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基于导频的FBMC/OQAM系统的信道估计方法
龚帅, 周小平, 李莉, 王珍, 王家南
上海师范大学
摘要:
与正交频分复用(OFDM)技术相比,滤波器组多载波技术(FBMC)拥有更高的频谱利用率以及更容易实现的脉冲整形,被看成潜在的替代OFDM作为未来5G物理层的备选技术方案.然而,在实际应用中,由于FBMC/OQAM系统中滤波器仅仅在实数域满足正交,在虚数域存在固有干扰,所以经典的OFDM信道估计的方法不能直接应用于FBMC/OQAM系统的信道估计中.针对这个问题,给出了一种新的基于离散导频的信道估计方法,该方法将对导频造成干扰的数据块进行分区域处理,在不同区域分别使用不同的干扰消除方案,分步消除固有干扰.通过仿真表明,所提出的方法使得信道估计性能得到了明显改善,提高了FBMC/OQAM系统的性能.
关键词:  信道估计  离散导频  FMBC/OQAM  虚部干扰
DOI:
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Channel estimation method for FBMC/OQAM system based on pilot
GONG Shuai, ZHOU Xiaoping, LI Li, WANG Zhen, WANG Jia′nan
College of Information,Mechanical and Electrical Engineering,Shanghai Normal University
Abstract:
Compared with orthogonal frequency division multiplexing technology (OFDM),filter bank multicarrier (FBMC) technique has higher spectrum using rate and easier achieved pulse shaping.It was seen as a potential replacement for OFDM as future 5G physical layer of alternative technical solutions.However,in practical applications of the estimation of the channelFBMC with offset quadrature amplitude modulation (FBMC/OQAM) system,the FBMC/OQAM system in the filter only orthogonal in the real domain satisfies,there is a natural interference in the imaginary domain,so the classical orthogonal frequency divided multiplex channel estimation methods cannot be directly applied.Aiming at this problem,this paper proposes a new discrete pilot based channel estimation method,in which will be the pilot caused by interference of the data block partition domain processing,in different regions use different interference cancellation scheme,stepwise elimination the imaginary part of interference.The simulation shows that this scheme makes channel estimation performance has been significantly improved,and improve the performance of FBMC/OQAM system.
Key words:  channel estimation  scattered pilot  FMBC / OQAM  imaginary interference