FORM B LO2 20. In relation to the Preamble in OFDM systems a. The required Pream
ID: 2293817 • Letter: F
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FORM B LO2 20. In relation to the Preamble in OFDM systems a. The required Preamble (in seconds) is larger when the coherence time is larger b. The required Preamble (in seconds) is smaller when the coherence time is larger c. The required Preamble (in seconds) does not depend on the coherence time value d. All of the above is correct. e. None of the above is correct. 21. An Engineer working at wireless operator Vodo proposed to add MIMO-SDMA as the Multiple Access Technology together with CDMA for 3G. Choose the correct option from below for such proposal a. His proposal will increase the delay. b. His proposal will increase the data rate. c. His proposal will increase the number of serviced users. d. Both a. and c. are correct. e. Both b. and c. are correct. f. Both a. and b. are correct. B. All of the above is correct. h. None of the above is correct 22. In relation to the Cyclic Prefix in OFDM, choose the correct option from below a. It enables synchronization among the subcarriers. b. It enables guard band between two operators to be the least possible. c. It removes the interference to other systems (operators) d. It enables the channel estimation at the receiver side. e. Both b, and c, are correct. f. Both b. and d. are correct. &. Both a. and d. are correct. h. All of the above is correct None of the above is correct. 23. The discontinuous nature of TDMA systems facilitates the handover process because a. The base stations will have more frequencies to allocate users. b. The coverage of TDMA is very large, making the probability of handover to be low c. 2G also transmits SMS, not only voice d. The Base station will make the handover in the time slots that a user is not transmitting over them e. All of the above is correct. f. None of the above is correct.Explanation / Answer
20 ) in ofdm systems is required premeable is smaller when coherence time is larger
21) it increases delay, datarate and service usres
22) it enables channel receiver receiver side, and guard band between two operators least possibles (and option h also)
23) the base station will make the handover in time slot that a user is not transmiter over them
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