A Simplified Adaptive Orthogonal DST Coding For CO-MIMO Networks

An adaptive orthogonal distributed space time coding scheme (ODSTC) is proposed in this paper in order to achieve low bit error rate. Amplify and forward technique and ODSTC is used at the relay node.cooperative a MIMO system is used to increase the reliability of wireless communication.ML detector and linear MMSE receiver is used at the destination node. In order to estimate the channel condition of the communication system at the destination node stochastic gradient and least square algorithm are developed in this paper. The estimated code matrix will be given back to relay nodes through feedback channel where the estimated code matrix is used to transform the space time code matrix at the relay nodes. In order to eliminate the feedback error and to save the bandwidth this feedback can be eliminated by the use of fully distributed matrix optimization algorithm. Simulation results show that the proposed algorithm can reduce the bit error rate when compared to other existing space time codes.