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1. Dear students get fully solved assignments
Send your semester & Specialization name to our mail id :
“ help.mbaassignments@gmail.com ”
or
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[FALL 2015 ] ASSIGNMENT
PROGRAM BSc IT
SEMESTER FIFTH
SUBJECT CODE & NAME BT0086, Mobile Computing
CREDITS 4
BK ID B2067
MAX. MARKS 60
Note: Answer all questions.
Q1.Write short notes on:
(i) Amplitude Shift Keying (ASK)
Answer:Amplitude-shiftkeying(ASK)isaform of amplitude modulationthat represents digital data
as variationsinthe amplitude of acarrierwave.Inan ASKsystem, the binarysymbol 1isrepresented
by transmittingafixed-amplitude carrierwave andfixedfrequencyfora bit duration of T seconds. If
the signal value is1 thenthe carrier signal will be transmitted; otherwise, a signal value of 0 will be
transmitted.
Anydigital modulationscheme usesafinitenumberof distinctsignals to represent digital data. ASK
uses a finite number of amplitudes, each
(ii) Frequency Shift Keying (FSK) and
Answer:Frequency-shiftkeying(FSK) isafrequencymodulationscheme inwhichdigital information
istransmittedthrough discrete frequency changes of a carrier signal.[1] The technology is used for
communication systems such as amateur radio, caller ID and emergency broadcasts. The simplest
FSK is binary FSK (BFSK). BFSK uses a pair of discrete frequencies to transmit binary (0s and 1s)
information.[2] Withthisscheme,the "1"iscalledthe markfrequencyandthe "0" is calledthe space
frequency. The time domain of an FSK
(iii) Phase Shift Keying (PSK).

2. Answer: Phase-shift keying (PSK) is a digital modulation scheme that conveys data by changing
(modulating)the phase of areference signal (the carrier wave). It is widely used for wireless LANs,
RFID and Bluetooth communication.
Anydigital modulationscheme usesafinitenumberof distinct signals to represent digital data. PSK
uses a finite
Q. 2. What is near and far effect problem in wireless communication? Explain in brief.
Answer: The near-far problem or hearability problem is a situation that is common in wireless
communication systems, in particular, CDMA. In some signal jamming techniques, the near-far
problem is exploited to disrupt communications. The near-far problem is a condition in which a
receivercapturesastrongsignal and therebymakesitimpossibleforthe receivertodetecta weaker
signal. The near-far problem is particularly difficult in CDMA systems, where transmitters share
transmission frequencies and transmission time. By contrast, FDMA and TDMA systems are less
vulnerable.
Q. 3. Explain about the Operation Sub System (OSS) of GSM system.
Answer:The operations and maintenance center (OMC) is connected to all equipment in the
switching system and to the BSC. The implementation of OMC is called the operation and support
system (OSS).
Here are some of the OMC functions:
 Administration and commercial operation (subscription, end terminals, charging and
statistics).
Q. 4. Explain Hard handover and Soft handover in UMTS.
Answer:The Universal Mobile Telecommunications System (UMTS) is a third generation mobile
cellular system for networks based on the GSMstandard. Developed and maintained by the 3GPP
(3rd Generation Partnership Project), UMTS is a component of the International
Telecommunications Union IMT-2000 standard set and compares with the CDMA2000 standard set
for networks based on the competing cdmaOne technology. UMTS uses wideband code division
multiple access (W-CDMA) radio access technology to offer greater spectral efficiency and
bandwidth to mobile network operators.
Q. 5.List the advantages and disadvantages of Infra-red technology.

3. Answer:Asnext-generationelectronicinformation systems evolve, it is critical that all people have
access to the information available via these systems. Examples of developing and future
information systems include interactive television, touchscreen-based information kiosks, and
advancedInternetprograms.Infraredtechnology,increasingly present in mainstream applications,
holds great potential for enabling people with a variety of disabilities to access a growing list of
information resources. Already commonly
Q6.Draw the WiMAX network architecture and describe it in brief.
Answer:The WiMAXnetworkarchitecture definesthe systemafterthe air interface to enable a full
end to end network to be achieved.
In orderthat elementsof networkequipmentcan be usedfromdifferentsuppliers,it is necessary to
define the WiMAX network architecture that is common to all WiMAX networks. In this way
economiesof scale canbe gainedalongwithrobustnetworksthatare able to performreliablyunder
all conditions.
WiMAXnetworkbasics
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