A method of improving SFDRs of 1-bit signals for a monobit receiver

doi:10.23919/JSEE.2022.000034

Journal of Systems Engineering and Electronics ›› 2022, Vol. 33 ›› Issue (2): 330-339.doi: 10.23919/JSEE.2022.000034

收稿日期:2021-03-01 出版日期:2022-05-06 发布日期:2022-05-06

A method of improving SFDRs of 1-bit signals for a monobit receiver

Pengfei JI(), Qingzhan SHI*(), Huan LV(), Naichang YUAN()

¹ School of Electronic Sciences, National University of Defense Technology, Changsha 410073, China

Received:2021-03-01 Online:2022-05-06 Published:2022-05-06
Contact: Qingzhan SHI E-mail:pfji@foxmail.com;qingzhanshi@foxmail.com;68107745@qq.com;yuannaichang@hotmail.com
About author:|JI Pengfei was born in 1993. He received his B.S. degree from University of Electronic Science and Technology of China in 2015, and M.S. degree from the School of Electronic Sciences, National University of Defense Technology in 2018, where he is currently pursuing his Ph.D. degree. His research interests include monobit signal processing in electronic detection and interference. E-mail: pfji@foxmail.com||SHI Qingzhan was born in 1990. He received his B.S. degree from University of Electronic Science and Technology of Xi’an in 2015. He received his M.S. and Ph.D. degrees from National University of Defense Technology in 2015 and 2019. He is currently a lecturer with the School of Electronic Sciences, National University of Defense Technology. His research interests include radar signal processing and electronic countermeasures. Email: qingzhanshi@foxmail.com||LV Huan was born in 1993. She received her B.S. degree from University of Electronic Science and Technology of China in 2015. Now she is studying for her M.S degree in the School of Electronic Sciences, National University of Defense Technology. Her main research direction is unmanned aerial vehicles (UAV) communication. E-mail: 68107745@qq.com||YUAN Naichang was born in 1965. He received his M.S. and Ph.D. degrees in electronic science and technology from University of Electronic Science and Technology of China in 1991 and 1994, respectively. He is currently a professor with the School of Electronic Sciences, National University of Defense Technology. His research interests include antenna and radome technology, electromagnetic analysis, high-resolution radar signal processing, and jamming and anti-jamming technology. E-mail: yuannaichang@hotmail.com

摘要/Abstract

Abstract:

This paper proposes a method to improve the spurious-free dynamic ranges (SFDRs) of 1-bit sampled signals greatly, which is very beneficial to multi-tone signals detection. Firstly, the relationship between the fundamental component and the third harmonic component of 1-bit sampled signals is analyzed for determining four contiguous special frequency bands, which do not contain any third harmonics inside and cover 77.8% of the whole Nyquist sampling frequency band. Then, we present a special 4-channel monobit receiver model, where appropriate filter banks are used to obtain four desired pass bands before 1-bit quantization and each channel can sample and process sampled data independently to achieve a good instantaneous dynamic range without sacrificing the real-time performance or computing resources. The simulation results show that the proposed method effectively eliminates the effect of the most harmonics on SFDRs and the mean SFDR is increased to to 20 dB. Besides, the multi-signals simulation results indicate that the maximum amplitude separation (dynamic range) of two signals in each channel is 12 dB while the proposed monobit receiver can deal with up to eight simultaneous arrival signals. In general, the designing method proposed in this paper has a potential engineering value.

Key words: 1-bit signal, monobit, third harmonic component, spurious-free dynamic range (SFDR)

. [J]. Journal of Systems Engineering and Electronics, 2022, 33(2): 330-339.

Pengfei JI, Qingzhan SHI, Huan LV, Naichang YUAN. A method of improving SFDRs of 1-bit signals for a monobit receiver[J]. Journal of Systems Engineering and Electronics, 2022, 33(2): 330-339.

图/表 10

参考文献 36

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Variable	Specification
f_left	The left border of the evaluated frequency band (evaluated value)
f_right	The right border of the evaluated frequency band (evaluated value)
f_s	The sampling rate (known value)
f	The frequency of the fundamental component (variable value)
f_3rd	The frequency of the actual third harmonic component (variable value)

Parameter	Filter
Parameter	Filter 1	Filter 2	Filter 3	Filter 4
Fstop1	2.182	6.626	9.960	13.293
Fpass1	2.222	6.666	10.000	13.333
Fpass2	6.666	10.000	13.333	17.777
Fstop2	6.706	10.040	13.373	17.817

SFDR/dB	Proportion
SFDR/dB	Proposed way	Traditional way
≥10	100.00	23.43
≥11	100.00	1.11
≥12	100.00	1.08
≥13	100.00	1.07
≥14	95.80	1.02
≥15	92.32	0.96
≥16	89.89	0.96
≥17	79.77	0.94
≥18	71.21	0.91
≥19	66.13	0.89
≥20	60.11	0.86
≥21	56.04	0.84
≥22	50.01	0.82

SFDR/dB	Proportion under different SNRs
	Proposed way							Traditional way
	–5/dB	0/dB	5/dB	10/dB	15/dB	20/dB	30/dB	–5/dB	0/dB	5/dB	10/dB	15/dB	20/dB	30/dB
≥10	84.4	100.0	100.0	100.0	100.0	100.0	100.0	0	100.0	100.0	100.0	88.5	38.6	24.5
≥11	28.3	100.0	100.0	100.0	100.0	100.0	100.0	0	99.9	100.0	100.0	28.2	1.9	1.0
≥12	1.1	100.0	100.0	100.0	100.0	100.0	100.0	0	58.0	100.0	100.0	1.0	1.0	1.0
≥13	0	99.9	100.0	100.0	100.0	100.0	100.0	0	0	100.0	58.2	1.0	1.0	1.0
≥14	0	99.9	100.0	100.0	98.2	96.7	95.9	0	0	100.0	12.5	1.0	0.9	0.8
≥15	0	99.9	100.0	98.8	93.7	92.6	92.3	0	0	100.0	1.0	1.0	0.8	0.7
≥16	0	92.6	100.0	94.4	91.9	91.9	90.0	0	0	96.3	1.0	1.0	0.7	0.7
≥17	0	51.4	100.0	91.9	91.6	85.4	80.1	0	0	42.5	1.0	0.9	0.7	07
≥18	0	8.2	99.9	91.9	84.8	73.5	71.3	0	0	0.1	0.9	0.8	0.7	0.6
≥19	0	0.2	96.7	91.9	72.9	69.3	66.2	0	0	0	0.9	0.7	0.7	0.6
≥20	0	0	91.9	90.4	70.3	62.9	59.8	0	0	0	0.8	0.7	0.7	0.6
≥21	0	0	90.6	83.5	66.6	58.9	55.8	0	0	0	0.7	0.6	0.6	0.6
≥22	0	0	70.8	73.0	60.6	56.1	50.3	0	0	0	0.3	0.6	0.6	0.6

Magnitude of the 2nd signal vs. the 1st signal	Channel I [2.223,6.667] GHz		Channel II [2.223,6.667] GHz		Channel III [2.223,6.667] GHz		Channel IV [2.223,6.667] GHz
Magnitude of the 2nd signal vs. the 1st signal	1st signal detection	2nd signal detection	1st signal detection	2nd signal detection	1st signal detection	2nd signal detection	1st signal detection	2nd signal detection
0 dB	100.0000	100.0000	99.9999	99.9951	100.0000	99.9961	100.0000	99.9999
?1 dB	100.0000	99.9999	100.0000	99.9863	100.0000	99.9845	100.0000	99.9998
?2 dB	100.0000	99.9996	100.0000	99.9242	99.9999	99.9138	100.0000	99.9996
?3 dB	99.9998	99.9978	100.0000	99.7958	100.0000	99.7878	100.0000	99.9989
?4 dB	100.0000	99.9877	100.0000	99.6609	99.9999	99.6236	100.0000	99.9889
?5 dB	100.0000	99.8867	99.9999	99.4307	100.0000	99.4196	100.0000	99.8969
?6 dB	100.0000	99.3148	100.0000	98.7302	100.0000	98.7005	99.9999	99.3400
?7 dB	100.0000	98.0855	100.0000	97.3252	100.0000	97.2937	100.0000	98.0992
?8 dB	100.0000	96.3991	100.0000	95.4919	100.0000	95.4762	100.0000	96.4031
?9 dB	100.0000	94.5861	99.9999	93.5147	100.0000	93.4423	100.0000	94.6075
?10 dB	100.0000	92.7778	100.0000	91.4837	100.0000	91.3897	100.0000	92.7628
?11 dB	100.0000	90.9595	100.0000	88.6743	100.0000	88.6289	100.0000	91.0153
?12 dB	99.9999	89.1601	100.0000	83.4579	100.0000	83.3371	100.0000	89.1434
?13 dB	100.0000	87.0479	100.0000	76.8947	100.0000	76.7676	100.0000	87.0563
?14 dB	100.0000	83.5611	100.0000	71.3506	100.0000	71.3038	100.0000	83.6230
?15 dB	100.0000	77.1919	100.0000	65.3075	100.0000	65.2534	100.0000	76.9852
?16 dB	99.9999	67.1489	99.9998	57.2727	100.0000	57.5192	100.0000	66.9188
?17 dB	100.0000	54.1867	100.0000	46.8185	100.0000	47.1026	100.0000	53.8015
?18 dB	100.0000	39.5937	100.0000	34.3705	100.0000	34.7538	100.0000	39.1649

A method of improving SFDRs of 1-bit signals for a monobit receiver

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