STTC-OFDM系统中的导频辅助半盲信道估计

STTC-OFDM with Added Pilot Semi-Blind Iterative Channel Estimation

在快衰落信道情况下,基于判决指导信道估计(DDCE)法不能够很好的跟踪信道参数的变化,使得系统性能产生很大的恶化。在这篇论文中,为了防止在快衰落信道中由于信道估计误差带来STTC-OFDM系统性能恶化,我们在每帧除训练符号外的OFDM符号引入导频辅助半盲(APSB)信道估计技术。同时,为了简化系统,我们仅在每帧最后一个符号使用APSB信道估计技术。在本文的最后我们给出了一些结论。

The decislon-directed channd estimation （DDCE） can＇t track the channel variations in fast fading channels, and thus the system performance degradation occurs. In this paper, to prevent the performance degradation for STTC-OFDM system in fast fading channels, it proposes the system that applies the APSB channel estimation to all OFDM data symbol except the preamble of a frame. It also proposes the simplifi.ed system that applies the APSB channel estimation to the last of a frame. At last, it gives some conclusion.