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Suresh, Kasyap, Varun Jeoti, Micheal Drieberg, Socheatra Soeung, AsifIqbal, Goran M. Stojanović, and Sohail Sarang. “Simultaneous Detection of Multiple Surface Acoustic Wave Sensor-Tagsfor Water Quality Monitoring utilizing Cellular Code - Reuse Approach. “IEEE Internet of Things Journal (2021). 10.1109/JIOT.2021.3082141 PROPOSED FRAMEWORK: CELL CLUSTER: CELLULAR CODE-REUSE FRAMEWORK: A cell cluster M = 4 consisting of a single reader and 32 orthogonal SAW sensor-tags per hexagonal cell. Total number of orthogonal codes for entire cluster = 32(n) x 4(M) = 128(C). R1 R2 R4 R3 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 Centralized Monitoring Centre Centralized Cloud Server Wireless communication link (LoRaWan, Sigfox, INGENU) R1 RFID Reader 16 Orthogonal SAW Sensor - Tags Wireless communication link R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 RFID Reader 16 Orthogonal SAW Sensor - Tags D Reuse 4 3.5 3 2.5 2 1.5 1 0.5 100 200 300 400 500 600 700 800 900 1000 2-bit Time Slot UWB SAW RFID Tag Time (in ns) Frequency (in GHz) SAW Tag-1 SAW Tag-2 SAW Tag-3 SAW Tag-4 0 S 11 Time Domain Response Time (in µs) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 0 -20 -40 -60 -80 -100 SAW Tag-1 SAW Tag-2 Amplitude (in dB) Reflection Loss from a Single Reflector Frequency (in MHz) 2000 -20 -30 -40 -60 -70 Amplitude (in dB) -50 2100 2200 2300 2400 2500 2600 2700 S 11 (f 2 ) = 22dB (approx.) Read Range Performance Analysis Read Transmit Power (in W) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 0 -20 -40 -60 -80 -100 Read Range (in m) SNR = 12 dB, Open Circut (OC) Design SNR = 17 dB, Open Circut (OC) Design SNR = 12 dB, Inductive Resonant Loading (IRL) Design SNR = 17 dB, Inductive Resonant Loading (IRL) Design Large Pond Simultaneous Detection Of Multiple Surface Acoustic Wave Sensor-Tags For Water Quality Monitoring Utilizing Cellular Code-Reuse Approach
