FBMC/OQAM系统部分置零编码辅助导频方案

Partial Zeroed Coding Auxiliary Pilot Scheme for FBMC/OQAM System

FBMC/OQAM系统的正交性只在实数域上满足,存在固有虚部干扰问题,使得准确的信道估计十分困难,为解决固有虚部干扰对系统信道估计的影响,改善系统性能,因此对虚部干扰消除方案进行研究;依托FBMC/OQAM系统中基于干扰消除原理的现有方案,将现有方案中的邻域置零方案、辅助导频方案及编码方案融合均衡,提出一种部分置零编码辅助导频方案;理论分析表明,新提出的方案相较于原有方案在提高频谱利用率的同时,降低了峰均功率比和计算复杂度;通过进一步的系统仿真发现,在相同干扰计算域的前提下,新提出的方案在多径信道中的误比特率和最小均方误差均低于现有方案,具有一定的应用意义。

The orthogonality of FBMC/OQAM system is only satisfied in real number field, and there is inherent imaginary part interference problem, which makes accurate channel estimation very difficult. In order to deal with the influence of inherent imaginary part interference on system channel estimation and improve system performance, the elimination scheme of the imaginary part interference is studied. Depended on the existing scheme of FBMC/OQAM system based on the interference cancellation principle, the neighborhood zeroing scheme, the auxiliary pilot scheme and the coding scheme of the existing scheme are integrated and balanced, then a partially zeroing coding auxiliary pilot scheme is proposed. Theoretical analysis shows that compared with the original scheme, the proposed scheme improves the spectrum utilization, and reduces the peak-to-average power ratio and computational complexity. Further simulation results show that the proposed scheme has lower bit error rate and minimum mean square error in multipath channel than the existing schemes under the same interference computation domain, which has certain application significance.