Diversity protocol of cooperative diversity technology

In nowaday wireless communications, spatial diversity can greatly extend the channel capacity. But with the physical limitation of the mobile terminal, it is hardly realized. Cooperative diversity, which comes from spatial diversity, can easily achieve the intention of spatial diversity by connecting the other mobile terminals to form a virtual multiple antenna arrays. In this paper, the conception and the communication process of cooperative diversity are first introduced. Then we describe several coorperation protocols, make a conclusion and put out some problems which need to be resolved.