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

• 作者: JI Pengfei SHI Qingzhan LV Huan YUAN Naichang
• 来源期刊: 系统工程与电子技术（英文版）
• 年，卷（期）: 2022,（2）
• 所属期刊栏目: DEFENCE ELECTRONICS TECHNOLOGY
• 页码范围: 330-339
• 页数: 10页
• 语种: 英文
• DOI: 10.23919/JSEE.2022.000034

摘要

This paper proposes a method to improve the spu-rious-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 co-ver 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 in-stantaneous dynamic range without sacrificing the real-time per-formance 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 re-ceiver can deal with up to eight simultaneous arrival signals. In general, the designing method proposed in this paper has a po-tential engineering value.