【作者】 徐海翔；

【导师】 邵怀宗；

【作者基本信息】 电子科技大学 ， 电子信息（专业学位）， 2025， 硕士

【摘要】 基于认知的变换域通信系统(Transform Domain Communication System,TDCS)因具有能够识别干扰信号的频谱范围,确定空闲频谱的能力,所以在电子对抗中的通信抗干扰领域得到了应用。但目前的应用主要集中在点对点的通信中,且存在传输速率低的局限。针对这些问题,本文展开了基于时分多址(Time Division Multiple Access,TDMA)协议的TDCS多用户组网协议的研究与设计,本文的主要创新工作如下:1.设计了一种适用于TDCS系统的频谱感知结果交换机制。通过对TDCS系统存在的局限性分析表明,传统的TDCS系统存在频谱效率低和收发端频谱失配等问题。本文对于TDCS系统在收发端频谱失配情况下解调性能较差的问题,对物理层帧头的结构进行了改进,加入了域用于表征频谱感知结果,达到频谱感知结果交换的目的,实现了收发端的频谱感知信息同步。2.设计了基于TDMA机制的多用户认知通信组网协议。将TDCS系统与使用PSK、QAM调制方式的IEEE802.11物理层系统相结合,网络中各用户通过信标帧实现帧同步,并根据频谱感知结果和当前通信成功率进行响应,如切换调制方式和子信道等;同时设计了具有数据分包功能和重传机制的综合应用层,使网络中各个用户能够互传短消息或文件,实现了在复杂环境下的多用户动态灵活组网通信。3.搭建了基于通用软件无线电外设(Universal Software Radio Peripheral,USRP)的半实物TDCS系统。使用GNU Radio软件平台,设计、编写实现认知组网协议所需的模块和程序,在USRP上搭建了多用户认知通信平台,并进行了通信实验验证。实验结果表明,该系统在干扰环境下,相较于传统OFDM通信系统具有更好的通信稳定性,通信成功率维持在80%以上,且能够根据信道条件主动切换通信策略,实现了多用户认知通信组网协议。更多还原

【Abstract】 The cognitive transformation domain communication system(TDCS)has been ap-plied in the field of communication anti-interference in electronic warfare due to its ability to identify the spectrum range of interference signals and determine idle spectrum.How-ever,current applications are mainly focused on point-to-point communication,and there are limitations in low transmission rates.In response to these issues,this paper conducts research and design of a TDCS multi-user networking protocol based on TDMA protocol.The main innovative work of this paper is as follows:1.Designed a spectrum sensing result exchange mechanism suitable for TDCS sys-tems.Through the analysis of the limitations of TDCS systems,it is shown that traditional TDCS systems have problems such as low spectral efficiency and spectrum mismatch be-tween the transmitting and receiving ends.This article addresses the issue of poor de-modulation performance in TDCS systems when there is spectrum mismatch between the transmitting and receiving ends.The structure of the physical layer frame header has been improved by adding a domain to represent the spectrum sensing results,achieving the purpose of exchanging spectrum sensing results and synchronizing spectrum sensing information between the transmitting and receiving ends.2.Designed a multi-user cognitive communication networking protocol based on TDMA mechanism.Combining TDCS system with IEEE802.11 communication system using PSK and QAM modulation methods,users in the network achieve frame synchro-nization through beacon frames and respond based on spectrum sensing results and current communication success rate,such as switching modulation methods and sub channels;At the same time,a comprehensive application layer with data packet division function and retransmission mechanism was designed to enable users in the network to exchange short messages or files,achieving dynamic and flexible networking communication among mul-tiple users in complex environments.3.Built a semi physical TDCS system based on USRP.Using the GNU Radio soft-ware platform,design and write the modules and programs required to implement the TDMA networking protocol,build a multi-user cognitive communication platform on USRP,and conduct communication experiments for verification.The experimental re-sults show that the system has better communication stability compared to traditional OFDM communication systems in interference environments,with a packet loss rate of no more than 10%,a communication success rate of 80%,and the ability to actively switch communication strategies based on channel conditions,achieving a multi-user cognitive communication network protocol.更多还原