COMP4336/9336 Mobile data networking W4 Quiz: 802.11af/ah/ad/ay A mobile device is equipped with an 802.11af WiFi chip that follows the US standard of 6MHz channels. The device is also equipped with two antennas to support its WiFi communications. What is the maximum data rate that this device can enjoy for its WiFi without using any […]
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COMP4336/9336 Mobile data networking W8 Quiz: IoT and LoRa 1. Which of the following layer in LoRa protocol stack is based on proprietary technology? c) Network d) Application 2. Duty cycle limit is imposed for LoRa end devices to a) Save the energy cost of network servers b) Save the energy cost of application servers
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COMP4336/9336 Mobile data networking W5 Quiz: Bluetooth Q1. Bluetooth can interfere with A1. Bluetooth operates within 2.4 GHz band and hence can interfere with any WiFi that also operates within 2.4GHz band. 802.11ax can operate at either 2.4 GHz or 5GHz band, so BT can interfere with 11ax. Q2. If 4-slot packets were allowed in
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COMP4336/9336 Mobile data networking W9 Quiz: RF Sensing 1. What is the resolution of an FMCW radar utilising the frequency band 77GHz- 81GHz? c) 30cm d) 60cm e) 90cm 2. What is the resolution of pulse radar operating with 100ns pulses? a) 5m d) 20m e) 100m 3. A 60GHz radar is likely to a)
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Wireless LAN I IEEE 802.11 Basics ©2020 Mahbub Hassan 1. IEEE 802.11 vs. WiFi 2. IEEE Standards Numbering System 3. Key features of 802.11 4. 802.11 Bands and Channels 5. Hidden Node Problem and 4-Way Handshake RTS/CTS) 6. 802.11 MAC (inter-frame space, PCF, DCF) 7. 802.11 Architecture and Addressing 8. 802.11 Frame Format 9. 802.11
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COMP4336/9336 Mobile data networking W7 Quiz: Cellular Networks Q1. Using a cluster size of 3, a cellular operator can reuse its spectrum every 6 km if each cell has 2 km radius. a) TRUE b) FALSE Cluster size of 3 means N=3. D=R x sqrt{3N} = 2km x sqrt{3×3} = 6 km A cellular operator
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b) c) d) e) COMP4336/9336 Mobile data networking W3 Quiz: WiFi Basics + Mainstream WiFi Which of the following protocol mechanism helps address the hidden node problem in Carrier Sensing Virtual Carrier Sensing Although a total of fourteen 22-MHz channels is defined for 2.4 GHz DSSS WLANs, the 14th channel is not always available. The
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IEEE 802.11 Evolution ©2020 Mahbub Hassan 1. Chronology of IEEE 802.11 Amendments 2. Maths of WiFi Data Rates | Modulation and Coding Scheme 3. 802.11a/b/g 4. 802.11n: Channel Bonding, Aggregation 5. 802.11ac: Multi-User MIMO 6. 802.11ax: OFDMA ©2020 Mahbub Hassan q 802.11-1997: 2 Mbps Legacy WiFi in 2.4GHz (now extinct!) q 802.11b-1999: Higher speed modulation
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COMP4336/9336 Mobile data networking W10 Quiz: All contents 1. An FMCW radar has a range resolution of 150mm. Which of the following statements cannot be true? The radar chirps sweep from 24GHz-25GHz b. The radar chirps sweep from 79GHz-80GHz c. The radar chirps sweep from 77GHz-78GHz d. The radar chirps sweep from 79GHz-81GHz e. The
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c) 15 d) -20 e) -10 COMP4336/9336 Mobile data networking W1 Quiz on PHY Fundamentals I A telephone line is known to have a loss of 15 dB. The input signal power is measured at 1 Watt, and the output signal noise level is measured at 1 dBm. What is the signal to noise ratio
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