Media - Digital Encoding Techniques - ASK Technique - Frequency - Science Assessment Answer

Assessment Details:

Task1

1.Explain the limitations of the following transmission media:

• Infrared
• Radio

2.Compare NRZ-L and NRZ-I digital to digital encoding techniques based on:

• representation of bits 0 and 1.
• synchronization capabilities.

3. Explain the synchronization problem associated with unipolar encoding. How such a problem is avoided using Manchester Bi-phase encoding.
4.Compare NRZ-L and NRZ-I digital to digital encoding techniques based on:
a.Representation of bits 0 and 1.
b.Synchronization capabilities.
4.Explain the advantages of PSK digital to analog modulation over the ASK technique

Task2

1. Explain the relationship between a signal period and a signal frequency.
2. Draw a sine wave with a frequency = 9 Hz.
3.Draw sine waves with phases = π/4, π/2 and π.
4. Consider a digital channel for transmitting voice data. Assuming a bandwidth of 2800 Hz, what is the channel capacity if voice data is encoded using 8 discrete values.
5. If the bandwidth of a communication channel is 1 MHz and the channels, SNR is 200. Assuming that Shannon’s theoretical channel capacity can be achieved, what is the number of signal levels required?
6. Explain the different types of noise sources discussing their effect on transmitted data signals.

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