International Journal of Modern Engineering Research (IJMER)
In recent years, co-operative networking has received substantial interest from the wireless networking and communications research communities. Many interesting problems for co-operative networks have been actively researched, such as throughput-optimal scheduling, network lifetime maximization, distributed routing and MAC (Medium Access Control) layer protocol design. Although there have been extensive studies concerning co-operative networks, most works on optimizing the performance of cooperative networks are limited by-three-node relay scheme and single-antenna systems. In co-operative networks, it is interesting to explore the idea of deploying multiple antennas at each node. With the multiple antennas, the source and the relays can multiplex independent data streams by exploiting the inherent independent spatial channels.