(1) ___True__ Radio waves are comprised of both an electric field and a magnetic
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Question
(1) ___True__ Radio waves are comprised of both an electric field and a magnetic field
(2) __False__ In 1977, the FCC authorized construction of two developmental cellular systems: one in the Baltimore/Washington D.C. corridor, and one in Detroit.
(3) ______ “B” side cellular market licenses were originally awarded to cellular carriers
who were affiliated with the local telephone company..
(4) ___false__ The radio transmission from the cell base station to the mobile phone is known as the uplink, or “reverse channel”.
(5) ______ Wireless conversations are simplex transmissions.
(6) ______ In cellular networks, cell / mobile phones can and will have their power
levels adjusted based on their proximity to the cell base station.
(7) ______ Bluetooth is what is known as an “enabling” technology
(8) ______ Cell coverage areas will be larger in urban areas and smaller in rural areas
(9) ______ In today’s environment, the HVAC ducting systems of large buildings can actually be used as transmission systems for in-building wireless coverage and operation.
(10) ______ Cell base stations using identical frequency sets (i.e. “co channel cells”) should never be deployed right next to each other.
(11) ______ If RF power remains constant (unchanged) and a new antenna is installed at a cell site, and the new antenna increases gain by 3dB, the ERP of the site will double.
(12) ______ The concept of Rayleigh fading involves both reflected RF paths, but also
a direct, or “strongest” signal, from end to end (base to mobile, or mobile to base).
(13) ______ Gain is a logarithmic progression.
(14) ______ There are four main types of signal fading: absorption, free-space loss, ducting, and cross channel equalization
(22) Which technology is known as a form of “nonsinusoidal communication”, where radio energy is transmitted in pulses instead of waves, at very, very low power?
(a) Near Field Communications (NFC)
(b) Bluetooth
(c) Ultra Wideband Wireless (UWB)
(d) Cognitive radio
(e) Software defined radio
(23) Converting an omnidirectional cell (“omni cell”) into a cell with three sets of directional antennas, where the antenna beamwidths will add up to 360 degrees, and the cell’s capacity is effectively tripled, is known as what?
(a) Cell splitting
(b) Beamforming
(c) Temperature inversion
(d) Sectorization
(d) Gai
(24) The control channel at a cell base station is a data messaging channel that performs which tasks?
(a) Autonomous mobile registration
(b) locating (paging) wireless phones for purposes of terminating calls
(c) grooming of channel pairs
(d) collecting customer calling information such as billing and traffic statistics
(e) setup of all cellular calls
(f) all of the above
(g) a, b, d, and e only
(h) c only
(25) The higher the frequency of a radio signal, the greater the what?
(a) absorption rate
(b) free-space loss
(c) antenna reverberation
(d) co-channel interference
(e) Intermodulation interference
Explanation / Answer
5.
The given statement is false. Simplex transmission means only one way communication. But in real world we are having two way transmission in wireless conversations. An example of simplex trasmission is Radio.
8.
The given statement "Cell coverage areas will be larger in urban areas and smaller in rural areas" is false. this is because for any antenna the cell coverage area is always same. but the only difference is in the presence of number of antennas. that is in rural areas the number of cell towers is less when compared to the number of cell towers in urban areas.
12.
the given statement "The concept of Rayleigh fading involves both reflected RF paths, but also a direct, or “strongest” signal, from end to end (base to mobile, or mobile to base)" is false. this is because Rayleigh fading is valid only when there is no dominant propagation along the line of sight or direct propagation between end to end. When there is dominant propagation along line of sight then the fading is Rician fading.
22.
UWB is the non sinusoida form of transmission. UWB means ultra wideband wireless transmission. in this type of transmission we do not use carrier signals for modulation. it employs discrete pulses of electromagnetic energy. For this reason it also called impulse radio.
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