How does OFDMA differ from OFDM?
Answer(s): C
OFDM vs. OFDMA:OFDM (Orthogonal Frequency-Division Multiplexing): Divides a channel into multiple subcarriers for data transmission.OFDMA (Orthogonal Frequency-Division Multiple Access): Extends OFDM by allowing multiple users to share subcarriers simultaneously, improving efficiency and spectral utilization.
OFDM: https://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiplexing OFDMA: https://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiple_access
What metric is used to express a relative increase or decrease in signal strength?
Decibel (dB): A logarithmic unit expressing ratios of power or signal strength. It's used in RF contexts due to the wide range of signal levels encountered.Examples:dBm: Decibels relative to one milliwatt (power measurement). dBi: Decibels relative to an isotropic antenna (antenna gain).
Decibel: https://en.wikipedia.org/wiki/Decibel
As an RF signal propagates it becomes weaker at any given measurement point as it gets farther away from the transmitter. What concept is described?
Answer(s): B
Free Space Path Loss (FSPL): Describes how a radio signal weakens as it travels through open space, even without obstacles. It's caused by the signal spreading out, resulting in decreased power density at the receiver.Calculation: FSPL depends on distance and frequency.
Free Space Path Loss: https://en.wikipedia.org/wiki/Free-space_path_loss
You are implementing a smart office wireless solution for a small business. The business owner indicates that It is acceptable to use consumer-targeted wireless devices. What is a common negative attribute of consumer-targeted smart home or smart office devices?
Consumer Smart Devices Limitation: Many consumer-oriented smart devices are designed for simplicity and cost-effectiveness, leading to reliance on the crowded 2.4 GHz band.Consequences:High Interference: Increased potential for interference from Wi-Fi and other 2.4 GHz devices. Limited scalability: Performance and reliability may degrade in busy wireless environments.
What is most often used to track livestock on large farms and identify each animal Individually?
RFID for Livestock: Radio Frequency Identification (RFID) tags are the most widely used technology for livestock tracking and individual identification on large farms.Benefits:Unique ID: Each RFID tag has a unique code.Data Storage: Some tags store information about the animal.Durability: Tags withstand outdoor conditions.Automated Reading: Tags can be scanned quickly.
RFID (General): https://en.wikipedia.org/wiki/Radio-frequency_identification
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