Wc.docx

12.(a)

Explain in briefly the Principle of CDMA with Capacity Calculation

(16)

Or 12.(b)

Explain in briefly about improving coverage capacity in cellular systems

(16)

13.(a)

Explain with neat diagram of OFDM Transmitter and Receiver

(16)

8th Semester Electronics and Communication Engineering

Duration: 3 hours

Date: -04-2017

Maximum marks: 100

Answer All Questions

Or

PART – A (10 x 2 = 20 marks) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

Define: Frequency Reuse State the difference between small and large scale fading. Mention a few techniques to expand the capacity of cellular networks? Mention the difference between wide and narrow band systems What is Link Budget Calculation? Why GMSK is preferred for multiuser, cellular communication? Differentiate selection diversity and combining diversity. Define: Diversity and its principle? Define: Transmitter and Receiver Diversity. Define: CSI.

Explain in detail about an indoor propagation models Explain in detail about fading due to multipath time delay spread

Explain in briefly about cyclic prefix and windowing. Explain in briefly about frequency and delay dispersion

(8) (8)

14.(a)(i) (ii)

Explain in detail about MMSE with neat block diagram Explain in detail about linear equalizer with neat block diagram

(8) (8)

Or 14.(b)

Explain in detail about Macro Diversity with neat block diagram

(16)

15.(a)(i)

Explain in detail about capacity in fading and non-fading channels Explain in briefly about Pre-coding

(12)

(ii)

PART – B (5 x 16 = 80 marks) 11.(a)(i) (ii)

13.(b)(i) (ii)

Or (10) (6)

15.(b) 16.(a)

Or 11.(b)(i) (ii)

Explain in detail about two ray propagation model with neat block diagram Explain in detail about fading due to doppler spread

(4)

(8) (8)

Explain in detail about Receiver diversity technique

Find the 3dB bandwidth of a Gaussian low pass filter used to produce 0.25 GMSK with a channel data rate of Rb = 270 kbps. What is the 90% power bandwidth in the RF channel? Specify the Gaussian filter parameter. Or

16.(b)

Briefly explain Peak Average Power Ratio(PAPR) in OFDM

(16)