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ME502 Overview of Digital communication Assignment - Melbourne Institute of Technology, Australia

Learning Outcomes -

a. Evaluate multiuser communication and resource sharing techniques;

b. Apply the techniques of, and report on, digital communication applications using Matlab and hardware devices.

Part A - The purpose of this assignment is to motivate students to understand the importance of multiuser resource allocation techniques employed in the uplink of modern digital communication networks using wireless medium for information transmission.

Requirements - Study and critique the multiuser resource allocation schemes used in the uplink of modern technologies: LTE-Advanced, LTE, Mobile WIMAX, CDMA2000, WCDMA and UMTS.

Answer - Multiuser Resource Allocation Techniques

LTE-Advanced, LTE, Mobile WIMAX, CDMA2000, WCDMA and UMTS are some Multiuser asset portion plans utilized in the uplink of current innovations. In these ongoing years remote correspondence generally broadband and versatile fast web has seen quick development. The advances developed in current correspondence are for the most part with assorted nature of administration, these are the digital communication techniques are Long term evolution, Code division multiple access. Dynamic asset assignment is utilized for higher ghostly effectiveness and to upgrade nature of administration.

The dangerous development of remote correspondence administrations brought about wretchedness of range and different assets except if the cutting edge advancements use the apportioned assets in an effective manner. Data and power are the two major resources that need to be monitored and controlled for better and efficient multiuser digital communication.

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Multiuser resource allocation schemes in LTE/LTE-Advanced

In LTE/LTE-Advanced, the high range productivity in the downlink is better in LTE and LTE-Advanced.The peak to Average power ratio (PAPR) is good in multiuser uplink and is utilized in SC-FDMA.

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Mobile WIMAX: Resource allocation in Multiuser

WIMAX is a digital system that is utilizing the uplink and downlink Orthogonal frequency division various access (OFDMA).

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WCDMA builds information transmission rates in GSM frameworks by utilizing the CDMA air interface rather than TDMA. WCDMA depends on CDMA and is the innovation utilized in UMTS. WCDMA is the commanding 3G innovation, giving higher ability to voice and information and higher information rates. The continuous development from the present frameworks is driven by interest for limit, which is required by new and quicker information based portable administrations. WCDMA empowers better utilization of accessible range and more cost-proficient system arrangements. The administrator can step by step develop from GSM to WCDMA, securing speculations by re-utilizing the GSM center system and 2G/2.5G administrations. TDMA with OFDM gives Dynamic designation of subcarriers. Protection from numerous blurring and expands the limit of the channel is better in OFDMA.

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Multiuser resource allocation schemes in CDMA2000/ UMTS.

The CDMA which is a code division multiple access, gives high data rate and content based data communication. In this multiuser technique the bandwidth is shared among the entire user and they are distinguished using the codes that were used in transmitting the data in wireless media.

CDMA utilization advantages are as below:

  • Spectral proficiency is improved
  • Handover is improved
  • Improved security

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Part B - The purpose of this part of the assignment is to motivate students to improve their coding and simulation skills.

Question 1: Amplitude Modulation (AM)

(a) Using Matlab, sketch the waveforms of m(t), u(t)=m(t)c(t) and v(t)=[1 + m(t)/Ac]*c(t) in one figure. Explain what you observe from the figures.

(b) Using Matlab sketch the spectra of m(t), u(t)=m(t)c(t) and v(t)=[1 + m(t)/Ac]*c(t) in one figure.

Answer - Coding and Simulation

a) Amplitude Modulation (AM) time domain MATLAB code

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 b) Spectra of AM in MATLAB

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Question 2: Huffman coding

(a) Write a MATLAB function 'entropy' to compute the entropy of the source.

(b) Use your function 'entropy' to find the entropy of the given source.

(c) Write a MATLAB program to generate a Huffman code for the source.

Answer - Huffman coding

a source with the seven symbols in its alphabet s = {'s0' 's1' 's2' 's3' 's4' 's5' 's6'} which has the probabilities p = [0.18 0.21 0.2 0.26 0.03 0.05 0.07].

MATLAB function 'entropy' to compute the entropy of the source

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MATLAB program to generate a Huffman code for the source.

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Conclusion

In this assignment we have studied and analyzed digital communication systems. The topics for this assignment includes multiuser communication and techniques for resource sharing, and MATLAB implementation of amplitude modulation and its spectrum. The report also includes Huffman coding implementation in MATLAB.

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