FMT与FBMC/OQAM非正交接入波形共存分析及处理

针对滤波多音调制(filtered multi-tone modulation, FMT)和滤波器组多载波/交错正交幅度调制(filterbank-based multicarrier/offset quadrature amplitude modulation, FBMC/OQAM)波形非正交接入共存问题,提出了应用快速卷积方法进行数值化分析的方案。通过快速卷积方法,在相邻的频段同时产生FMT和FBMC/OQAM信号,以快速傅里叶变换粒度调整保护间隔,得到FMT频谱频点的变化值,构建FBMC/OQAM对FMT系统的干扰矩阵,并提出预编码方案优化滤波器过渡带系数消除干扰。仿真实验表明,快速卷积方法能更精确分析波形之间的干扰,通过所提预编码方案, FMT和FBMC/OQAM信号之间可以高效率共存,波形之间的干扰得到有效抑制,受干扰影响的误码率性能得到有效改善。

Coexistence analysis and processing of FMT and FBMC/OQAM non-orthogonal access waveforms

Aiming at the non-orthogonal access coexistence problem of filtered multi-tone modulation (FMT) and filterbank-based multicarrier/offset quadrature amplitude modulation (FBMC/OQAM) waveforms, this paper proposes a fast convolution method to give numerical analysis. Fast convolution is applied to generate FMT and FBMC/OQAM signals simultaneously in adjacent frequency bands, and the changed frequency spectrum value of the FMT can be obtained by adjusting the guard band at the level of fast Fourier transform bins. Thus the interference matrix of the FBMC/OQAM to the FMT system is constructed accordingly, and a precoding scheme is proposed for transition band weights of the prototype filter to eliminate the interference. Simulation experiments show that the fast convolution method can achieve more accurate analysis of interference between waveforms, by using the proposed precoding scheme, FMT and FBMC/OQAM signals can coexist efficiently, and the interference between waveforms is effectively suppressed. The bit error rate characteristics influenced by interference is improved efficiently.