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Wireless Sensor Networks M Homework #1

Wireless Sensor Networks M Homework #1. Part 1. Consider two sensor devices (one transmitter and one receiver) IEEE 802.15.4 standard-compliant. Assume that the Loss in dB between the two nodes at distance d, is given by: L[dB ]=k 0 +k 1 ln (d )

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Wireless Sensor Networks M Homework #1

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  1. Wireless SensorNetworks MHomework #1

  2. Part 1 Consider two sensor devices (one transmitter and one receiver) IEEE 802.15.4 standard-compliant. Assume that the Loss in dB between the two nodes at distance d, is given by: L[dB]=k0+k1ln(d) Where k0=40 dB, k1=17.37 and ln is the natural logarithm. By setting the bilateral power spectral density of the receiver, N0=7*10-20W/Hz and the transmit power, Pt= 0 dBm, which is the maximum distance between the two devices, such that the Block Error Rate, BLER is lower than 10-2, when a data block composed of 10 Bytes is transmitted?

  3. Part 2 Two IEEE 802.15.4 sensor nodes are d meters apart at a height of 2 m above the ground. The transmitting node takes a sample every 16 ms, encodes it with four bytes and transmits it through a data burst composed of 30 bytes overall. The link uses channel 25 of IEEE 802.15.4. with transmission power set at 0.1 mW. The bilateral power spectral density of the receiver, N0=8*10-18W/Hz The energy consumed by the transmitting node to send the data is 50 mJ. The initial battery charge is 20 000 J. The energy consumed by the receiving node to receive the data is 60 mJ. Its initial battery charge is 10 000 J. 1) Assuming d = 40 m, compute the BLER 2) Compute the linklifetime

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