An efficient OFDM channel estimation method for satellite and intermediate module repeater channels in DMB system

摘要

A noise reduction channel estimation method is needed to improve the performance for digital multimedia broadcasting (DMB) systems with intermediate module repeater (IMR). It is based on correlation channel estimation method with the aid of the time-domain received signal and pilot signal. Channel impulse response can be derived by the output of cyclic correlation directly. Moreover, the information contained in the received signal with the cyclic prefix is made use of in the proposed method at the receiver. However, the errors caused by the coarse channel impulse response estimation degrade the performance severely. The noise reduction method is processed by using the time-averaging of channel impulse responses. The simulation results about the satellite and IMR channels show that the symbol error rate (SER) performance of the proposed method is much better than other conventional methods.