A scheme of HARQ re-sending nodes selection for relay network is purposed in this paper. The study is focused on how to select relay node with minimum resending power under the particular required receiving performance of the destination node. The candidate relay nodes are divided into several regions according to the difference of resending power required. With this selection scheme, the diversity gain and high system power efficiency can all be achieved. The effectiveness of this scheme is proved by the simulation results.

the remote education as a kind of typical mode of education, to meet the needs of the era of a learning society people to acquire knowledge. Has become the public a way of education. The effective selection and the media of education to further expand provides support in various fields. So this article from the media selection strategy and so on has carried on the concrete analysis, analysis of distance education at the same time, combed the strategy research, analyses the advantages and characteristics of media selection.