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The grouping method is an efficient transmitting strategy in a spatial diversity system. In this paper, relay-based grouping methods in satellite terrestrial cooperative wireless networks are proposed. The proposed methods focus on finding out the best two signals received from relay stations in a user’s neighborhood and use the advantage of space diversity to overcome the effect of channel fading. A grouping method, called the pilot-based grouping method was proposed in our previous work. In order to improve the grouping success rate and the channel capacity, a modified grouping method is proposed. In addition, for a single relay the modified grouping method can achieve better results than the pilot-based grouping method. In the end, several analysis strategies of the grouping method for multimedia broadcast and multicast services in satellite terrestrial cooperative networks are proposed. The simulation results show the performance improvement and the system evaluation for different quality of services in the demanded relay-based cooperative networks. The proposed modified grouping methods can be widespread in any relay-based cooperative networks.

In this paper we examine the performance of a satellite-terrestrial cooperative wireless network. We proposed a new grouping method, called pilot-based grouping method, to implement the space-time code in the satellite-terrestrial networks. The proposed method increases the total system channel capacity, and also saves unnecessary transmission power for the terrestrial stations. The proposed method focuses on finding out the best two signals coming from its neighboring terrestrial stations and uses the advantage of space diversity to improve the effect of channel fading. The numerical results show that the performance of ours proposed method is better than traditional grouping method.