摘要
针对传统物联网(IoT)能耗大、频谱资源稀缺的问题,提出了由环境反向散射、协作接收机(CRx)和环境射频(RF)源共同构建的协作多输入多输出环境反向散射通信(MIMO-AmBC)系统模型。首先,通过使用PSR方案对该系统模型进行分析,推导出信噪比(SNR);其次,推导出主链路和反向散射链路的遍历速率近似表达式,并得到反向散射链路遍历速率最大值表达式;最后,将其与传统蜂窝网络、CSR方案作对比。实验结果验证了理论推导的正确性并给出有意义结论:1)反向散射链路速率随接收天线数对数增长,与发射天线数无关。2)在SNR为10 dB时,PSR方案的和速率比传统方案、CSR方案分别提升36.8%和29.9%,虽然PSR方案的主链路速率比CSR方案降低5.5%,但反向散射链路的遍历速率比CSR方案提升7.7倍。为实际应用选取AmBC共生方案提供了理论参考。
To solve the problems of large energy consumption and scarcity of spectrum resources in the traditional Internet of Things(IoT),a Multiple Input Multiple Output-Ambient Backscatter Communication(MIMO-AmBC)system model which is constructed by an ambient backscatter,a Cooperative Receiver(CRx)and ambient Radio Frequency(RF)source was proposed.First,the system model was analyzed by using the Parasitic Symbiotic Radio(PSR)scheme to derive the Signal-to-Noise Ratio(SNR).Secondly,the approximate expressions for the ergodic rates of the primary link and the backscatter link were derived,and the maximum expression for the ergodic rate of the backscatter link was obtained.Finally,the proposed system model was compared with the traditional cellular network and Commensal Symbiotic Radio(CSR)scheme.The experimental results verify the correctness of the theoretical derivation and give some meaningful conclusions:1)the backscatter link rate increases with the logarithm of the number of receiving antennas and has nothing to do with the number of transmitting antennas;2)when the SNR is 10 dB,the sum rate of the PSR scheme is higher than those of the traditional scheme and the CSR scheme by 36.8% and 29.9% respectively.Although the primary link rate of the PSR scheme is 5.5% lower than that of the CSR scheme,the ergodic rate of the backscatter link is 7.7 times higher than that of the CSR scheme,which provides theoretical reference for choosing the AmBC symbiosis scheme for practical applications.
作者
郑鑫
李素月
王安红
李美玲
Sami MUHAIDAT
宁爱平
ZHENG Xin;LI Suyue;WANG Anhong;LI Meiling;Sami MUHAIDAT;NING Aiping(School of Electronic and Information Engineering,Taiyuan University of Science and Technology,Taiyuan Shanxi 030024,China;Department of Electrical Engineering and Computer Science,Khalifa University,Abu Dhabi 999041,United Arab Emirates)
出处
《计算机应用》
CSCD
北大核心
2022年第3期974-979,共6页
journal of Computer Applications
基金
国家自然科学基金资助项目(62072325)。
关键词
物联网
协作接收机
多输入多输出
环境反向散射
遍历速率
Internet of Things(IoT)
Cooperative Receiver(CRx)
Multiple Input Multiple Output(MIMO)
ambient backscatter
ergodic rate
