Which description best characterizes FHSS operation?

Which description best characterizes FHSS operation?

• A. Hops across frequencies within the band
• B. Spreads data with chips across all frequencies
• C. Operates on a single fixed frequency
• D. Uses multipath diversity

Answer: (A)

The key idea here is how frequency-hopping spread spectrum works: the transmitter and receiver switch the carrier among different frequencies within the band in a pseudo-random sequence. By hopping from one channel to another in rapid succession, the signal tends to avoid interference on any single frequency and makes interception harder. That’s exactly what the description that hops across frequencies captures. Spreading data with chips across all frequencies describes direct-sequence spread spectrum, not FHSS. Operating on a single fixed frequency describes a narrowband, not hopping, scheme. Using multipath diversity is about using multiple reception paths to improve reliability, not about changing frequencies.

The key idea here is how frequency-hopping spread spectrum works: the transmitter and receiver switch the carrier among different frequencies within the band in a pseudo-random sequence. By hopping from one channel to another in rapid succession, the signal tends to avoid interference on any single frequency and makes interception harder. That’s exactly what the description that hops across frequencies captures.

Spreading data with chips across all frequencies describes direct-sequence spread spectrum, not FHSS. Operating on a single fixed frequency describes a narrowband, not hopping, scheme. Using multipath diversity is about using multiple reception paths to improve reliability, not about changing frequencies.