Concatenated beamspace-time coding for directional wireless channels

The spatial channel models for antenna array communication systems have led to many theories of exploiting spatial diversity in wireless communications and more recently to space-time coding. For example, original space-time coding methods exploit a model that characterizes the spatial channel coefficients independent. Here we propose a space-time coding method that exploits a spatial channel model, which is based on the concentration of multipath signals or the direction of arrival (DOA). While we present this method for two dominant DOA channels, it can be easily extended for channels with more dominant DOAs. As with the original space-time coding methods, the proposed method does not require feedback from receiver to transmitter.