Which data transmission method is known to be susceptible to EMI and is seen in the older Wireless b standard?

Which data transmission method is known to be susceptible to EMI and is seen in the older Wireless b standard?

• A. Direct Sequence Spread Spectrum (DSSS)
• B. Orthogonal Frequency Division Multiplexing (OFDM)
• C. Wireless channels
• D. Wi-Fi Analyzer

Answer: (A)

Direct Sequence Spread Spectrum (DSSS) is the correct choice because it is a modulation technique that spreads the data signal over a wider bandwidth than the data signal itself, which makes it susceptible to electromagnetic interference (EMI). DSSS was primarily used in the older IEEE 802.11b wireless standard for wireless networking. This method works by taking the original data signal and combining it with a pseudo-random noise sequence, which helps in reducing the effects of interference, but it still remains vulnerable to strong sources of EMI compared to more advanced standards. This vulnerability is particularly significant in environments with high levels of electromagnetic noise, such as industrial settings or areas with a lot of electronic equipment. In contrast, other options like Orthogonal Frequency Division Multiplexing (OFDM) were developed later and are used in newer standards such as 802.11g and 802.11n. OFDM is less susceptible to EMI because it breaks the signal into multiple smaller sub-signals that are transmitted simultaneously at different frequencies, thereby better coping with interference. Wireless channels refers to the pathways through which wireless signals travel, but it does not specifically indicate a suitability or susceptibility to EMI. A Wi-Fi Analyzer is a tool for measuring and analyzing Wi-Fi signals but does

Direct Sequence Spread Spectrum (DSSS) is the correct choice because it is a modulation technique that spreads the data signal over a wider bandwidth than the data signal itself, which makes it susceptible to electromagnetic interference (EMI). DSSS was primarily used in the older IEEE 802.11b wireless standard for wireless networking.

This method works by taking the original data signal and combining it with a pseudo-random noise sequence, which helps in reducing the effects of interference, but it still remains vulnerable to strong sources of EMI compared to more advanced standards. This vulnerability is particularly significant in environments with high levels of electromagnetic noise, such as industrial settings or areas with a lot of electronic equipment.

In contrast, other options like Orthogonal Frequency Division Multiplexing (OFDM) were developed later and are used in newer standards such as 802.11g and 802.11n. OFDM is less susceptible to EMI because it breaks the signal into multiple smaller sub-signals that are transmitted simultaneously at different frequencies, thereby better coping with interference.

Wireless channels refers to the pathways through which wireless signals travel, but it does not specifically indicate a suitability or susceptibility to EMI. A Wi-Fi Analyzer is a tool for measuring and analyzing Wi-Fi signals but does