IOT 2

Interference and multipath fading occur with IEEE 802.15.4

because

• It is having unbounded latency

• it lacks a frequency-hopping technique

• It is low cost and low data rate device

• None of the above

Protocol Stacks Utilizing IEEE 802.15.4

• ZigBee

• ZigBee IP

• Both 1 and 2

• None of the above

DSSS is a modulation technique in which a signal is

intentionally spread in the______ domain, resulting in

greater bandwidth.

Answer explanation

The original IEEE 802.15.4-2003 standard specified only

three PHY options based on direct sequence spread spectrum

(DSSS) modulation

The modulating signal is nothing but the baseband signal or

information signal while the carrier is a high frequency

sinusoidal signal. When you modulate amplitude of the carries signal to embed information signal you call that technique as

• Amplitude shift keying

• Amplitude modulation shifting

• APSK

• None of the above

The minimum antenna height required to transmit a

baseband signal of f = 5 kHz is:

• 15000 meters

• 16000 meters

• 15500 meters

• 16600 meters

The maximum size of the IEEE 802.15.4 PSDU is

• 127 bytes

• 128 bytes

• 128 bits

• 1280 bytes

Using the Security Enabled field in the Frame Control

portion of the 802.15.4 header is the first step to enabling

Security.

• True

• False

IEEE 802.15.4g and 802.15.4e's Standardization and Alliances

Are

• Wi-fi

• Wi-max

• Wi-sun

• All of the above

Deployments of IEEE 802.15.4g-2012 are mostly based on a

• Mesh topology

• Star topology

• Bus topology

• All of the above

LoRa modulation is based on

• chirp sequence spread spectrum

• Direct sequence spread spectrum

• parallel sequence spread spectrum

• None of the above