UFMC系统载波干扰抑制改进算法

Improved algorithm of carrier interference suppression in UFMC system

针对ICI自消除算法导致UFMC系统频带利用率过低的问题,提出一种联合部分自消除和加升余弦窗的改进方案。该方案具体通过在UFMC系统发射端子带边界插入自消除子载波,并在UFMC系统接收端进行时域加窗来达到抑制UFMC系统干扰、提升系统频带利用率的目的。对算法进行MATLAB仿真实验,当子带两侧设置4个自消除子载波时,相较自消除算法,系统载波干扰比增大,同时系统的频谱利用率也提升了10%。仿真结果表明,所提算法能够有效抑制ICI,提高系统抗干扰性能,同时提升系统频带利用率。

For the problem that the ICI self-cancellation algorithm leads to the underutilization of the UFMC system frequency band,this paper proposed an improved scheme that combines partial self-cancellation and raised cosine windows. This scheme specifically inserted the self-eliminating sub-carriers into the UFMC system’s transmitting terminal band boundary,and performed windowing in the time domain at the receiving end of the UFMC system to achieve the purpose of suppressing UFMC system interference and improving system band utilization. This paper conducted simulation experiments of the algorithm on MATLAB platform. There were four self-cancelled sub-carriers on both sides of the sub-band,the system carrier-to-interference ratio increased compared with the self-cancellation algorithm,and the spectrum utilization of the system also increased by 10%.The simulation results show that the proposed algorithm can effectively suppress ICI, improve the system’s anti-jamming performance,and improve the system bandwidth utilization.