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Table 1 List of abbreviations

From: Efficient energy resource utilization in a wireless sensor system for monitoring water quality

ADC Analog-to-digital converter mc, a; gc, b Class A channel power gain for UL channels; class B channel power gain for UL channels
BS / c1 Base station nc, a; uc, b Class A channel power gain for DL channels; class B channel power gain for DL channels
CSI Channel state information Γ SNR gap
DL Downlink σ 2 Noise power
EH Energy harvesting jc; ξ0 Time-length of class A energy harvesting; time-length of class B energy harvesting
IPS Intended RF power sources ζa; ξb Time-length of class A information transmission; time-length of class B information transmission
IoT Internet-of-Things xc, a; xc, b Power signal received by senor a; Power signal received by senor b
ISM Industrial, scientific and medical za; zb Background noise at sensor a; Background noise at sensor b
MCMIS Multi-class, multiple-intended-source Ea; Eb Total energy received by sensor a; total energy received by sensor b
OAERA Optimization algorithm for efficient resource allocation jc; ξ0 Time-length of class A energy harvesting; time-length of class B energy harvesting
QoS Quality-of-service ζa; ξb Time-length of class A information transmission; time-length of class B information transmission
RF Radio frequency za; zb Background noise at sensor a; Background noise at sensor b
TDMA Time division multiple access Ea; Eb Total energy received by sensor a; total energy received by sensor b
UL Uplink εa; εb RF-to-DC conversion efficiency
WIPT Wireless energy transmission and wireless information transmission Pa; Pb Average energy consumed by sensor a for data transmission; average energy consumed by sensor b for data transmission
WSNs Wireless sensor network Ψa; Ψb Fixed allowable portion of energy for sensor a data transmission; fixed allowable portion of energy for sensor b data transmission
WPSN Wireless powered sensor network \( {x}_{c_1,a} \);\( {x}_{c_1,b} \) Signal received by the BS from sensor a; signal received by the BS from sensor b
a {a1, a2, .., A}; b {b1, b2, .., B} Set of sensor nodes in class A; set of sensor nodes in class B xa; xb Sensor a arbitrary random signal; sensor b arbitrary random signal
c {c1, c2, .., C} Set of intended RF power sources εa; εb RF-to-DC conversion efficiency
\( {\overset{\sim }{m}}_{c,a} \); \( {\overset{\sim }{g}}_{c,b} \) Complex variable of class A UL channels from sensor a to the BS; complex variable of class B UL channels from sensor b to the BS Pa; Pb Average energy consumed by sensor a for data transmission; average energy consumed by sensor b for data transmission
\( {\overset{\sim }{n}}_{c,a} \); \( {\overset{\sim }{u}}_{c,b} \) Complex variable of class A DL channels from an IPS c to sensors a; complex variable of class B DL channels from an IPS c to sensors b Ψa; Ψb Fixed allowable portion of energy for sensor a data transmission; fixed allowable portion of energy for sensor b data transmission
xc, a; xc, b Power signal received by senor a; power signal received by senor b E.coli Escherichia coli
pH Potential of hydrogen (in logarithmic scale standard)