Decision feedback IBI mitigation in OFDM systems

Wen-Rong Wu, Chao Yuan Hsu

研究成果: Conference article同行評審

6 引文 斯高帕斯(Scopus)

摘要

When the channel response is longer than the guard interval in OFDM systems, inter-block interference (IBI) will occur and the desired circular convolution property (the transmit symbol and the channel response) will not hold. These problems can seriously degrade the performance of OFDM systems. In this paper, we combine the decision feedback and cyclic reconstruction techniques with an iterated channel estimate method to remedy these problems. We consider pilot-tone based OFDM systems operating in fading channel environments. We derived a least-squares (LS) channel estimation and the optimal frequency domain equalizer (FEQ). Since the computational complexity of the optimal FEQ is high, we then use a simple suboptimal one. Incorporating with decision feedback and cyclic reconstruction, we obtain an iterated IBI mitigation method. Simulations based on a modified DVB-T specification demonstrate that the proposed method can effectively reduce the IBI and enhance the overall system performance.

原文English
文章編號1465163
頁(從 - 到)2619-2622
頁數4
期刊Proceedings - IEEE International Symposium on Circuits and Systems
DOIs
出版狀態Published - 23 5月 2005
事件IEEE International Symposium on Circuits and Systems 2005, ISCAS 2005 - Kobe, Japan
持續時間: 23 5月 200526 5月 2005

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