Passive Backscatter Communication Scheme for OFDM-IM with Dynamic Carrier Activation

被引:0
|
作者
Li, Shibao [1 ]
Lu, Rui [1 ]
机构
[1] China Univ Petr East China, Coll Oceanog & Space Informat, Qingdao 266580, Peoples R China
基金
中国国家自然科学基金;
关键词
backscatter communication; OFDM; index modulation; bit error rate; MODULATION;
D O I
10.3390/s23083841
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Multicarrier backscattering has been proposed to improve the communication rate, but the complex circuit structure of multicarrier backscattering devices requires more power consumption, resulting in devices far away from the radio frequency (RF) source without enough power to maintain communication, which greatly reduces the limited communication range in backscattering. To solve this problem, this paper introduces carrier index modulation (IM) into orthogonal frequency division multiplexing (OFDM) backscattering and proposes a dynamic subcarrier activated OFDM-IM uplink communication scheme suitable for passive backscattering devices. When the existing power collection level of the backscatter device is detected, only a subset of carrier modulation is activated using part of the circuit modules to reduce the power threshold required for device activation. The activated subcarriers are mapped by a block-wise combined index using the look-up table method, which can not only transmit information using traditional constellation modulation but also carry additional information through the frequency domain carrier index. Monte Carlo experiments show that this scheme can effectively increase the communication distance and improve the spectral efficiency of low-order modulation backscattering when the power of the transmitting source is limited.
引用
收藏
页数:12
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