AN EFFICIENT CHANNEL ESTIMATION METHOD USIG SUPERIMPOSED TRAINING FOR EQUALIZATION IN UPLINK OFDMA SYSTEMS

摘要

The present invention relates to channel estimation in uplink OFDMA systems and in particular to an efficient channel estimation method involVing superimposed training for equalization in uplink OFDMA systems. The method is also directly applicable to the uplink in important linearly pre-coded versions of OFDMAlike SC-FDMA. Importantly, the invention prOVidesfor the first time iterative time domain least squares based channel estimation method of superimposed training based uplink OFDMAj SC-FDMAwherein the training sequence for such channel estimation is optimal in terms of BER minimization. Hence the method according to the present invention is of improved accuracy and is well suited for practical implementation. The method of the invention can have wide application in various wireless communication systems and enabled devices, cellular systems, handheld devices, computers, PDAsand cell phones and the like.