📡 Introduction to MIMO

Multiple-Input Multiple-Output Systems Quiz

Communication Engineering | Undergraduate Level

1
What does MIMO stand for in wireless communication systems?
A Multiple-Input Multiple-Output
B Multi-Interface Modulation Operation
C Modulated Input Multiplier Output
D Matrix-Integrated Modulation Oscillator
2
Which of the following is NOT one of the three basic techniques used in MIMO communication?
A Spatial Diversity
B Spatial Multiplexing
C Frequency Hopping
D Beamforming
3
In spatial multiplexing, how does the channel capacity scale with the number of antennas?
A Logarithmically with the number of antennas
B Linearly with the minimum of transmit or receive antennas
C Exponentially with the number of antennas
D Remains constant regardless of antenna count
4
What is the primary advantage of spatial diversity in MIMO systems?
A Increases data rate by transmitting multiple independent streams
B Improves reliability and reduces fading through redundant transmission
C Reduces the required transmission power by 50%
D Eliminates multipath propagation completely
5
In a 4×4 MIMO system, what is the maximum number of independent spatial streams that can be transmitted simultaneously?
A 2 streams
B 4 streams
C 8 streams
D 16 streams
6
What mathematical technique is commonly used to decompose the MIMO channel into independent spatial streams?
A Fourier Transform
B Singular Value Decomposition (SVD)
C Laplace Transform
D Z-Transform
7
What is the Alamouti scheme primarily used for in MIMO systems?
A Spatial multiplexing to increase data rates
B Transmit diversity using space-time coding
C Channel estimation and equalization
D Power allocation across antennas
8
In the context of MIMO, what does "rich scattering environment" refer to?
A High transmit power environment
B Environment with multiple reflectors creating independent channel paths
C Environment with minimal interference
D Line-of-sight communication only
9
What is the fundamental trade-off in MIMO systems between diversity and multiplexing?
A Higher diversity reduces reliability while multiplexing increases it
B Using degrees of freedom for diversity reduces those available for multiplexing and vice versa
C There is no trade-off; both can be maximized simultaneously
D Diversity increases data rate while multiplexing improves reliability
10
For a MIMO system with n transmit and n receive antennas in a rich scattering environment, how does the ergodic channel capacity scale approximately?
A C ≈ n × log₂(1 + SNR)
B C ≈ log₂(1 + n × SNR)
C C ≈ n² × log₂(1 + SNR)
D C ≈ log₂(n + SNR)
11
What is the primary objective of beamforming in MIMO systems?
A To increase the number of spatial streams
B To focus signal energy in specific directions to increase SINR
C To eliminate the need for channel state information
D To reduce the number of required antennas
12
In Multi-User MIMO (MU-MIMO), what is the key advantage over Single-User MIMO (SU-MIMO)?
A MU-MIMO requires fewer antennas at the base station
B MU-MIMO can serve multiple users simultaneously on the same time-frequency resources
C MU-MIMO eliminates interference completely
D MU-MIMO does not require channel state information