Robust utilization of feedback information in space-time coding

摘要

Side information in the form of quantized channel feedback information is utilized to improve an orthogonal space-time block code by means of a linear transformation. The feedback link utilizes COVQ quantization in order to provide the transmitter with an estimate of the current channel realization. The channel realization estimate, together with reliability information, is then used in the transmission scheme for determining the appropriate linear transformation. The result is a system which effectively combines conventional transmit beamforming with orthogonal space-time block coding, thereby providing a scheme which is more robust with respect to the errors that originate from the noise in the feedback channel.