| 黄庭培*,于向洋**,李世宝**,刘建航*.标签到标签通信系统中相位对消问题研究[J].高技术通讯(中文),2023,33(3):243~250 |
| 标签到标签通信系统中相位对消问题研究 |
| Research on phase cancellation in tag-to-tag communication system |
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| DOI：10. 3772/ j. issn. 1002-0470. 2023. 03. 002 |
| 中文关键词: 反向散射;相位对消;标签到标签通信;三电平二进制调制;非对称星座图 |
| 英文关键词: backscatter, phase cancellation, tag-to-tag communication, three-level binary modulation, asymmetricconstellation |
| 基金项目: |
| 作者 | 单位 | | 黄庭培* | (* 中国石油大学(华东)计算机科学与技术学院 青岛266580)(**中国石油大学(华东)海洋与空间信息学院 青岛266580) | | 于向洋** | (*中国石油大学(华东)计算机科学与技术学院 青岛266580)(**中国石油大学(华东)海洋与空间信息学院 青岛266580) | | 李世宝** | (*中国石油大学(华东)计算机科学与技术学院 青岛266580)(**中国石油大学(华东)海洋与空间信息学院 青岛266580) | | 刘建航* | (*中国石油大学(华东)计算机科学与技术学院 青岛266580)(**中国石油大学(华东)海洋与空间信息学院 青岛266580) |
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| 中文摘要: |
| 在反向散射标签到标签(BBTT)通信系统中,标签与标签之间通过反向散射和接收环境信号进行通信。来自信号源的环境信号和来自发射标签的反向散射信号在接收标签处产生叠加信号,由于相位的不确定性,在接收标签处可能造成相位对消问题,导致解调错误。首先,本文分析了相位对消问题存在的原因和造成的影响。其次,针对低信噪比(SNR)、接收标签对误符号率(SER)要求高的场景提出基于三电平二进制的二阶调制方案。针对高阶调制下的相位对消问题,本文采用非对称星座图,并在发射标签端采用最小二分法确定延迟并主动增加延迟来降低相位对消问题对解调的影响。最后,设计了动态调制方法以适应不同信道环境下的反向散射通信。仿真实验表明,本文设计的调制方案能有效降低标签到标签反向散射通信的误符号率。 |
| 英文摘要: |
| In the backscatter-based tag-to-tag(BBTT)communication system, tags communicate with each other by backscattering and receiving environmental signals. The ambient signal from the signal source and the backscattering signal from the transmitting tag generate superposition signal at the receiving tag. Due to the uncertainty of phase,phase cancellation may be caused at the receiving tag, resulting in demodulation errors. This paper first analyzes the reason and influence of phase cancellation. Then, a two-order modulation scheme based on three-level binary is proposed for the scenario with low signal to noise ratio (SNR) and high symbol error rate(SER) requirement of receiving tag. In order to solve the problem of phase cancellation under high order modulation, asymmetric constellation diagram is adopted in this paper. The minimum dichotomy method is adopted at the transmitting tag to determine the delay, and increase the delay to reduce the influence of phase cancellation on demodulation. Finally, a dynamic modulation method is designed to adapt to backscattering communication in different channel environments.Simulation results show that the modulation scheme designed in this paper can effectively reduce the symbol error rate of tag to tag backscattering communication. |
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