Which technology is central to 802.11ac performance improvements?

Which technology is central to 802.11ac performance improvements?

• A. Token Ring access method
• B. Frequency hopping spread spectrum
• C. Analog modulation
• D. MIMO (Multiple-Input, Multiple-Output)

Answer: (D)

MIMO, or Multiple-Input, Multiple-Output, is what drives the performance gains in 802.11ac. By using several antennas at the transmitter and receiver, the system can send and receive multiple independent data streams at the same time. This spatial multiplexing increases throughput and improves reliability in multipath environments, which are common in real-world rooms and buildings. 802.11ac builds on this by supporting more spatial streams and wider channels, delivering much higher speeds than earlier Wi‑Fi generations. The other options are not part of 802.11ac: Token Ring is a legacy wired access method, frequency hopping spread spectrum is an older technique not used in modern Wi‑Fi, and analog modulation has been replaced by digital modulation in Wi‑Fi standards.

MIMO, or Multiple-Input, Multiple-Output, is what drives the performance gains in 802.11ac. By using several antennas at the transmitter and receiver, the system can send and receive multiple independent data streams at the same time. This spatial multiplexing increases throughput and improves reliability in multipath environments, which are common in real-world rooms and buildings. 802.11ac builds on this by supporting more spatial streams and wider channels, delivering much higher speeds than earlier Wi‑Fi generations. The other options are not part of 802.11ac: Token Ring is a legacy wired access method, frequency hopping spread spectrum is an older technique not used in modern Wi‑Fi, and analog modulation has been replaced by digital modulation in Wi‑Fi standards.