Which technology uses multiple antennas at the transmitter and receiver to improve data rate and link reliability?

Which technology uses multiple antennas at the transmitter and receiver to improve data rate and link reliability?

• A. DSSS
• B. MIMO-OFDM
• C. FHSS
• D. WLAN

Answer: (B)

Using multiple antennas at both the transmitter and receiver creates several independent spatial paths for the signal. This setup, known as MIMO, lets you send multiple data streams at once to boost data rate (spatial multiplexing) and also exploits diverse paths to improve reliability in fading environments (diversity). When you add OFDM, the wide channel is broken into many narrow subcarriers, which helps tackle multipath effects and makes it easier to maintain high data rates with robust performance. The combination of these ideas—MIMO with OFDM—is what you’re seeing in modern high-speed wireless systems, often referred to as MIMO-OFDM. This is why it best fits the description of a technology that uses multiple antennas at both ends to improve data rate and link reliability. Direct Sequence Spread Spectrum and Frequency Hopping Spread Spectrum are spread-spectrum techniques that enhance resilience and spectrum sharing but do not inherently rely on multiple antennas to increase throughput or reliability. WLAN is a general category of wireless networks rather than a specific technology that describes this antenna arrangement.

Using multiple antennas at both the transmitter and receiver creates several independent spatial paths for the signal. This setup, known as MIMO, lets you send multiple data streams at once to boost data rate (spatial multiplexing) and also exploits diverse paths to improve reliability in fading environments (diversity).

When you add OFDM, the wide channel is broken into many narrow subcarriers, which helps tackle multipath effects and makes it easier to maintain high data rates with robust performance. The combination of these ideas—MIMO with OFDM—is what you’re seeing in modern high-speed wireless systems, often referred to as MIMO-OFDM. This is why it best fits the description of a technology that uses multiple antennas at both ends to improve data rate and link reliability.

Direct Sequence Spread Spectrum and Frequency Hopping Spread Spectrum are spread-spectrum techniques that enhance resilience and spectrum sharing but do not inherently rely on multiple antennas to increase throughput or reliability. WLAN is a general category of wireless networks rather than a specific technology that describes this antenna arrangement.