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Question 1 In 802.11a, if the channel conditions are very bad (the signal to noise ratio (SNR) is low) we are going to use the FEC code with the code rate vie 172 2/3 None of the listed 5/6 3/4 Question 2 If the channel gain matrix H, in a 2x2 MIMO system is given by 0.5 1 can we have two spatial stream for data transmission? It depends Yes vie No Question 3 What is the symbol rate in 802.11n in 40MHz of BW with long GI? 30 Msymbols per sec 12 Msymbols per o 27 Msymbols per sec 13 Msymbols per sec Question 4 In 802.11a, if the channel conditions are good (the signal to noise ratio (SNR) is high) we are going to use the FEC code with the code rate 5/6 2/3 1/2 vie 3/4

Question 5 You can assume that, if the 802.11n operates in Single Input and Single Output (SISO) configuration with 16-QAM and code rate 3/4 using long GI, the data rate is 39Mbps. What is the data rate of this system when 802.11n operates in 3x3 MIMO setup? 260 Mbps 130 Mbps 300 Mbps e 117 Mbps 32.5 Mbps 78 Mbps Question 6 What is the bit rate (in Mbps) for 802.11ac in the following configuration: a) short Gl; 16-QAM; code rate 2/3; b) channel bonding with 40MHz of BW c) 4x4 MIMO setup Choose the closest in Mbps Hint: Please observe that this configuration is not in the lookup tables and you have to perform calculations based on your understanding of the WiFi systems = 320 144.4 154 % (@ None of the listed 160 300 270 180 600

Question 7 In "newer" versions of ADSL modems something like in those given by ITU G.992.5 Annex M, the upstream bandwidth is proposed to be the range from 25kHz to 281kHz resulting in 64 subcarriers, each of 4kHz bandwidth. Assuming that ADSL does not use guard intervals and all subcarriers are used for data transmission, and assuming that we can have all possible combinations of modulation schemes from 4, 16, 64,256 QAM and FEC with code rates %, %, and 5/6 what is the highest bit rate you can transmit in this system on the upstream: (choose the closest) v e 1.706 Mbps 1.024 Mbps 256 Mbps 2.048 Mbps 8 Mbps Question 8 What is the symbol rate in 802.11n with short Gl on one subcarrier in 312.5kHz of bandwidth? 14.4444 Msymbols per sec 250 ksymbols per sec e 277.7777 ksymbols per sec 13 Msymbols per sec Question 9 The center frequency of channel 1 in the 2.4 GHz band is 2.412 GHz (2412 MHz). What is the center frequency of channel 4? 2.413 GHz 2.437 GHz 2.417 GHz None of the listed 2.422 GHz (e 2427 GHz

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Question 10 What is the bit rate in 802.11ac in the following configuration: a) long Gl; 256-QAM, code rate 3/4 b) no channel bonding so 20MHz of BW c) 8x8 MIMO setup 1404 Mbps 693.3 Mbps 260 Mbps 312 Mbps (o) 624 Mbps 346.7 Mbps Question 11 Can we say that 256-QAM is better than 4-PSK? o) It depends No Yes Question 12 Part 1) The required SNR to get BER=10%(-4) in 4096-QAM is 37dB. What is the closest corresponding SNR on the linear scale? Part 2) To get BER=10%(-5) in 16-QAM the required SNR on linear scale is 20. What is the closest corresponding SNR on the dB scale? 1) 20000 2)17dB 1) 7000 2)17dB s 1) 5000 2)13dB 1) 2000 2)13dB 1) 10000 2)13dB

Question 13 G.hn defines the OFDM usage for power line communications. In one of its configurations (Option 3) on acceptable electric wires, the modem can use OFDM in the following setup: i) 2048 QAM on each sub-carrier; ii) sub-carrier spacing of 12kHz; iii) there is no guard interval so the symbol rate on each sub-carrier is 12ksps; iv) 4096 sub-carriers on one pair of wires; v) the FEC code rate is: 20/21; vi) on power lines with 3 wires (one of them being ground), in the configuration considered in this problem we have the advantage of MIMO where there are two spatial streams accomplished as two parallel transmissions - one spatial stream over one wire with respect to the ground and the second spatial stream over second wire with respect to the ground. What is the bit rate at which you can send data over power line with modem in the above setup: (Choose the closest) 3 Gbps e 1029.8 Mbps 514.9 Mbps 468 Mbps None of the listed 540.6 Mbps 280 Mbps Question 14 Can 802.11a or g use 40 MHz of bandwidth (two bonded 20MHz channels? True v (o False Question 15 Can 802.11ac (or equivalently VHT) connection use 80MHz of bandwidth (four bonded channels of 20MHz)? v (o True False

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