Time-varying Channel Estimation with Inter-carrier Interference Mitigation in Underwater OFDM Systems

被引：0
|
作者：
Liao, Jialing [1 ,2 ]
Qiao, Gang [1 ,2 ]
Ma, Xuefei [1 ,2 ]
Zhou, Feng [1 ,2 ]
Zhang, Jiarong [1 ,2 ]
Wang, Wei [1 ,2 ]
机构：
[1] Harbin Engn Univ, Sci & Technol Underwater Acoust Lab, Harbin, Heilongjiang, Peoples R China
[2] Harbin Engn Univ, Coll Underwater Acoust Engn, Harbin, Heilongjiang, Peoples R China
来源：
OCEANS 2014 - TAIPEI | 2014年
基金：
中国国家自然科学基金;
关键词：
OFDM; ICI; channel estimation; interference auto-cancellation; differential coding; UWAC; DOUBLY SELECTIVE CHANNELS; RECEIVERS; ICI;
D O I：
暂无
中图分类号：
U6 [水路运输]; P75 [海洋工程];
学科分类号：
0814 ; 081505 ; 0824 ; 082401 ;
摘要：
Channel variations caused by motility would introduce inter-carrier interference (ICI), which degrades channel estimation and data detection in underwater orthogonal frequency division multiplexing (OFDM) systems. To deal with this problem, a joint time-varying channel estimation and inter-carrier interference mitigation method is proposed in this paper, where time domain channel estimation and interference auto-cancellation are merged into an iterative scheme. Meanwhile, linear approximation is used to track the time-varying channel while interference auto-cancellation is achieved via pre-coding to reduce the sensibility of OFDM systems to frequency shifts. Unlike frequently-used opposite or conjugate mapping, which leads to an inevitable decrease in frequency utility ratio, differential coding is introduced for pre-coding without adding redundancy. Simulations show that the proposed algorithm can accurately estimate channel state information (CSI), and robustly mitigate ICI over time-varying underwater acoustic channels (UWAC).
引用
收藏
页数：6
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