B.TECH - Semester 6 digital communication Question Paper 2019 (jun)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- What is source encoding? How it can be performed?
- What are the reasons for aliasing effect? Give the solutions for the same,
- Give the characteristics of optimum linear filter.
- Show that the energy of a signal $s_{i}(t)$ is equal to the squared length of the signal vector $s_{i}(t)$.
- What is a likelihood function? Discuss briefly.
- Derive the expression for M-ary QAM modulated signal.
- Briefly describe about Code Excited LPC for wireless communication.
- What are the properties of Gold Codes makes it suitable for Spread Spectrum communication?
- Why multiple access Techniques are important for a wireless system? Describe about different types Multiple Access methods.
- Discuss about the quantization noise. How this noise can be minimized? Answer any two questions from each Module. Each question carries 10 marks.
- Give coder and decoder for realizing the DPCM. Discuss the working in brief. 10
- Prove the matched filter impulse response $h_{\text {opt }}(t)=k g(T-t)$. 10
- Derive the condition for Nyquist criterion for zero ISI for baseband binary transmission. 10
- With the help of necessary examples, explain Gram-Schmidt orthogonalization procedures.
- Give the block diagram for a correlation receiver with signal transmission decoder unit. Discuss the working principle of each block.
- Draw the block diagram for Coherent FSK coder and decoder and explain the working of the same.
- Derive the expression for the Processing Gain(PG) for DSSS with the signal $x(t)$.
- How the FHSS has classified? Briefly discuss about each type
- Why diversity techniques are adopted in wireless communication. Briefly discuss about different types of diversity techniques.