Performance enhancement of mobile networks using cooperative MIMO technique

It is well known that Multiple-Input Multiple-Output (MIMO) system provides both spatial and diversity gains by using multiple antennas at both mobile and base stations. However, the mobile station cannot effort multiple antennas due to small and limited dimension. Therefore, the MIMO technique cannot be successfully operated. In this light, the cooperative MIMO technique enables a mobile user with single antenna to realize a virtual multiple antennas by using the antennas of neighboring users. As a result, the mobile user can experience the full benefits of MIMO system. In literatures, the cooperative MIMO technique using Space-Time Block Codes (STBC) is created by the relay capability of neighbor users. However, the devices of all users have the same potential to detect symbols. Therefore, this paper proposes the STBC scheme by changing the symbol order from source to relay in order to be easily performed as MIMO at the destination. The simulation results reveal that it is possible to obtain a better error performance as well as a higher channel capacity by using the proposed scheme for mobile cellular networks.