3.
Use of same frequency channel for same time slot Low symbol rate and guard interval 3. c. Full duplex mode 3. e. Both a and c, a. Transversal filter b. Vocoders 4. e. Both b and c are correct, 142) The advantage of using SDMA over other spread spectrum technique is, a. d. Both a and b Frequency of the incident wave, a. The field of Cellular Mobile Communications (CMC) is highly emerging. Different users in different time slots Use of spatial locations of mobile units within the cell Half duplex mode d. All of the above, 51) Interference in cellular systems is caused by, a. Low spectral efficiency d. Forward channel, a. Wireless concept of making calls Unobstructed line of sight between the transmitter and receiver Interference rejection capability c. Mobility In Network
d. Estimation of transmitted signal, demodulation, bit decision, correlator, ANSWER: Correlator, estimation of transmitted signal, demodulation, bit decision, 97) Search window of a RAKE receiver is, a.
c. Multiplexed signals d. Each signal is modulated with frequency modulation technique, ANSWER: Different users in different time slots, 123) In TDMA, the user occupies the whole bandwidth during transmission, a.
b. 1 and 3 are correct Frequency allotted 35) In a dynamic channel assignment strategy, a. d. High speed users with large coverage area, ANSWER: Ability of a user to access trunked system during busy hour, a. Erlangs /MHz /km2
3. d. Multiple users with coding techniques, a. Wide band digital communication
d. All of the above, a. Transmitter d. All of the above, 58) Distributed antenna systems are used at, a. Transmitters of mobile systems When mobile station moves between two cellular systems c. Channel that passes all spectral components with linear phase d. 2 and 3 are correct, 63) When a wave falls on a perfect conductor, a. 2. Noise developed at the receiver Suitable for noisy environments, 103) The type of frequency domain coding that divides the speech signal into sub bands is, a. Waveform coding Random frequency modulation d. All four are correct, 1. c. Un availability of the channel Frequency diversity 4. Polarization diversity, a.
24) In TD-SDMA, there is a frame of _____milliseconds and the frame is divided into _____ time slots. b. d. All are correct, 61) The rainbow pattern seen on a CD is an example of, a. 1, 2 and 3 are correct
c. Voice message 2. b. 3. c. Each user is assigned a unique code sequence b. CDMA c. Digital European Cordless Telephone Temporary failure of message transfer, a.
Direct RF pulse system Cross talk c. 2 and 3 are correct 3. d. All of the above, 36) Advantage of using Dynamic channel assignment is, a. c. Both a & b 3. d. Both a and b
c. 2 and 4 are correct Obstacles b. c. Signal to noise ratio c. Blocked calls c. Using different antennas d. Both a and b Different phase, 152) The effects of small scale multipath propagation are, 1. d. All of the above, a. 2. Linear filters c. Hybrid access protocol Different amplitudes 3. c. 2 and 3 are correct d. All of the above, a. TDMA c. Is used for high speed users with large coverage area and low speed users with small coverage area b. Hopping rate greater than or equal to information symbol rate b. 1 and 2 are correct Wave is partially reflected and partially transmitted d. None of the above, a. Calculations and analysis is increased 3. Mobile Identification Number 3. c. Both a & b Time synchronization problems d. All of the above, 101) Speech coding technique that is independent of the source is, a. Vocoders Type of modulation technique used c. Coverage zone approach Multiple users on single channel c. Transceiver d. All of the above, ANSWER: Multiple versions of signals are transmitted at different time instants, 1.
d. All the four are correct, 78) Direct sequence spread spectrum demodulation uses, a. a. The traffic carried by whole network Fading due to large obstructions d. None of the above, 102) Advantage of using waveform coders is, 1. d. All of the above, ANSWER: Focusing radio energy towards ground, 60) Diffraction, at high frequencies, depends upon, 1. ISI is lesser, a. 1 and 2 are correct d. Frequency non selective fading, 149) The power delay profile helps in determining, a.
Pitch detection is not required, a.
2.
c. Excess delay spread d. All four are correct, 122) TDMA is a multiple access technique that has, a. b. b. Vocoders c. Spectrum At ElectronicsPost.com I pursue my love for teaching. 3. c. Regular
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