[4] [4] MO S H,BAE J H,PARK C W,et al. Modeling and simulation of new encoding schemes for high-speed UHF RFID communication[J]. Etri Journal, 2015,37(2):241-250.

[5] [5] HE C,WANG Z J,LEUNG V C M. Unitary query for the M×L×N MIMO backscatter RFID channel[J]. IEEE Transactions on Wireless Communications, 2015,14(5):2613-2625.

[7] [7] JOMEHEI M G,SHEIKHAEI S. An ultra low-voltage low power PSK backscatter modulator for passive UHF RFID tags compatible with C1 G2 EPC standard protocol[J]. Analog Integrated Circuits & Signal Processing, 2014,78(2):489-499.

[8] [8] FASARAKIS-HILLIARD N,ALEVIZOS P N,BLETSAS A. Coherent detection and channel coding for bistatic scatter radio sensor networking[J]. IEEE Transactions on Communications,2015,63(5):1798-1810.

[9] [9] PSOMAS C,KRIKIDIS I. Backscatter communications for wireless powered sensor networks with collision resolution[J]. IEEE Wireless Communications Letters, 2017,6(5):650-653.

[11] [11] ALHASSOUN M,VARNER M A,DURGIN G D. Theory and design of a retrodirective rat-race-based RFID tag[J]. IEEE Journal of Radio Frequency Identification, 2019,3(1):25-34.

[13] [13] DASKALAKIS S N,KIMIONIS J,COLLADO A,et al. Ambient backscatterers using FM broadcasting for low cost and low power wireless applications[J]. IEEE Transactions on Microwave Theory & Techniques, 2017,65(12):5251-5262.

[14] [14] ANSARI I S,ALOUINI M S. On the performance analysis of digital communications over Weibull-gamma channels[C]// Proceedings of 2015 IEEE 81st Vehicular Technology Conference. Glasgow,UK:IEEE, 2015:1-7.