Wireless Networking · Unit 2
Modulation Techniques
Exam-focused notes for Modulation Techniques (Wireless Networking, BIT357): what the TU syllabus asks and how it has actually been tested, with 3 solved past questions from this unit.
What this unit covers
- Amplitude modulation
- Frequency modulation
- Phase modulation
- MSK and GMSK modulation
- DPSK modulation
- QAM modulation and working
- Pulse shaping techniques
- Raised cosine pulse
Amplitude modulation
What is modulation? Discuss the concepts of Amplitude Modulation, Frequency Modulation and Phase Modulation with example. [5]
Modulation is the process of varying one or more properties of a high-frequency carrier signal in accordance with a low-frequency information signal (message signal). It is essential for transmitting information over long distances through communication cha...
Full solved answer →MSK and GMSK modulation
When digital data need to be converted into analog signal? How MSK and GMSK converts digital data into analog signals? Demonstrate with example.[10]
Digital data must be converted to analog signals in the following scenarios: 1. Transmission over analog channels - Traditional telephone lines, radio frequency (RF) channels, and wireless media require continuous analog waveforms 2. Long-distance communica...
Full solved answer →Pulse shaping techniques
Why pulse shaping technique is used? Explain any one pulse shaping technique. [5]
Pulse shaping techniques are used for the following reasons: 1. Bandwidth Reduction: Pulse shaping reduces the bandwidth required for transmission by controlling the spectral characteristics of the signal. This allows more efficient use of the available fre...
Full solved answer →Make Unit 2 stick
Practice BIT357 with flashcards & quizzes