CHANNEL ESTIMATION METHOD AND DEVICE FOR LONG ECHO IN ESPECIALLY TDS-OFDM SYSTEMS

摘要

The invention regards to a channel estimation method and device for echo in especially TDS-OFDM communication systems, wherein there is estimated a short echo. In addition there is estimated a long echo being longer than the first short echo by executing a long echo range channel estimation, and thereafter the estimation of short echo and the estimation of long echo are combining to get a combined channel estimation. Especially, the short echo estimation is based on clean pseudo random sequence part of received signal (y(i) ) and long echo range channel estimation is based on mixed PN and data part in the received signal (y (i) ).