# Evolution of networks

Part 1

You are required to carry out the literature review on the evolution of cellular networks. Conducting up to date research survey on the evolution of mobile communication systems. The candidates are required to investigate the effects of risks (such as health and safety, commercial, and security) due to this evolution of mobile communication system. This task aims to study the current state of the art developments in the modern mobile and wireless telecommunication systems and risks such as security, ethical, and health and safety issues involved in such systems.

You are required to:

• Understanding the subject
• Correct Terminology
• 3rd Person
• References (must be peer reviewed journals)
• Citations
• Flow nicely

*Word count for this report is 1500 words.

Part 2

Do the theoretical calculations along with modelling of different aspects in communication system and interpretation of results.

The purpose of a communication system is to carry information from a source

to a destination through a reliable medium. In practice, the issues arise in

transmitting the baseband signal. The limitations of baseband transmission

can be overcome using modulation. It is a technique in which the baseband

signal is translated from lower frequency on to the higher frequency of the

carrier wave. In analogue communications, the modulation techniques are

categorized into linear and nonlinear modulation schemes. They can be given

as:

Linear Modulation schemes

– Amplitude modulation (AM),

– Double sideband suppressed carrier amplitude modulation (DSBSC-AM),

– Single sideband suppressed carrier amplitude modulation (SSBC-AM)

– Vestigial sideband modulation (VSB)

Nonlinear Modulation schemes

– Frequency modulation (FM)

– Phase modulation (PM)

You are required to select any two from linear modulation

schemes and one from nonlinear modulation schemes and perform the

1. Derive expression for modulated signal for each modulation technique

when the baseband signal is ( ) = m 2 m and the carrier signal is

( ) = c 2 c

2. For each modulation technique ( ) is transmitted through Additive white

Gaussian noise channel with power spectral density

n = 1×10-11 !! and bandwidth of 5.5KHz. The channel has

attenuation of 50dB. Compute the SNR as function of transmitted power of

modulated signal, when the signal is detected using coherent detection.

3. Plot the SNR with respect to the transmitted power of the received

modulated signal for each modulation scheme. Compare the SNR results

and comment on the performance of the respective modulation techniques

Word count for this report is 1500 words with discerption.

The report should include:

A description of the overall purpose of each component in the design

and why it is required. Note: for this section you will need to use your

background research on communication channel impairments and

techniques which can be used to help deal with these

***In-Text Citations and References using Harvard style

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