some users' multi -level relay, the center station can communicate with each user int he system.

通过用户站的多级接力，中心站可以和每一个用户站进行通信。系统硬件简单，占用频率资源少，成本低。

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The presented multi-class SVM is of better classification ability and can solve the unclassifiable region problems int.

新的多类SVM在一定程度上解决了传统投票决策方法的不可分区域问题，因此具有更好的分类性能。

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