What technologies offer methods for increasing theoretical bandwidth and effective data throughput when the same maximum frequency is used?

What technologies offer methods for increasing theoretical bandwidth and effective data throughput when the same maximum frequency is used?

• A. Modulation
• B. Both modulation and encoding
• C. Encoding
• D. None

Answer: (B)

When the channel bandwidth is fixed, increasing throughput comes from boosting spectral efficiency—how many bits you can carry per hertz. Modulation does this by packing more bits into each symbol, so higher‑order schemes (like moving from QPSK to 16‑QAM or 64‑QAM) send more data without widening the channel. Encoding helps too: error‑correcting codes protect data so the system can operate reliably at a higher data rate and with less retransmission, and data compression (a form of encoding) reduces the number of bits that must be sent. Taken together, modulation and encoding raise the amount of useful data that can go through the same bandwidth, making them the technologies that boost theoretical bandwidth and actual throughput within the same maximum frequency.

When the channel bandwidth is fixed, increasing throughput comes from boosting spectral efficiency—how many bits you can carry per hertz. Modulation does this by packing more bits into each symbol, so higher‑order schemes (like moving from QPSK to 16‑QAM or 64‑QAM) send more data without widening the channel. Encoding helps too: error‑correcting codes protect data so the system can operate reliably at a higher data rate and with less retransmission, and data compression (a form of encoding) reduces the number of bits that must be sent. Taken together, modulation and encoding raise the amount of useful data that can go through the same bandwidth, making them the technologies that boost theoretical bandwidth and actual throughput within the same maximum frequency.