## Tuesday, November 13, 2012

### EC2301 Digital Communication Important Questions Nov/Dec 2012

Anna University, Chennai Nov/Dec 2012 Examinations

Rejinpaul.com Important Questions
EC 2301 - Digital Communication
Common To V Sem ECE
Unit I-V
1.       Briefly discuss about the types of analog pulse communication system with diagram
2.      Compare the bit error probability due to coherent ASK,PSK and FSK systems.Compare the performance of these systems
3.       Draw the neat block diagram of a typical DC system
4.      Explain the mathematical model and classification of communication channel
5.      Draw the block diagram of DPCM scheme and explain the principles in detail.
6.      State the Nyquist sampling theorem (problem: to check validity for an analog signal)
7.       Explain in detail about LPC and SBC
8.      Give the block diagram for the generation and detection of BFSK signal and explain in detail
9.    Explain in detail about DPCM and Derive the predictor gain
10.   explain in detail about viterbi decoding algorithm
11.   Derive power spectra of polar codes and on-off codes. Discuss the features in detail
12.   Define syndrome.(Problem: syndrome calculator for some cyclic code with diagram)
13.   Obtain the expression for Nyquist criteria for distortionless baseband transmission for zero ISI
14.   Derive bit error probability (they may ask any)
15.   Explain in detail about generation and detection of BPSK signal
16.   Derive the error probabilty for  non coherent detection of  ASK system

### EC2314 Digital Signal Processing Important Questions For Anna University Nov/Dec 2012 Questions

Anna University, Chennai Nov/Dec 2012 Examinations
Rejinpaul.com Important Questions
EC2314 - Digital Signal Processing
V Sem EEE
Unit I-V
1.       Explain in detail about analog to digital conversion with suitable block diagram and explain
the sampling  theorem
2.      Describe in detail the process of sampling and quantization. Also determine the expression for Quantization step
3.       Check for the following systems are linear, causal, time invariant, stable, static
(i)                y(n) = sin(x(n))
(ii)              Y (n)= x(n)+n x(n+1)
(iii)            y(n) = x(n) cos(x(n))
(iv)            y(n) = x(n) + nx(n+2)
4.      Check whether the following are energy or power signals
X( n) =(1/2)n  u(n)
X (n) =A e jÏ‰on
5.      Explain the properties of Z- Transform
6.      Find the impulse response(see Problems)
7.       Test the stability of given systems(see Problems)
8.      Find the convolution(see problems)
9.      Determine DFT of the sequence(see problems)
10.   From the first principles obtain the signal flow graph for computing 8-point DFT using radix2 Decimation in frequency FFT algorithm
11.   Determine the response of LTI system  when the input sequence
x(n)={-1,1,2,1,-1}  using radix2 DIF FFT. The impulse response is h (n) = {-1, 1,-1, 1}
12.   Realize the following using cascade and parallel forms
H (z) =    3+3.6Z-1+0.6Z-2
1+0.1Z-1-0.2Z-2
13.           Using Hanning window, design a filter(see problem)
14.           Using Rectangular window, design a filter(see problem)
15.           Discuss in detail about invariant method and Bilinear Transformation method
16.           Explain in detail the architectural features of a DSP Processor TMS320C54
17.            With a neat diagram explain Von- Neumann architecture.
18.           Explain the addressing formats and functional units of a DSP processor