STUPIDSID
1 (a)
Compare 2G, 3G and 4G with respect to speed, applications and bandwidth.
5 M
1 (b)
if 36 MHz total spectrum is allocated for a duplex wireless cellular System and simplex channel has 25 MHz RF bandwidth find Total number of duplex channels, Number of channels per cell if N=4 cell. reuse is used.
5 M
1 (c)
Explain concept and importance of power control in CDMA.
5 M
1 (d)
Explain fading effects due to Doppler spread.
5 M
2 (a)
If a signal interference ratio of 15 dB is required for satisfactory Forward channel performance of a cellular system, what is frequency Reuse factor and cluster size that should be used for maximum capacity if path loss exponent is 1) n=3 and 2) n=4. Assume six first tier co channel cells & mobile unit is at the center of cell.
10 M
2 (b)
Explain principle of Rake receiver in detail.
10 M
3 (a)
An urban area has population of two million residents. Three competing trunked mobile networks 1 systems A, B, C, provide cellular service in this area. System A has 394 cells with 19 channels each. System B has 98 cells with 57 channels each; and system C has 49 cells each with 100 channels. Find the number of users that can be supported at 2% blocking if each user averages two cells per hour at an average call duration of 3 minutes. Assuming that all three trunked systems are operating at maximum capacity, compute the percentage market penetration of each cellular service provider Data: GOS=0.02;
| Number of Channels | Total Traffic Intensity (Erianges) |
| 57 | 45 |
| 19 | 12 |
| 100 | 88 |
10 M
3 (b)
Explain W-CDMA Forward channel structure in detail.
10 M
4 (a)
Compare IS-95, WCDMA and CDMA 2000 with respect to channel bandwidth, chip rate, modulation schemes, data rates and frame size.
10 M
4 (b)
Draw LTE network architecture and discuss it in detail.
10 M
5 (a)
What is the concept of software defined radio? Elaborate in detail.
10 M
5 (b)
Explain Hand off in UMTS.
10 M
Write a short note on any two of the following:
6 (a)
Mult-iantenna Techniques.
10 M
6 (b)
Cellular capacity and coverage improvement Techniques.
10 M
6 (c)
Indoor propagation Models.
10 M
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