Concepts of Wireless Networking 2073
Attempt all questions:
1. Discuss about the difficulty of wireless communication network. Write the features of 3rd generation wireless communication network.(4+2)
2. Find the median path loss using Okumura's model for d = 50km, the = 100m, hre = 10m in a suburdan environment. If the base station transmitter an EIRP of 1KW at a carrier frequency of 900MHt. Find the power at the receiver (assume a unity gain receiving antenna).(6)
3. The transmitted signal is given by:
g(t) = e-ut, 0 ≤ t ≤ T
where T is the symbol interval. The signal is corrupted by additive white Gaussian noise with zero mean and two-sided power spectral density none wat / Hz. The optimum detector is the matched filter.
a) Find the sketch impulse response of the filter which is matched to the original g(t).
b) Derive the output of the filter.(3+3)
4. What is modulation? Discuss the advantage and disadvantage of QPSK.(2 + 2 + 2 )
5. Consider a cellular system in which there are total of 1001 radio channels available for handling traffic. Suppose the area of a cell is 6 km2 and the area of the area of the entire system is 2100km2.
a) Calculate the system capacity if the cluster size is 7.
b) How many times would the cluster of size 4 have to be replicated in order to approximately cover the entire cellular area?
c) Calculate the system capacity if the cluster size is 4.(2 + 2 + 2)
6. What is interference? Write the type of interference in cellular system. Derive the expression for frequency reuse ration in terms of signal to interference ratio.(1 + 2 + 3)
7.What is CDMA? Write the advantage and disadvantage of CDMA over DMA and FDMA techniques.(2+2+2)
8. Write the steps of handoff procedure in intraswitch Handoff Design. Explain with suitable signaling sequence diagram.(6)
9. Write and discuss about the Ad-Hoc Routing protocols. Write the application of Ad-Hoc Network.(2+2+2)
10. Write short notes on(any two):(2x3)
a) Hard and soft Handoff
b) IP-based Network
c) OFDM transmitter and receiver block diagram
s) EIRP