Gsm uses ________ number of frequency range.
Wireless & Mobile Communications MCQ & Answers- Paging System1. Which of the following is not a standard used for paging system? Show
Answer :- c) IS-95 2. Paging system uses which mode of transmission? 3. The information sent by paging system is known as a ___________ 4. Which type of message cannot be sent with the help of paging system? 5. What is a paging access number? 6. Which type of transmission technique is employed by paging system? 7. Which of the following is not the property of paging system? 8. Which of the following properties
describes the transmitters and receivers in paging system? 9. What is a pager in the paging system? 10. Who introduced the paging system for the first time? Wireless & Mobile Communications WCQ & Answers- Cordless Telephone Systems1. Which of the following is a protocol used for cordless telephone system? 2. In
which frequency range do the cordless phones mostly work? 3. Which of the following is the drawback for cordless telephones? 4. Which of the following is a fully digital cordless system? 5. Which of the following is an example of local wireless system? 6. Which of the following is not a standard for cordless telephony? 7. What is the range of cell diameter of DECT? 8. Which of the following
standard of cordless telephone system is also approved as a 3G standard? 9. Cordless telephone system will not work under which of the following criteria? 10. Which of the following is not an application of DECT? Wireless & Mobile Communications WCQ & Answers- Cellular Telephone Systems1. Which of the following is
not a characteristic of cellular telephone system? 2. What is the responsibility of MSC in cellular telephone system? 3. Who has the responsibility of billing and system maintenance function in cellular system? 4. What is the function of FVC (Forward Voice Channel)? a) Voice transmission from base station to mobiles 5. Which two channels are responsible for initiating mobile calls? 6. Of the total channels present in the cellular system, what is the percentage of
voice and control channels? 7. What is MIN? 8. What is transmitted along with the call initiation request during the origin of call by a mobile? 9. What does SCM indicates? 10. What is the shape of the cell present in the cellular system? 11. Why the size of the cell is kept small in cellular network? 12. What is handoff? 13. Which one is not an advantage of using frequency reuse? 14. The process of transferring a mobile station from one base station to another is ____________ 15. The interference between the neighbouring base stations is avoided by ____________ Wireless & Mobile Communications WCQ & Answers- Second Generation (2G) Cellular Networks1. Which of the following multiple access techniques are used by second generation cellular systems? 2. Which one is not a TDMA standard of second generation networks? 3. Which of the following is a CDMA standard of second generation network? 4. Popular 2G CDMA standard IS-95 is also known as ______________ 5. How many users or voice channels are supported for each 200 KHz channel in GSM? 6. How many voice channels are supported for each 30 KHz radio channel in IS-136? 7. How many users are supported in IS-95 for each 1.25 MHz? 8. Which modulation technique is used by GSM? 9. IS-95 uses which
modulation technique? 10. IS-136 uses which modulation technique? 11. Which is one of the disadvantages of 2G standards? 12. GSM (Global System for Mobile) was earlier also known as _____________ 13. 2G CDMA standard, IS-95, was proposed by which company? 14. Which one of the following 2G standard is used in Japan? 15. The 2G GSM technology uses a carrier separation of _____________ Wireless & Mobile Communications WCQ & Answers –2.5G1. What is the name of the
web browsing format language supported by 2.5G technology? 2. What is the name of the internet microbrowser technology used by NTT DoCoMo in Japan? 3. 2.5G upgrade path for a particular wireless carrier does not match the original 2G technology choice made earlier by the same carrier. 4. Which of the following is not a TDMA standard of 2.5G network? a) HSCSD 5. Which of the following is a 2.5G CDMA standard? 6. HSCSD supports which 2G standard? 7. How does HSCSD
differs from the GSM to obtain higher speed data rate? 8. GPRS and EDGE supports which 2G standard? 9. How is HSCSD different from GPRS? 10. What changes GPRS need to acquire while upgrading itself from GSM? 11. Which new modulation technique is used by EDGE? 12. Various air interface formats used by EDGE are also known as ___________ 13. EDGE is sometimes also referred as ____________ 14. What is one disadvantage of EDGE in comparison to HSCSD and GPRS? Wireless & Mobile Communications WCQ & Answers – Third Generation (3G) Wireless Networks1. Which of the following is not a characteristic of 3G network? 2. What is the term used by ITU for a set of global standards of 3G systems? 3. Which of the following leads to evolution of 3G networks in CDMA systems? 4. Which of the following leads to the 3G evolution of GSM, IS-136 and PDC systems? 5. What is 3GPP? 6. What is 3GPP2? 7. Which of the following is not a standard of 3G? 8. Which of the following 3G standard is used in Japan? 9. What
does the number 2000 in IMT-2000 signifies? 10. Which of the following is not an application of third generation network? Wireless & Mobile Communications WCQ & Answers – 3G W-CDMA (UMTS)1. What is the full form of UMTS? 2. UMTS use which multiple access technique? 3. UMTS does not has backward compatibility with ____________ 4. UMTS is also known as _____________ a) IS-95
5. What is the chip rate of W-CDMA? 6. W-CDMA works in FDD mode only. 7. How much packet data rate per user is supported by W-CDMA if the user is stationary? 8. What is the minimum spectrum allocation required by W-CDMA? 9. W-CDMA requires a complete change of RF equipment at each base station. 10. How much increase in spectral efficiency is provided by W-CDMA in comparison to GSM? Wireless & Mobile Communications WCQ & Answers – 3G Cdma20001. Which of the following has no backward compatibility with 3G Cdma2000? 2. 2G and 2.5G CDMA operators may selectively introduce 3G capabilities at each cell
without changing entire base stations and reallocate spectrums. 3. Which of the following the first 3G CDMA air interface? 4. Within ITU IMT-2000 body, Cdma2000 1xRTT is also known as ____________ a) Cdma2000 1xEV-DO 5. How many users are supported by Cdma2000 1X in comparison to 2G CDMA standard? 6. Cdma2000 works in TDD mode only. 7. Which of the following is
not a characteristic of Cdma2000? 8. Cdma2000 1xEV was developed by ________ 9. How is bandwidth increased in Cdma2000? 10. What are the two options provided by Cdma2000 1xEV? 11. Which of the following is not backward compatible with Cdma2000? Wireless & Mobile Communications WCQ & Answers -Wireless Local Area Networks (WLANs)1. What is the full form of WLAN? 2. WLANs use high power levels and generally require a license for spectrum use. 3. What is the name of 300 MHz of unlicensed spectrum allocated
by FCC in ISM band? 4. Which of the following specifies a set of media access control (MAC) and physical layer specifications for implementing WLANs? 5. Which of the following is not a standard of WLAN? 6. Which of
the following is the 802.11 High Rate Standard? 7. Which of the following spread spectrum techniques were used in the original IEEE 802.11 standard? 8. Which of the following WLAN standard has been named Wi-Fi? 9. Which of the following is developing CCK-OFDM? 10. What is the data rate of HomeRF 2.0? 11. HIPER-LAN stands for ____________ 12. What is the range of asynchronous user data rates provided by HIPER-LAN? 13. What is the name of the European WLAN standard that provides user data rate upto 54 Mbps? 14. What is WISP? 15. The price of WLAN hardware is more than 3G telephones
and fixed wireless equipment. Wireless & Mobile Communications WCQ & Answers -Bluetooth and Personal Area Networks (PANs)1. Which of the following is not an open standard? 2. What is the nominal range of Bluetooth? 3. Bluetooth standard is named after ___________ 4. Bluetooth operates in which band? a) Ka Band 5. Which of the following scheme is used by Bluetooth? 6. What is
the range of time slot in Bluetooth? 7. Which modulation scheme is used by Bluetooth? 8. What is the channel symbol
rate in Bluetooth for each user? 9. What is the raw channel bit error rate of Bluetooth? 10. Which
of the following standard committee specifies Bluetooth and other Personal Area Networks (PAN)? Wireless & Mobile Communications WCQ & Answers – Frequency Reuse1. Cellular concept replaces many low power transmitters to a single high power
transmitter. 2. Why neighbouring stations are assigned different group of channels in cellular system? 3. What is a cell in cellular system? 4. What is
frequency reuse? 5. Which of the following is a universally adopted shape of cell? 6. Actual radio coverage of a cell is called __________ 7. Why the shape
of cell is not circle? 8. What is the main reason to adopt hexagon shape in comparison to square and triangle? 9. Which type of antenna is used for center excited cells? 10. Which type of antenna is used for edge excited cells? 11. For a cellular system, if there are N cells and each cell is allocated k channel. What is the total number of available radio channels, S? 12. What is a cluster in a cellular system? 13. What is a frequency reuse factor for N number of cells in a system? 14. Capacity of a cellular system is directly proportional to __________ 15. A spectrum of 30 MHz is allocated to a cellular system which uses two 25 KHz simplex channels to provide full duplex voice channels. What is the number of channels available per cell for 4 cell reuse factor? Wireless & Mobile Communications Questions & Answers – Channel Assignment Strategies1. Which of the following is not an objective for channel assignment strategies? 2. The choice of channel assignment strategy does not impact the performance of the system. 3. In fixed channel assignment strategy, each cell is allocated a predetermined set of _______ 4. What happen to a call in fixed channel strategy, if all the channels in a cell are occupied? 5. What is a borrowing strategy in fixed channel assignments? 6. In dynamic channel assignment strategy, voice channels are allocated to different cells permanently. 7. In dynamic channel assignment strategy, base station requests channel from ____________ 8. Dynamic channel assignment reduces the likelihood of blocking in comparison to fixed channel assignment. 9. RSSI stands for
________ 10. What is the drawback of dynamic channel assignment? Wireless & Mobile Communications Questions & Answers – Handoff Strategies1. What is the condition for handoff? 2. Handoff does not require voice and control channel to
be allocated to channels associated with the new base station. 3. The time over which a call can be maintained within a cell without handoff is called _________ 4. Dwell time does not depend on which of the following factor? 5. Which of the following is associated with the handoff in first generation analog cellular systems? 6. MAHO stands for ______ 7. A handoff is initiated when the power received from the base station of a neighbouring cell falls behind the power received from the current base station by certain level. 8. What is the condition for intersystem interference? 9. What is the disadvantage of guard channel? 10. Which of the following priority handoff method decrease the probability of forced termination of a call due to lack of available channels? 11. Umbrella cell approach is possible by using _________ 12. Cell dragging is a problem occur due to __________ 13. What was the typical handoff time in first generation analog cellular systems? 14. How much time it takes for handoff in digital cellular systems like GSM? 15. Soft handoff is also known as _________ Wireless & Mobile Communications Questions & Answers – Interference and System Capacity1. Which of the following is not a source of interference? 2. Interference on voice channels causes _______ 3. Interference in control channel leads to ________ 4.
Interference is more severe in rural areas. 5. What are co-channel cells? 6. Co-channel interference is a function of _________ 7. Co-channel reuse ratio is define by _________ 8. Co-channel ratio in terms of cluster size is defined as _________ 9. What is the cluster size for CDMA? 10. What is breathing cell effect? 11. Adjacent channel interference occurs due to _______ 12. Which of the following problem occur due to adjacent channel interference? 13. In near-far effect, a nearby transmitter captures the __________ 14. Adjacent channel interference can be minimized through _______ 15. In dynamic channel assignment, any channel which is being used in one cell can be reassigned simultaneously to another cell in the system at a reasonable distance. Wireless & Mobile Communications Questions & Answers – Trunking and Grade of Service1. What is the concept for accommodating a
large number of users in a limited radio spectrum? 2. On termination of call, the occupied channel is not returned to the pool of available channels in trunking. 3. In trunking system, when the channel is already in use, the call is blocked or queued. 4. Who developed the fundamental of trunking theory? 5. What is the unit for the measure of traffic intensity? 6. One
Erlang represents _________ 7. What is the measure of the ability of user to access a trunked system during the busiest hour? 8. GOS is typically given as a likelihood that a ________ 9. The time requires to allocate a trunked radio channel to a requesting user is called _______ 10. Average duration of a typical call is called ________ 11. The average number of call requests per unit time is also known as ________ 12. Traffic intensity offered by each user is the product of __________ 13. AMPS cellular system is designed for a GOS of _____ blocking. 14. Blocked calls cleared formula is also known as _______ formula. 15. Blocked calls delayed formula is also known as _______ Wireless & Mobile Communications Questions & Answers – Improving Coverage and Capacity in Cellular Systems1. Which of the following techniques do not help in expanding the capacity of cellular system? 2. ________ uses directional antennas to control interference. 3. _______ allows an orderly growth of cellular system. 4. Which of the following technology distributes the coverage of the cell and extends the cell boundary to hard-to-reach places? 5. Which of the following increases the
number of base stations in order to increase capacity? 6. Which of the following trunking inefficiencies? 7. The process of subdividing a congested cell into smaller cells is called _______ 8. Cell splitting increases the capacity of a cellular system since it increases the number of times ________ are reused. 9. Cell splitting do not maintain the minimum c-channel reuse ratio. 10. Which of the following technique is used to limit radio coverage of newly formed microcells? 11. Sectoring increases SIR (Signal to Interference Ratio). 12. Which of the following has range
extension capability? 13. Repeaters has one drawback of reradiating ____________ 14. Which of the following is not an advantage of micro cell zone technique? 15. In a micro cell zone concept, when a mobile travels from one zone to another within the cell, it retains the same _________ Wireless & Mobile Communications Questions & Answers – Free Space Propagation Model1. The mechanism behind electromagnetic wave propagation cannot be attributed to ___________ 2. The propagation model that estimates radio coverage of a transmitter is called ___________ 3. Propagation model that characterize rapid fluctuation is called _________ 4. Small scale propagation model is also
known as _________ 5. Free space propagation model is to predict ______ 6. Which of the following do not undergo free space propagation? 7. The free space model predicts that received signal decays as a function of _________ 8. Relation between gain and effective aperture is given by ______ 9. Relation between wavelength and carrier frequency is _________ 10. Which of the following antenna radiates power with unit gain uniformly in all directions? 11. EIRP is abbreviated as __________ 12. Path loss in free space model is defined as difference of ________ 3. Far field region is also known as _________ 14. Fraunhofer distance is given by _____ 15. Which of the following is
called an ideal antenna? Wireless & Mobile Communications Questions & Answers – Reflection1. Which of the following mechanism do not impact propagation in mobile communication
system? 2. What is the dimension of object as compared to wavelength of propagating wave when reflection occurs? 3. When does the wave propagating from one medium to another gets partially reflection and partially transmitted? 4. What is the case of reflection, in course of second medium being a perfect dielectric? 5. What is the case of reflection, in course of second medium being a perfect conductor? 6. Which of the following relates the incident and reflected & transmitted wave? 7. Reflection coefficient is not a function of __________ 8. Polarized wave can be mathematically represented as sum of ________ 9. The plane of incidence contains only incident rays. 10.
Permittivity and conductivity are insensitive to ______ for a good conductor. 11. Velocity of electromagnetic wave can be given by _______ 12. The boundary condition at the surface of incidence obeys ________ 13. The angle at which no reflection occurs in the medium of origin is called _________ Wireless & Mobile Communications Questions & Answers – Diffraction1. Diffraction occurs when radio path between Tx. And Rx. Is obstructed by ____________ 2. At high frequencies, diffraction does not depends on
___________ 3. Diffraction allows radio signals to propagate around ________ 4. Which principle explains the phenomenon of diffraction? 5. Diffraction is caused by propagation of secondary wavelets into _______ 6. Difference between the direct path and the diffracted path is called _______ 7. The phase difference between a direct line of sight path and diffracted path is function of _______ 8. Which of the following explains the concept of diffraction loss? 9. In mobile communication system, diffraction loss occurs due to ______ 10. For predicting the field strength in a given service area, it is essential to estimate ______ Wireless & Mobile Communications Questions & Answers – Scattering1. Scattering occurs when medium consists of objects with dimensions _______ compared to the wavelength. 2. Scattered waves are produced at ________ 3. The actual received signal is ______ than what is predicted by reflection and diffraction model. 4. Scattered energy in all directions provides _________ at a receiver. 5. Surface roughness are often tested using __________ 6. A surface is considered rough if protuberance is ________ than critical
height. 7. RCS of scattering object is defined as the ratio of _______ 8. Which equation is used to calculate the received power due to scattering for urban mobile radio system? 9. In ionosphere propagation, waves arriving at the receiving antenna using the phenomenon of _______ 10. Power density is basically termed as ________ power per unit area. Wireless & Mobile Communications Questions & Answers – Practical Link Budget Design Using Path Loss Models1. Empirical approach is based on fitting curve or analytical expressions. 2. Which of the following is not a practical
path loss estimation technique? 3. Average received signal power decreases __________ with distance. 4. What does path loss exponent indicates? 5. The reference distance should not be in the far field of the antenna. 6. Which distribution describes the shadowing effect? 7. Log normal shadowing is a phenomenon that occurs with same T-R separation having
same level clutter on the propagation path. 8. Log normal shadowing implies that measured signal levels at specific T-R separation have ______ distribution when signal levels have values in dB units. 9. A link budget is accounting of all __________ 10. Antenna’s efficiency is given by the ratio of __________ Wireless & Mobile Communications Questions & Answers – Outdoor Propagation Models1. Which of the following is not an outdoor propagation model? 2. Longley –Rice model is applicable to _________ 3. Longley-Rice prediction model is also referred as _________ 4. The extra term for additional attenuation due to urban clutter near the receiving antenna is called __________ 5. Longley Rice model’s merit is to provide corrections due to environmental factors. 6. Which method is
used by Edwards and Durkin algorithm to calculate the loss associated with diffraction edges? 7. Durkin’s model can read digital elevation map. 8. Which of the most widely used model for signal prediction in urban areas? 9. Okumura model is applicable for distances of _________ 10. Okumura model is considered to be complex in predicting path loss. 11. Which of the following is the major disadvantage of the Okumura model? 12. The Hata model is empirical formulation of which model? 13. Hata model is well suited for _________ 14. Which of the following considers the impact of rooftops and building? Wireless & Mobile Communications Questions & Answers – Indoor Propagation Models1. The variability of the environment is slower for a smaller range of T-R separation distances in indoor models. 2. Propagation within building is not influenced by _________ 3. Smaller propagation distances make it more difficult to insure far-field radiation for all receiver location and types of antenna. 4. What is hard partition? 5. Partitions that can be moved are called _______ 6. Losses between the floors of the building can be determined using ________ 7. Technique of drawing a single ray between the transmitter and receiver is called ______ 8. ________ is a process of converting plain text into cipher text. 9. _______ reduces the cell size to increase capacity. 10. _________ configuration describes a desktop in an office. Wireless & Mobile Communications Questions & Answers – Small-Scale Multipath Propagation1. Small scale fading describes the _________ fluctuations of the amplitude, phases of a signal. 2. Fading is caused by interference. 3. Which of the following is not an effect
caused by multipath in radio channel? 4. In urban areas, fading occurs due to height of mobile antenna ________ than height of surrounding structure. 5. Fading does not occur when mobile receiver is stationary. 6.
Apparent shift in frequency in multipath wave is caused due to relative motion between________ 7. Doppler shift is directly proportional to __________ 8. Which of the following factor does not influence small scale fading? 9. Signal will distort if transmitted signal bandwidth is greater than bandwidth of __________ 10. What is a measure of the maximum frequency difference for which signals are strongly correlated in amplitude? 11. The
Doppler shift for mobile moving with constant velocity, v is given by _______ 12. Doppler shift is positive if mobile is moving away from direction of arrival of the wave. Wireless & Mobile Communications Questions & Answers – Impulse Response Model of a Multipath Channel1. Small scale variations of a mobile radio signal are directly related to _______ 2. Impulse response is a narrowband characterization. 3. Mobile radio channel can be modelled as a ______ filter. 4. Impulse response does not play any role in characterization of the channel. 5. Received signal can be expressed as ______ of transmitted signal with channel impulse response. 6. Discretization of multipath delay axis of impulse response into equal time delay segments is called __________ 7. Small scale received power is ________ of average powers
received in each multipath component. 8. The received power of a wideband signal fluctuates significantly when a receiver is moved about a local area. 9. Average power for a CW signal is _______ to average received power for a wideband signal in small scale region. 10. The received local ensemble average power of wideband and narrowband signals are ________ Wireless & Mobile Communications Questions & Answers – Small- Scale Multipath Measurements1. Which of the following is not a small scale multipath measurement technique? 2. Direct RF pulse systems are
complex. 3. What is the main disadvantage of RF pulse system? 4. Why is the phase of individual multipath components are not received in RF Pulse system? 5. Spread spectrum
sliding correlator has better ________ in comparison to RF pulse system. 6. If a PN sequence has chip duration of Tc, then chip rate is given by ___________ 7. The maximal length of PN sequence, the sequence length for n number of shift register is ______ 8. The ratio between transmitter chip clock rate and the difference between the transmitter chip clock and difference between transmitter and receiver chip clock rates is called ___________ 9. Which of the following is not an advantage of spread spectrum channel sounding system? 10. Which of the following is a disadvantage of spread spectrum channel sounding system? 11. There is no relationship between time domain and frequency domain techniques. 12. Transmissivity is a _________ domain response. 13. Frequency domain channel sounding technique do not require hard wired synchronization between transmitter and receiver. 14. Frequency domain channel sounding system is _______ in nature. 15. Faster sweep time can be accomplished by ________ Wireless & Mobile Communications Questions & Answers – Parameters of Mobile Multipath Channels1. Power delay profile is represented as plots of __________ with respect to fixed time delay reference. 2. Which of the following is not a multipath channel parameter that can be determined from power delay profile? 3.
The time dispersive properties of wideband multipath channel are quantified by ______ and _______ 4. _______ is the square root of the second central moment of the power delay profile. 5. Which of the following is the first moment of the power delay profile? 6. What is the
order of typical values of rms delay spread in outdoor mobile radio channels? 7. Power delay profile and magnitude frequency response of a mobile radio channel are related through _______ 8. ______ and coherence bandwidth are inversely proportional to one another. 9. Coherence bandwidth is a statistical measure of range of frequencies over which channel is considered
_______ 10. Which of the following describes time varying nature of the channel in a small scale region? 11. Doppler spread is a range of frequencies over which received Doppler spread is _______ 12. _______ is a statistical measure of time duration over which channel impulse response is invariant. Wireless & Mobile Communications Questions & Answers – Types of Small- Scale Fading1. Which of the following is not a channel parameter? 2. ______ leads to time dispersion and frequency selective fading. 3. Which of the following s not a characteristic of flat fading? 4. Spectral characteristics of the channel changes with time in flat fading. 5. Flat fading channel is
also known as _______________ 6. In a frequency selective fading, mobile radio channel possess a constant gain and a linear phase over bandwidth smaller than bandwidth of transmitted signal. 7. Frequency selective fading channels are also known as ________ 8. Frequency selective fading does not induce intersymbol interference. 9. For fast fading channel, the coherence time of the channel is smaller than _______ of transmitted signal. 10. In slow fading channel, Doppler spread of the channel is much less than the ________ of
baseband signal. Wireless & Mobile Communications Questions & Answers – Rayleigh and Ricean Distribution1. Which of the following distribution is used for describing statistical time varying nature of received envelope of multipath component? 2. Envelope of the sum of two quadrature Gaussian noise signal obeys _________ distribution. 3. For a Rayleigh fading signal, mean and
median differ by _______ 4. It is easy to compare different fading distributions using mean values instead of median values. 5. For a nonfading b) False 6. Ricean distribution degenerates to ________ distribution when the dominant component fades away. 7. The envelope of a bandpass
noise is __________ 8. The envelope of a sinusoid plus bandpass noise has __________ 9. What do you call an attenuation that occurs over many
different wavelengths of the carrier? 10. Which of the reception problems below that is not due to multipath? Wireless & Mobile Communications Questions & Answers – Statistical Models for Multipath Fading Channels1. Which of the following is not a statistical models for multipath fading channels? 2. Who presented
the first statistical model for multipath fading channel? 3. Clarke’s model assumes a horizontal polarized antenna. 4. A wave that is incident on mobile does not undergo Doppler shift. 5. Which of the following is an important statistics of a Rayleigh fading useful for designing error control codes and diversity schemes? 6. The level crossing rate (LCR) is defined as expected rate at which _______ fading
envelope crosses a specified level. 7. Level crossing rate is a function of _______ 8. Clarke’s model
considers the multipath time delay. 9. Saleh and Venezuela reported the results of ______ propagation measurements. 10. Saleh and Venezuela show that indoor channel is _______ time varying. 11. What is the full form of SIRCIM? Wireless & Mobile Communications Questions & Answers – Multipath Shape Factors for Small – Scale Fading1. The term small scale fading describes the slow fluctuations of received power level due to changes in receiver position. 2. The rapid fluctuations due to small scale
fading affect the _________ design. 3. An approximately omnidirectional channel model accurately describes fading statistics if directional antennas are employed at the receiver. 4. Which of the following
is not a principle shape factor? 5. Angular spread is a measure of how multipath concentrates about __________ 6. Angular constriction is a measure of how multipath concentrates about ______ azimuthal direction. 7. Shape factor, azimuthal direction of maximum fading is a directional parameter. 8. _______ of a stationary process is actually the variance of the rate of change. 9. Complex received voltage is a summation of __________ that have impinged upon receiver antenna. 10. Which of the following is equal to received power? 11. Which of the following is equal to received envelope? 12. Which of the following describes the average fading rate within a local area? 13. Angular constriction affects the average fading rate within local area. Wireless & Mobile Communications Questions & Answers – Frequency Modulation Vs. Amplitude Modulation1. Which is the process of encoding information from a message source in suitable manner for transmission? 2. The bandpass signal is called the modulating signal. 3. AM signal have all information in ______ of the carrier. 4. In frequency modulation, the amplitude of modulated carrier signal is ______and its frequency is ______ by the modulating message signal. 5. FM signals have all their information in
______ of the carrier. 6. Amplitude modulation has ______ relationship between the quality of the received signal and the power of the received signal. 7. FM has
_______ noise immunity when compared to amplitude modulation. 8. FM signals are _____ susceptible to atmospheric and impulse noise as compared to AM. 9. Burst noise affects FM systems. 10. AM has a modulation index. 11. Which of the following is an advantage of AM systems in comparison to FM sysytems? 12. An FM signal is a ______ envelope signal. 13. FM uses class______ amplifiers and AM uses class ______ amplifiers. 14. AM exhibits capture effect characteristics. 15. Which of the following is a drawback of FM systems? Wireless & Mobile Communications Questions & Answers – Amplitude Modulation1. Carrier signal in modulation technique is _______ signal. 2. Modulation index of an AM signal is ratio of __________ to the _______ 3. If the peak message signal amplitude is half the peak amplitude of the carrier signal, the signal is _____ modulated. 4. A percentage of modulation greater than ___________ will distort the message signal. 5. The RF bandwidth of AM is ____________ the maximum frequency contained in the modulating message signal. 6. Single sideband AM systems occupy same bandwidth as of conventional AM systems. 7. How is the performance of SSB AM systems in fading channels? 8. Which of the following is a disadvantage of tone-in-band SSB system? 9. FFSR in AM systems stands for
________ 10. AM demodulation technique can be divided into _____ and _____ demodulation. 11. Non coherent detection requires the knowledge of transmitted carrier frequency and phase at the receiver. 12. A product detector in AM systems is also called ___________ 13. AM system use only product detector for demodulation. They never use envelope detectors. Wireless & Mobile Communications Questions & Answers – Angle modulation1. FM is a part of general class of
modulation known as ______ 2. FM is called constant envelope because ______ of carrier wave is kept constant. 3. Which
of the following are two most important classes of angle modulation? 4. Frequency modulated signal is regarded as the phase modulated signal in which the
modulating wave is differentiated before modulation. 5. Frequency modulation index defines the relationship between the ______ and bandwidth of transmitted signal. 6. FM bandwidth is approximated using _______ rule. 7. Which of the following are two methods for generating FM signal? 8. In indirect method, the carrier frequency is directly varied in accordance with the input modulating signal. 9. Which of the following is used to vary
the frequency of the carrier frequency in accordance with the baseband signal amplitude variations in direct method of FM generation? 10. Frequency demodulator is a frequency to amplitude converter circuit. 11. Which of the following is not a technique for FM demodulation? 12. Which of the following FM demodulator is sometimes known as pulse averaging discriminator? 13. PLL in FM detection stands for ______ 14.
In angle modulation, signal to noise ratio before detection is a function of ______ 15. FM can improve the receiver performance through adjustment of transmitted power. Wireless & Mobile Communications Questions & Answers – Digital Modulation1. Modern mobile communication systems use analog modulation techniques. 2. Which of the following is not an advantage of digital modulation? 3. A desirable modulation scheme provides _________ bit error rates at __________ received signal to noise ratios. 4. The
performance of modulation scheme is not measured in terms of __________ 5. In digital communication system, in order to increase noise immunity, it is necessary to increase _________ 6. Which of the following is the ratio of signal energy per bit to noise power spectral density? 7. Increasing the data rate implies the increase in pulse width of digital
symbol. 8. Which of the following is the ratio of the throughput data rate per Hertz? 9. Which of the following is defined as the range of frequencies over which
the signal has a non zero power spectral density? 10. _______ is equal to width of main spectral lobe. Answer: a 11. Half power bandwidth is also called ______ What is GSM used for?GSM is a digital cellular communication standard that is universally accepted. The European Telecommunications Standards Institute created the GSM standard to define the procedures for second-generation digital mobile networks that are used by devices such as mobile phones.
What are the 3 different types of GSM?The GSM network is divided into three major systems: the switching system (SS), the base station system (BSS), and the operation and support system (OSS).
Which technique is used in GSM?The technology behind the Global System for Mobile communication (GSMTM) uses Gaussian Minimum Shift Keying (GMSK) modulation a variant of Phase Shift Keying (PSK) with Time Division Multiple Access (TDMA) signalling over Frequency Division Duplex (FDD) carriers.
How many categories of GSM are Mcq?Explanation: The GSM architecture consists of three major interconnected subsystems that interact between themselves and with the users through certain network interfaces. The subsystems are BSS (Base Station Subsystem), NSS (Network and Switching Subsystem) and OSS (Operation Support Subsystem).
|
