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Bt0086
fall 2016
1
How “wireless and mobile are two different concepts”. Explain any two
applications that use wireless networks and mobile communications.
Answer: TDMA is the access
method used by the Electronics Industry Alliance and the Telecommunications
Industry Association for Interim Standard 54 (IS-54) and Interim Standard 136
(IS-136). Using TDMA, a narrow band that is 30 kHz wide and 6.7 milliseconds
long is split time-wise into three time slots. Narrow band means channels in
the traditional sense. Each
2
What is modulation? Briefly explain Amplitude Modulation (AM), Frequency
Modulation (FM) & Phase modulation (PM).
Answer: Modulation
The
modulation technique used on the radio channel is Gaussian Minimum Shift Keying
(GMSK). GMSK belongs to a family of continuous-phase modulation procedures,
which have the special advantages of a narrow transmitter power spectrum with
low adjacent channel interference, on the
3
Explain the GSM TDMA frame with the help of frame structure.
Answer: There are five kinds
of burst GSM TDMA frame:
Normal Burst (NB): The NB is used to
transmit information on traffic and control (except RACH) channels. The
individual bursts are separated from each other by guard periods during which
no bits are transmitted. At the start and end of each burst are three tail bits
which are always set to logical ‘0’. These bits fill a short time span during
which transmitter power
4. Explain Source
Coding and Speech Processing.
Answer:
Source Coding and Speech Processing
Source
coding reduces redundancy in the speech signal and thus results in signal
compression, which means that a significantly lower bit rate is achieved than
needed by the original speech signal. The speech coder/decoder is the central
part of the GSM speech
processing
5. Write short notes
on Cluster-based routing protocol.
Answer:
In Cluster Based Routing protocol (CBRP) [Jiang99], the nodes are
divided into clusters. To form the cluster the following algorithm is used.
When a node comes up, it enters the "undecided" state, starts a timer
and broadcasts a Hello message. When a cluster-head gets this hello message
6. Mention and
explain different Table-Driven Routing Protocols.
Answer:
Table-driven
Routing Protocols: Keeps
routing tables at each node, which is updated periodically, and the routing
procedure is based on this data.
One
routing-table driven method is the next-hop model. In this
model, each node keeps the best next-hop node
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