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QUESTION 4 4G/LTE licensed bands currently allocated by NCA in Ghana include MTN and Vodafone (VF) on 800 MHz (Band 20), Surfline and Goldkey - 2600 MHz (Band 7), Busy - 4G/TD-LTE 2300 (Band 40), Blu Telecom - 4G/TD-LTE 2600 (Band 38) among others. Suppose you are designing a discriminating system components for a 4G/LTE modem. Test each of the following LTI systems whose impulse response h is given below by finding and plotting the frequency response H of the system, and identify the type of frequency-selective component to which the system corresponds. (a) h(t) = wc /t sinc Wet, where wc is a positive real constant. (5 marks) (b) h(t) = 8 (t) wc /t sinc wc t, where wc is a positive real constant. 15 marks (c) h(t) = 2wb /T (sinc wbt) cos wat, where wa and wb are positive real constants. [5 marks] (d) If VF has a 5MHz spectrum in the third block, which of the systems above will you use to select the network and plot the response in the Uplink. [Band 20 Uplink is 832 862 MHz in blocks of 5MHz, which means block 1 is 832 832 MHz and so on). [5 marks] QUESTION 4 4G/LTE licensed bands currently allocated by NCA in Ghana include MTN and Vodafone (VF) on 800 MHz (Band 20), Surfline and Goldkey - 2600 MHz (Band 7), Busy - 4G/TD-LTE 2300 (Band 40), Blu Telecom - 4G/TD-LTE 2600 (Band 38) among others. Suppose you are designing a discriminating system components for a 4G/LTE modem. Test each of the following LTI systems whose impulse response h is given below by finding and plotting the frequency response H of the system, and identify the type of frequency-selective component to which the system corresponds. (a) h(t) = wc /t sinc Wet, where wc is a positive real constant. (5 marks) (b) h(t) = 8 (t) wc /t sinc wc t, where wc is a positive real constant. 15 marks (c) h(t) = 2wb /T (sinc wbt) cos wat, where wa and wb are positive real constants. [5 marks] (d) If VF has a 5MHz spectrum in the third block, which of the systems above will you use to select the network and plot the response in the Uplink. [Band 20 Uplink is 832 862 MHz in blocks of 5MHz, which means block 1 is 832 832 MHz and so on). [5 marks]