Reference no: EM132959695
ME502 Overview of Digital Communication - Melbourne Institute of Technology
Learning Outcome 1: Apply and evaluate the principles used in the generation, transmission and reception of digitally modulated signals;
Learning Outcome 2: Report on the characteristics of sampling and analogue to digital conversion and source coding;
Learning Outcome 3: Distinguish the digital modulation and demodulation techniques, channel coding and decoding and their performance;
Learning Outcome 4: Evaluate multiuser communication and resource sharing techniques;
Assignment Description:
The purpose of this assignment is to motivate students to seek application of waveform coding techniques for digital audio transmission and digital audio recording. The assignment has two parts: Part A and Part B.
PART A (formative): Literature Review and Implementation of Analogue to Digital converter (ADC) in MATLAB
Most modern communications systems operate in the digital domain for various reasons. However, most practical signals handled by these systems are naturally analogue in nature. Thus, an interface is needed between the signals and the systems handling them. This interface is called analogue-to-digital converter (ADC) and it's reciprocal, digital-to analogue converter (DAC). The three main functions of the ADC are sampling, quantization and encoding.
Q.1. Do a literature survey, identify types of Analog-to-Digital converters (ADCs) and rate them based on their coarse quantization noise power removal from the band of interest.
Q. 2. Implement at the least three types of analog-to-digital converters (ADCs) in MATLAB and show their responses with respect to the signal-to-quantization noise ratio.
PART B: Source Coding in Digital Audio Systems and Modulation
Q.1
An audio signal has a bandwidth of 20 kHz. This signal is to be sampled, quantised and binary encoded to obtain a signal to be transmitted over a communication channel.
a) Determine the sampling rate of this signal if it is to be sampled at 10% higher than the Nyquist rate.
b) If this signal is then quantised to 65,536 levels, determine:
I. The number of bits required to encode each sample of the signal.
II. The bit rate of the encoded audio data (bits/second).
c) Determine the minimum (theoretical) channel bandwidth required to transmit this information as
I. PAM encoded data
II. PCM encoded data
Q.2 The digital modulation system shown in Figure 1 uses symbols that are baseband encoded using a full- width polar signalling scheme. The bit rate being output by the data source is 3 Mbits per second.
figure 1
a) Find the bandwidth of the modulated signal output assuming the modulation scheme used is PSK modulation.
b) Find the bandwidth of the modulated signal output if the modulation scheme used is binary FSK modulation with: fc1 - fc2 = 250KHz.
Attachment:- Overview of Digital Communication.rar