109 – COMMUNCATION – F

Task Assignment: Communications Coursework (Part A Group F & Part B)

You are required to complete the Communications coursework in a fully accurate, professional, and academically rigorous manner. The work must include Part A (Group F) and Part B (MATLAB/Simulink Implementation). Ensure that all solutions are clearly presented, mathematically correct, and supported with proper explanations and analysis.

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# Part A: Theoretical Analysis (Group F)

You must solve all problems under Group F (Problems F1F5). Each problem must include complete derivations, numerical results, and where required, clear plots or sketches.

## General Requirements:

– Show all mathematical steps clearly and logically.

– State formulas before substitution.

– Provide final numerical answers for all results.

– Include plots (MATLAB preferred) where required.

– Add a brief discussion after each problem.

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## Problem F1: AM Signal Analysis

– Determine the modulation index from the given AM waveform.

– Calculate the total signal power.

– Determine the bandwidth of the AM signal.

– Clearly explain each step and interpret the results.

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## Problem F2: Armstrong FM Modulator

– Determine the required frequency multiplication factors (n1 and n2).

– Use the given parameters such as carrier frequency, deviation, and oscillator frequency.

– Clearly show how frequency multiplication affects both the carrier frequency and frequency deviation.

– Explain why the condition fLO > n1 fc1 is required.

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## Problem F3: Nyquist Transmission Analysis

– Determine whether the given pulse satisfies the Nyquist criterion.

– Evaluate each case:

– 16-QAM

– 8-PSK (two cases)

– QPSK

– Calculate symbol rate and required bandwidth.

– Justify each answer clearly.

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## Problem F4: Quantization Analysis

– Determine the required preprocessing (such as companding or scaling).

– Calculate the quantizer range and number of quantization levels.

– Ensure all results satisfy the required SQNR and probability constraints.

– Show complete mathematical steps.

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## Problem F5: WLAN Communication System

– Calculate the bit rate using the given modulation parameters.

– Determine the receiver sensitivity required for the specified BER.

– Perform a full link budget analysis including transmit power, antenna gains, and path loss.

– Calculate the maximum communication range.

– Clearly justify all assumptions and results.

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# Part B: MATLAB / Simulink Communication System

You are required to design and simulate a complete digital communication system using MATLAB or Simulink.

## Objective:

Design a system capable of transmitting data over a poor-quality communication channel and evaluate its performance.

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## System Design Requirements:

### Transmitter:

– Generate binary data.

– Apply an appropriate modulation scheme such as BPSK, QPSK, QAM, or PAM.

– Implement pulse shaping using suitable filters such as Root Raised Cosine.

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### Channel:

– Model realistic impairments including:

– Additive White Gaussian Noise (AWGN)

– Signal attenuation

– Propagation delay

– Optional multipath effects

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### Receiver:

– Perform demodulation.

– Apply matched filtering.

– Implement synchronization if required.

– Recover the transmitted data accurately.

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## Simulation Tasks:

– Build the system using MATLAB or Simulink.

– Test multiple modulation techniques.

– Analyze performance under different SNR conditions.

– Measure and report Bit Error Rate (BER).

– Compare performance results.

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## Analysis and Discussion:

– Explain the impact of noise and channel impairments on system performance.

– Compare different modulation techniques in terms of efficiency and reliability.

– Suggest improvements such as error correction coding, adaptive modulation, or power optimization.

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# Report Requirements

The final report must include:

1. Introduction

2. Part A (Group F Solutions)

– Full derivations

– Numerical results

– Plots and explanations

3. Part B (Simulation)

– System design and block diagram

– Simulation results

– Performance analysis

4. Discussion

5. Conclusion

6. References

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# Individual Reflections (Mandatory)

The group consists of 5 members, and each member must submit an individual reflection.

Each reflection must include:

– Description of individual contribution

– Tasks performed in Part A and/or Part B

– Skills and knowledge gained

– Challenges faced and how they were addressed

– Personal evaluation of teamwork

Each reflection must be clearly labeled with the students name.

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# Additional Notes

– Ensure all work is original and properly referenced.

– Maintain clear academic writing and formatting.

– Submit MATLAB/Simulink files along with the report.

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The final submission must be complete, well-structured, and suitable for academic evaluation at a high standard.

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