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

Abstract

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

CLC Number:

TN92

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.

Figures/Tables 12

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References 30

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

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