Wireless & Mobile Communications Mcqs

Q:

_______ is an additional open-loop MIMO technique considered by the WiMAX vendors.

A) STTD B) SM
C) Collaborative Uplink MIMO D) MU-MIMO
 
Answer & Explanation Answer: C) Collaborative Uplink MIMO

Explanation: Collaborative MIMO is an open-loop MIMO technique considered by the WiMAX vendors to surge the spectral efficiency and capacity of the uplink communications path. It is compared with the regular spatial multiplexing, wherein data streams are transmitted multiplying from multiple antennas on the same device.

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16
Q:

_______ is a transmission method used in MIMO wireless communications to transmit encoded data signals independently.

A) STTD B) SM
C) Collaborative Uplink MIMO D) MU-MIMO
 
Answer & Explanation Answer: B) SM

Explanation: Spatial multiplexing is a transmission method used in MIMO wireless communications to transmit encoded data signals independently and separately (so-called streams) from each of the multiple transmit antennas.

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8
Q:

_______ is a technique of transmit diversity used in UMTSS third-generation cellular systems.

A) STTD B) SM
C) Collaborative Uplink MIMO D) MU-MIMO
 
Answer & Explanation Answer: A) STTD

Explanation: Space Time Transmit Diversity (STTD) is a technique of transmit diversity used in UMTSS third-generation cellular systems. Space Time Transmit Diversity is optional in the UTRANN air interface, but compulsory for user equipment.

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13
Q:

MIMO means both transmitter and receiver have multiple antennas.

A) True B) False
 
Answer & Explanation Answer: A) True

Explanation: MIMO provides a way of utilising the multiple signal paths that exist between a transmitter and receiver to significantly improve the data throughput available on a given channel with its defined bandwidth. It uses multiple antennas at the transmitter and receiver along with some complex digital signal processing.

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5
Q:

Which of the following technology does not use MIMO?

A) 4G B) Wifi
C) WiMax D) AMPS
 
Answer & Explanation Answer: D) AMPS

Explanation: MIMO is used in mobile radio telephone standards such as recent 3GPP and 3GPP2. In 3GPP, High-Speed Packet Access plus (HSPA+) and Long Term Evolution (LTE) standards take MIMO into account. Moreover, MIMO is also used in Wifi and WiMax.

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15
Q:

MIMO technology makes advantage of a natural radio wave phenomenon called _________

A) Reflection B) Multipath
C) Refraction D) Diffraction
 
Answer & Explanation Answer: B) Multipath

Explanation: MIMO technology makes use of multipath phenomenon to maximize transmission by receiving bounced signals from obstructions. Multipath is a phenomenon in wave propagation.

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5
Q:

MIMO is a smart antenna technology.

A) True B) False
 
Answer & Explanation Answer: A) True

Explanation: MIMO is one of several forms of smart antenna technology, the others being MISO (multiple input, single output) and SIMO (single input, multiple output). It is an antenna technology for wireless communications in which multiple antennas are used at both the source and the destination.

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17
Q:

MIMO was initially developed in the year __________

A) 1980 B) 1990
C) 1980 D) 1975
 
Answer & Explanation Answer: B) 1990

Explanation: Since the initial development in the year 1990, MIMO Wireless Communications have become integral part of the most forthcoming commercial and next generation wireless data communication systems.

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