FMT与FBMC/OQAM非正交接入波形共存分析及处理

doi:10.3969/j.issn.1001-506X.2020.06.26

摘要/Abstract

摘要：

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。

关键词: 波形共存, 滤波多音调制, 快速卷积, 预编码

Abstract:

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.

Key words: waveform coexistence, filtered multi-tone modulation (FMT), fast convolution, precoding

中图分类号:

TN92

邵凯, 高世雄, 王光宇. FMT与FBMC/OQAM非正交接入波形共存分析及处理[J]. 系统工程与电子技术, 2020, 42(6): 1402-1409.

Kai SHAO, Shixiong GAO, Guangyu WANG. Coexistence analysis and processing of FMT and FBMC/OQAM non-orthogonal access waveforms[J]. Systems Engineering and Electronics, 2020, 42(6): 1402-1409.

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调制方式	\| l \|
调制方式	0	1	2	3	4	5	6	7
OFDM	-00.87	-12.01	-19.72	-23.55	-25.97	-27.65	-28.82	-29.91
FBMC/OQAM	-00.58	-11.95	-65.02	-80.30	-89.22	-95.68	-100.80	-105.08
FMT	-00.49	-10.31	-73.67	-82.87	-90.52	-96.81	-101.34	-106.34

保护间隔/FFT bins	边缘第1频点位置	边缘第2频点位置	边缘第3频点位置	边缘第4频点位置	边缘第5频点位置	边缘第6频点位置	边缘第7频点位置
10	-33.307 3	-26.715 5	-19.961 0	-15.226 2	-11.393 0	-8.147 5	-5.940 1
8	-19.873 9	-15.222 7	-11.392 7	-8.148 4	-5.939 5	-4.533 6	-3.053 7
6	-11.388 9	-8.146 8	-5.939 2	-4.532 6	-3.054 2	-1.793 1	-1.429 3
4	-5.938 0	-4.530 9	-3.054 5	-1.793 2	-1.429 5	-0.863 1	-0.477 0
2	-3.055 5	-1.793 9	-1.429 5	-0.862 9	-0.476 9	-0.629 0	-0.469 2
0	-1.427 6	-0.863 3	-0.777 4	-0.628 6	-0.468 9	-0.375 5	-0.361 8

参数	FBMC/OQAM	FMT
映射方式	OQAM	QAM
子信道数J	8	8
子载波中心N/FFT bins	16	8
子载波间隔d_f/FFT bins	16	16
子载波带宽d_v/FFT bins	32	8
子载波起始频点B/FFT bins	165	300
子载波通带起点p_o/FFT bins	165	300
子载波通带终点p₁/FFT bins	181	308
保护带间隔G/FFT bins	8
仿真环境	高斯白噪声信道

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