Advantages of Sensornet Energy advantage Short-range communication Send(Nr) Send(r) ■■■ P receive Nr Trade-off: of hops 2021/2/2
2021/2/2 11 Advantages of Sensornet ◼ Energy advantage ◼ Short-range communication ◼ Trade-off: # of hops … Preceive Psend(r) Psend(Nr) r Nr
Advantages of Sensor Net Detection advantage More sensors shorter distance to the target Better signal-to-noise ratio( SNR) SNR=10o% Pnoise receive 10 log Source log Pnoise-20 logr nsmr= SR SNR=20 -=10log k 2021/2/2 12
2021/2/2 12 Advantages of Sensor Net ◼ Detection advantage ◼ More sensors, shorter distance to the target ◼ Better signal-to-noise ratio (SNR) P P r P SNR noise noise 10log 10log 20log P 10log source receive r = = − − k k r r SNR SNRr k r snr = − = 20log =10log
Advantages of Sensor Net Structure advantage Robustness due to redundancy In-network processing 2021/2/2 13
2021/2/2 13 Advantages of Sensor Net ◼ Structure advantage ◼ Robustness due to redundancy ◼ In-network processing
Disadvantage Small sensors a Limited onh Power Communication range bandwidth Computation power Memory 2021/2/2 14
2021/2/2 14 Disadvantage ◼ Small sensors ◼ Limited on: ◼ Power ◼ Communication range & bandwidth ◼ Computation power ◼ Memory
Power Short-range communication a On-demand sensory Short duty cycle More computing, less communication a Field charging 2021/2/2 15
2021/2/2 15 Power ◼ Short-range communication ◼ On-demand sensory ◼ Short duty cycle ◼ More computing, less communication ◼ Field charging