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Fall 2015
Bt0086
1
Write short notes on: (i) Amplitude Shift Keying (ASK) (ii) Frequency Shift
Keying (FSK) and (iii) Phase Shift Keying (PSK).
Answer: (i) Amplitude-shift
keying (ASK) is a form of amplitude modulation that represents digital data as
variations in the amplitude of a carrier wave. In an ASK system, the binary
symbol 1 is
2
What is near and far effect problem in wireless communication? Explain in
brief.
Answer: Near and far terminals in the wireless networks suffer from the problem
of near/far effect due to different level of signal power received by them. As
shown in figure below,
3
Explain about the Operation Sub System (OSS) of GSM system.
Answer: The operation subsystem (OSS) contains the necessary functions for
network operation and maintenance. The OSS possesses network entities of its
own and accesses other entities via SS7 signaling.
OSS consists of the
4
Explain Hard handover and Soft handover in UMTS.
Answer: Hard handover: When the User
Equipment (UE) switches between different antenna and different systems then
there the carrier frequency used for communication also changes. When the
carrier frequency changes for communication, we say this type of handover as
hard handover. This type of handover is only in UTRA TDD. Switching between TDD
cells is
5
List the advantages and disadvantages of Infra-red technology.
Answer: Infra- red Technology uses light at 900 nm wavelength. Transmitters can
be simple light emitting diodes (LEDs) or laser diodes whereas photodiodes act
as receivers. PDAs, laptops, notebooks, mobile phones etc. have an infrared
data association (IrDA)
6
Draw the WiMAX network architecture and describe it in brief.
Answer: The WiMAX network
architecture defines the system after the air interface to enable a full end to
end network to be achieved.
In order that
elements of network equipment can be used from different suppliers, it is
necessary to define the
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