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

• DEFENCE ELECTRONICS TECHNOLOGY • Previous Articles     Next Articles

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

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

  1. 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

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)