A circulant based space-time coding for multiple input multiple output system in fading channels

In this paper a new space time coding, which is suitable for high data rate communications is proposed. In this approach data is encoded by using a decomposition of a circulant matrix and the output of encoder is splitted into N streams to be transmitted simultaneously to N transmit antennas. The performance of this multiple input multiple output system is evaluated in a Rayleigh fading channel. Its performance in terms of symbol error rate, diversity gain and complexity is obtained. Simulation results show that with a perfect channel estimator, when channel state information (CSI) is available at the receiver, the Circulant Space Time code (CSTC) has a better symbol error rate via signal to noise ratio in compared to the spatial multiplexing and near to orthogonal space time block code.