CIS117-6 Digital, Microwave and Optical Communications

CIS117-6 Digital, Microwave and Optical Communications - Majan University College

One - Digital, Microwave and Optical Communications

Learning outcome 1: Demonstrate a systematic understanding of the fundamental underpinning scientific principles of digital, microwave and optical communications and the corresponding system components.

Learning outcome 2: Critically analyse and assess digital, microwave and optical communication technologies, techniques, models and system design and performance

Assignment - Digital, Microwave and Optical Communications

You are required to complete the exercises that outlined below. There are exercises for each of the three components: Digital, Microwave and Optical Communications. The exercises are also included below for completeness. Each exercise has a number of marks associated with it, and you will need to answer all of the sub question for each component.

Digital communications

Q1 a) Explain the concept of entropy (information theory) with respect to digital communications

Q1 b) Using a diagram, explain the key components of a digital communications system

Q2 a) What is digital modulation used for within a digital communications system?

Q2 b) Explain three different ways of modulating a signal when only one degree of freedom is modulated

Q3) Consider a DMS where output is generated from an alphabet {a,b,c,d,e,f,g,h} with respective with probabilities {0.25, 0.1, 0.02, 0.05, 0.25, 0.03, 0.25, 0.05}.

a) Design a Huffman code and sketch the corresponding coding tree. Explain the codewords for each character in the alphabet

b) Calculate the average length of the codeword if the Huffman code you generated

c) Calculate the efficiency of your Huffman code

Q4) Design a Shannon-Fano code and sketch the corresponding coding tree where the alphabet is {a,b,c,d,e,f} with corresponding probabilities {0.5, 0.1, 0.05, 0.05, 0.25, 0.25}

Microwave communications

Q1) Antennas play a vital role in the performance of wireless communications systems. Microstrip patch antennas are very widely used in wireless applications due to their inherent features of simple design, low complexity, ease of fabrication and low cost to meet the design requirements.

The objective of this assignment is the design of a microstrip patch antenna for a practical Wireless Local Area Network (WLAN) application operating at ISM band in the range of 2.45 GHz. The antenna is excited using a microstrip transmission line.

a) The important dimensions that need to be optimised include length and width of the ground plane, patch and feed, and width and length of the two matching cuts on each side of the feed.

1. You need to design an antenna that needs to be matched such that the resonance frequency is:
fr = 2.45GHz + (last 3 digits of your student ID / 2)Mhz

For example, if your student ID number is 1322350 then the antenna working frequency should be as follows:
(350) f r = 2.45GHz + (300/2)MHz = 2.45GHz +150MHz = 2.6GHz

Optical communications

You have to design a Radio-over-Fiber System for a four-store hospital building that has 20 rooms per floor. The communication link is to be used for a wide variety of functions including locating physicians, requesting test results, checking patient records of patients and calling for mobile test data.

a) Show a block diagram of your designed system, justifying your selection of all the components. Clearly define all assumptions.

b) Analyse your system performance using excel sheet to demonstrate that the link budget of the designed system meets the requirements.

c) Implement the system in Optiwave and analyse its performance.

d) Compare the performance of the designed system with simulation results.

e) What is the maximum number of channels that your system can accommodate?

Supplement your answer by demonstrating a solution in Optiwave.

1. Select appropriate solutions from candidates when designing key system components

2. Analyse and evaluate the feasibility of your optical link prototype using suitable methods.

3. Design an optical link using appropriate software tools and laboratory equipment

4. Analyse and critically evaluate the feasibility of your prototype using suitable methods

5. Design and prototype a microwave component using laboratory equipment

6. Effectively and professionally present ideas and solutions

Attachment:- Microwave and Optical Communications.rar

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