Cooperative relaying communication scheme for maximizing quality of service

Abstract

Wireless communication channel has characteristics of limited bandwidth and power, multi-user interference and unreliable signal due to fading effect of the channel. To overcome those characteristics and achieve lower power consumption, higher transmission rate, and reliability, considerable algorithms and schemes have been studied. Cooperative relaying communication, one of the studied schemes, can be said to be one of the best schemes providing solution to overcome those characteristics of the wireless channel. The basic idea of cooperative relaying communication is to take advantages of MIMO systems, using multiple mobiles which have only single antenna. Therefore, it can reduce the fading effect by diversity gain and get better performance of BER by coding gain. In sum, the cooperative relaying communication is a very popular and important technology which can satisfy users`` QoS(Quality of Service) such as BER, outage probability, in high rate and high quality multimedia services environment. There are lots of popular issues, but we discuss focused on two most important and popular issues which are partner selection and mode selection problem. First of all, the partner selection problem is the most basic problem to realize the cooperative relaying communication. The Quality of Service(QoS) in the cooperative relaying communication mainly depends on that which mobile node to be selected as a partner for the source node. We propose and analyze novel scheme for more effective partner selection. Related to the mode selection problem, there are two basic cooperative relaying schemes which are Amplify and Forward(AF) and Decode and Forward(DF). Those two schemes can be applied to two transmission models such as multi-hop without diversity and multi-hope with diversity effect. Herein, we propose a new cooperative relaying mode selection scheme which can select the appropriate cooperation relaying scheme for satisfying the user``s Quality of Service(QoS) in term...