Spatial Modulation-Based Ambient Backscatter: Bringing Energy Self-Sustainability to Massive Internet of Everything in 6G  

作　　者：Zhiang Niu Wenyuan Ma Wei Wang Tao Jiang 

机构地区：[1]Wuhan National Laboratory for Optoelectronics and School of Electronic Information and Communications,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《China Communications》2020年第12期52-65,共14页中国通信（英文版）

基　　金：This work was supported in part by the National Key R&D Program of China with Grant number 2019YFB1803400;Young Elite Scientists Sponsorship Program by CAST under Grant number 2018QNRC001;National Science Foundation of China with Grant number 91738202,62071194.

摘　　要：Ambient backscatter communications(AmBC)is a new ultra-low-power communication paradigm,which holds great promise for enabling energy self-sustainability(ESS)to massive data-intensive Internet of Everything(IoE)devices in 6G.Recent advances improve throughput and reliability by adopting multiple-antenna techniques in conventional backscatter communications(CoBC),but they cannot be directly applied to AmBC devices for high spectral and energy efficiency due to the unknown RF source and minimalist design in backscatter tag.To fill this gap,we propose SM-backscatter,an AmBC-compatible system that greatly improves spectral efficiency while maintaining ultra-low-power consumption.Specifically,the SM-backscatter consists of two novel components:i)a multiple-antenna backscatter tag that adopts spatial modulation(SM),and ii)a joint detection algorithm that detects both backscatter and source signals.To this end,we theoretically obtain an optimal detector and propose two suboptimal detectors with low complexity.Subsequently,we derive the BERs of both the backscatter and source signals to analyze the communication performance by introducing a two-step algorithm.Our simulation results verify the correctness of the theoretical analysis and indicate that our system can significantly outperform existing solutions.

关 键 词：ambient backscatter communications spatial modulation joint detector union bounding technique 

分 类 号：TN926[电子电信—通信与信息系统] TP391.44[电子电信—信息与通信工程] TN929.5[自动化与计算机技术—计算机应用技术]