Systems Engineering and Electronics ›› 2025, Vol. 47 ›› Issue (11): 3598-3611.doi: 10.12305/j.issn.1001-506X.2025.11.09
• Sensors and Signal Processing • Previous Articles
Joint suppression method of ambiguity function sidelobe in 5G signals via blockwise reconstruction and decorrelation
Shuai MA1,2(
), Zeqi YANG1,2(), Kai CHANG3(), Ning LIU3(), Xiaode LYU1,*()
- 1. National Key Laboratory of Microwave Imaging，Aerospace Information Research Institute，Chinese Academy of Sciences，Beijing 100190，China
2. School of Electronic，Electrical and Communication Engineering，University of Chinese Academy of Sciences，Beijing 100049，China
3. Unit 32802 of the PLA，Beijing 100083，China
-
Received:2025-03-18Accepted:2025-07-01Online:2025-11-25Published:2025-12-08 -
Contact:Xiaode LYU E-mail:mashuai22@mails.ucas.ac.cn;yangzeqi22@mails.ucas.ac.cn;kerkaichance@gmail.com;978599056@qq.com;lvxd@aircas.ac.cn
CLC Number:
Cite this article
Shuai MA, Zeqi YANG, Kai CHANG, Ning LIU, Xiaode LYU. Joint suppression method of ambiguity function sidelobe in 5G signals via blockwise reconstruction and decorrelation[J]. Systems Engineering and Electronics, 2025, 47(11): 3598-3611.
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Table 1
Frequency bands and bandwidth selection range for 5G signal defined by standards"
| FR频段 | 对应的频率范围/GHz | 定义的最大信道 带宽/MHz |
| FR1 | 0.41~7.125 | 100 |
| FR2 | 24.25~52.6 | 400 |
Table 1
Fig.1
5G signal wireless frame structure in FR1 band"
Fig.1
Table 2
5G NR supported SCS and symbol length in FR1 band"
| 子载波间隔/kHz | OFDM符号长度/μs | NCP长度/μs |
| 15 | 66.67 | 4.69 |
| 30 | 33.33 | 2.34 |
| 60 | 16.67 | 1.17 |
Table 2
Fig.2
SSB structure in 5G synchronization signal"
Fig.2
Table 3
5G downlink signal parameter configuration"
| 参数名 | 参数设置 |
| 信号链路 | 下行链路 |
| 频谱范围 | FR1 |
| 调制方式 | 16QAM |
| 信道带宽/MHz | 20 |
| 信号SCS/kHz | 15 |
| SSB/PBCH周期/ms | 5 |
| 信号帧长度/ms | 30 |
Table 3
Fig.3
Simulated 5G signal ambiguity function"
Fig.3
Fig.4
5G signal ambiguity function range dimension plots in different SCSs"
Fig.4
Table 4
5G signal time-delay dimension sidelobe positions for different SCSs"
| SCS/kHz | OFDM符号长度/μs | 距离维副峰位置/μs |
| 15 | ||
| 30 | ||
| 60 |
Table 4
Fig.5
5G signal ambiguity function Doppler dimension plot"
Fig.5
Table 5
Time domain position of SSB in different Cases"
| 模式 | n的取值 | 位置索引 | |
| Fc | 3 GHz | ||
| 模式A（15 kHz） | n=0,1 | n=0,1,2,3 | {2,8}+14n |
| 模式B（30 kHz） | n=0,1 | n=0,1 | {4,8,6,20}+28n |
| 模式C（60 kHz） | n=0,1 | n=0,1,2,3 | {2,8}+14n |
Table 5
Fig.6
SSB time-domain position in one period"
Fig.6
Fig.7
Schematic diagram of blockwise reconstruction fast ambiguity function computation method"
Fig.7
Fig.8
Integrated processing flow of sidelobe peak interference suppression"
Fig.8
Table 6
Simulation parameter configuration for 5G signal sidelobe suppression"
| 参数名 | 参数设置 |
| 信号链路 | 下行链路 |
| 频谱范围 | FR1 |
| 调制方式 | 16QAM |
| 信道带宽/MHz | 20 |
| 信号SCS/kHz | 15 /30 /60 |
| SSB/PBCH周期/ms | 5 |
| 信号帧长度/ms | 30 |
| SSB/PBCH映射类型/kHz | 模式A：15 |
| 模式B：30 | |
| 模式C：60 | |
| OFDM符号长度/μs | 模式A：16.67 |
| 模式B：33.33 | |
| 模式C：66.67 |
Table 6
Fig.9
Comparison of 5G signal ambiguity function plots before and after sidelobe suppression （Case A）"
Fig.9
Fig.10
Comparison of 5G signal ambiguity function plots before and after sidelobe suppression （Case B）"
Fig.10
Fig.11
Comparison of 5G signal ambiguity function plots before and after sidelobe suppression （Case C）"
Fig.11
Table 7
Changes in amplitude of sidelobe in range-dimensional before and after sidelobe suppression of 5G signal"
| 模式 | SCS/kHz | 距离维副峰 | |||
| 副峰 位置/μs | 抑制前 幅度/dB | 抑制后 幅度/dB | 副峰 抑制比/dB | ||
| 模式A | 15 | 66.67 | 18.05 | 3.61 | 14.44 |
| 模式B | 30 | 33.33 | 23.76 | 18.91 | 4.85 |
| 模式C | 60 | 16.67 | 29.06 | 22.64 | 6.42 |
Table 7
Table 8
Changes in amplitude of sidelobe in Doppler-dimensional before and after sidelobe suppression of 5G signal"
| 模式 | 副峰 周期/Hz | 副峰抑制 | 主峰 幅度/dB | 副峰 幅度/dB | 峰值 旁瓣比/dB |
| 模式A | 200 | 处理前 | 41.11 | 17.47 | −23.64 |
| 处理后 | 40.46 | 6.10 | −34.36 | ||
| 模式B | 200 | 处理前 | 47.02 | 23.76 | −23.26 |
| 处理后 | 46.26 | 14.93 | −31.33 | ||
| 模式C | 200 | 处理前 | 52.51 | 29.06 | −23.45 |
| 处理后 | 52.11 | 23.66 | −28.45 |
Table 8
Fig.12
Doppler ambiguity function of 5G signal before and after processing with the proposed method"
Fig.12
Table 9
Changes in Doppler-dimensional sidelobe amplitude of 5G signal before and after processing in different SSB cycles with the proposed method"
| SSB周期/ms | 多普勒副峰 周期/Hz | 抑制前 幅值/dB | 抑制后 幅值/dB | 副峰 抑制比/dB |
| 5 | 200 | 17.473 | 6.095 | 11.378 |
| 10 | 100 | 17.527 | 6.526 | 11.001 |
| 20 | 50 | 14.617 | 6.586 | 8.031 |
| 40 | 25 | 14.688 | 6.733 | 7.955 |
| 80 | 12.5 | 17.527 | 6.657 | 10.87 |
| 160 | 6.25 | 16.768 | 6.852 | 9.916 |
Table 9
Fig.13
Range-Doppler ambiguity function results of 5G signals processed with the proposed method in Case A"
Fig.13
Fig.14
Target detection results of 5G signals before sidelobe suppression"
Fig.14
Fig.15
Target detection results of 5G signals after sidelobe suppression"
Fig.15
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