ENGD3106 Mobile Communication 2 Coursework Assignment 2021-2022
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ENGD3106 Mobile Communication 2
Coursework Assignment
2021-2022
Mobile Communication
Systems
Aim: In this assignment, you will use Matlab to simulate multiple-antenna communication systems, demonstrate an understanding of modulation techniques in 4G, and review the literature on 5G scenario and use cases.
What to submit: Your coursework must be submitted as a report in Word format to Turnitin. All Matlab scripts used must be included in an appendix at the end of the report. This includes all additional functions you have written as part of your code (if any). Your Matlab code must be well-commented and documented. All references must be in IEEE format. Please note that 4 marks will be allocated to the presentation and organisation of your report including the documentation ofyour Matlab code.
Part 1
1) Assume a single-input single-output (SISO) system operates at 2.6 GHz with a line- of-sight channel between the transmitter (Tx) and the receiver (Rx).
Write a Matlab script that simulates transmission of a randomly generated bitstream of 106 bits over an Additive white Gaussian noise (AWGN) channel using the three modulation techniques used in LTE-A (4G), i.e., QPSK, 16-QAM and 64-QAM. Plot and compare the bit error rate (BER) of these modulation techniques as a function of the energy per bit to noise power spectral density ratio (Eb/N0) for an AWGN channel. Discuss and analyse your results.
[10 marks]
2) Considering QPSK modulation only, demonstrate the array gain in multiple-antenna systems by comparing the BER of the SISO system in (1) with that of single-input multiple-output (SIMO), multiple-input single-output (MISO), and multiple-input multiple-output (MIMO) systems.
− Assume the Rx array in SIMO is a 4-element uniform linear array (ULA) with half-wavelength spacing
− Assume the Tx array in MISO is a 4-element ULA with half-wavelength spacing
− Assume a MIMO system with a 4-element ULA Tx array and a 4-element ULA Rx array all with half-wavelength spacing.
Discuss and analyse your results
[14 marks]
Part 2
For the International Mobile Telecommunications (IMT)-Advanced system, the International Telecommunication Union defines the propagation model for a non-line- of-sight urban macro-cell scenario with a base station antenna height of 30 m and a mobile antenna height of 1.5 m as:
= 32 log10() + 32.4 + 20 log10()
where L is the magnitude of the link attenuation in dB, r is the range in m, andfc is the carrier frequency in GHz.
Table 1 shows the link budget for the uplink on a mobile communication system operating on 2100 MHz.
1) Write a Matlab function that can calculate the cell radius based on a given link budget using the parameters in Table 1 as an input. Then, write a Matlab script that uses your function to calculate the cell radius using the values in Table 1.
Table 1: Link budget for an uplink
Link Budget (Uplink) |
Value |
Transmitter, terminal |
|
Maximum mobile transmission power [W] |
0.125 |
Antenna gain |
1 dBi |
Body loss |
-4 dB |
Receiver, Base Station |
|
Required Eb/N0 at base station decoder |
5 dB |
Fast fading margin |
-5 dB |
Log-normal fading margin |
-7.3 dB |
Antenna gain |
18 dBi |
Cable loss |
-2 dB |
User noise interference margin |
3 dB |
Processing gain (W /R) |
25 dB |
Thermal noise |
- 100.2 dBm |
[7 marks]
2) LTE-A (4G) systems use the three modulation techniques QPSK, 16QAM and 64QAM.
a. Research the literature to discuss the impact of using different modulation techniques on the cell coverage range when all other system setup parameters are the same.
b. Demonstrate that impact using the Matlab code in Part 2 1).
c. Briefly compare those modulation techniques to the ones used in 5G New Radio (NR) systems.
[7 marks]
Part 3
5G NR scenarios are classified as enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), and massive machine-type communications (mMTC). The rollout of 5G systems has globally started with eMBB. Research the literature to briefly describe the features and applications of URLLC and mMTC. Your answer needs to provide a discussion on the importance of each scenario and an analysis ofthe challenges that face their implementation/deployment.
(Maximum length 1000 words)
Your answer should be supported by recognised publications, preferably from IEEE, that are cited properly using the IEEE referencing style.
[8 marks]
2022-03-09
Mobile Communication Systems