10 questions
Q.1. (a) Explain the DSSS with binary phase shift keying and compare its performance with FHSS. [8]
(b) Write the properties of PN sequence. If the chip rate of a DSSS transmitter is 20Mbps, the message bit rate is 10 kbps. Find out the processing gain achieved, if BPSK is used. [2+6=8]
Q.1. (a) Explain FHSS with basic block diagram and find the expression for processing gain (Gp) in fast and slow systems. [8]
(b) Explain the properties of spreading codes. How are they generated? Briefly explain. [8]
Q.2. (a) Explain the transmitter and receiver block diagram of Microwave link. [8]
(b) Explain the concept of diffraction loss as a function of path difference around an obstruction by Fresnel zones. [8]
Q.2. (a) Explain small scale fading and write the time dispersion parameters. [8]
(b) Assume a receiver is 20 km from a 100W transmitter. The carrier frequency is 1000 MHz free space propagation is assumed, Gt=1 and Gr=3. Find the power at the receiver. [8]
Q.3. (a) Explain the TDMA principle of operation with TDMA/TDD example. Write its advantages and disadvantages and efficiency. Also, compare FDMA with TDMA. [8+2=10]
(b) If a normal GSM time slot consists of 6 trailing bits, 8.25 guard bits, 26 training bits and 2 traffic bursts of 61 bits of data, find the frame efficiency. [6]
Q.3. (a) Briefly explain the Near-Far problem in both uplink and downlink of CDMA. [6]
(b) Explain the CDMA principle of operation with its advantages and disadvantages. Which type of Handoffs occur in CDMA mobile systems? [10]
Q.4. (a) Explain the process of speech coding in GSM. [6]
(b) Define Handoff and Handovers in GSM. [6]
(c) Compare WiFi and WiMax Technology. [4]
Q.4. (a) Explain RFID Technology. [6]
(b) Explain briefly - (i) Bluetooth [5] (ii) Broadband wireless 1002.16 [5]
Q.5. Write short notes on the following - (a) Low Noise Amplifier [4] (b) Up converter [4] (c) Down converter [4] (d) Monitoring and control [4]
Q.5. (a) Explain the process of link design of a satellite system and derive an expression for the received power. [8]
(b) Define the following - (i) Coverage angle [2] (ii) Slant range [2] (iii) Orbital period [2] (iv) Orbital velocity [2]