Interference cancellation aided channel estimation for OFDM/OQAM system
Interference cancellation aided channel estimation for OFDM/OQAM system
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DOI：
10.1007/s11432-013-5007-2
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发表时间：
2013-12
期刊：
影响因子：
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通讯作者：
Guobing Cheng;Yue Xiao;Su Hu;Shaoqian Li
中科院分区：
文献类型：
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作者：
Guobing Cheng;Yue Xiao;Su Hu;Shaoqian Li
正交频分复用偏置QAM（OFDM/OQAM）技术具有无需循环前缀（CP）和引入时频局部化脉冲波形的灵活性等优点，是一种很有前途的多载波传输技术。然而，在色散信道条件下，OFDM/OQAM系统会产生固有的符号间和载波间干扰。特别是周围的数据符号会对导频符号造成干扰，导致信道估计误差和系统性能下降。本文提出了一种适用于OFDM/OQAM系统的高效导频结构和信道估计方法。其基本原理是通过预判决在所考虑的导频位置周围重建发射符号，然后计算并消除接收信号中的干扰。分析和仿真结果表明，该方案在信道估计精度和误比特率（BER）性能方面均优于传统方案，同时具有更少的导频消耗。
Orthogonal frequency division multiplexing offset-QAM (OFDM/OQAM) is a promising multicarrier transmission technique for its merits such as operating without cyclic prefix (CP) and flexibility of introducing well time-frequency localized pulse shapes. However, under dispersive channel condition, the intrinsic inter-symbol and inter-carrier interference arises in OFDM/OQAM system. Especially, the surrounding data symbols will cause interferences to the pilot symbols, leading to channel estimation error and degradation of system performance. In this paper, an efficient pilot structure and a channel estimation method are proposed for OFDM/OQAM system. The basic principal is to rebuild the transmitted symbols around the considered pilot position through pre-decision, then calculate and cancel the interference from the received signal. Analysis and simulation results show that the proposed scheme outperforms conventional ones with respect to both channel estimation accuracy and bit error rate (BER) performance while with less pilot consumption.