Q1) Given an OFDM system with bandwidth 10 MHz and number of subcarriers N=1024. The cyclic prefix comprises of 1/8 of number of samples from the tail of the OFDM symbol prefixed in the front. 1- Calculate the total time of the resulting OFDM symbol with CP. =NTS+1/8(NTS) 2- If we use 16 QAM modulation find total data rate( ={N+L)*4}/total time

Problem 2 In a DSB-SC system, the carrier frequency is 5 kHz and the message signal is given by m(t) 2cos1000nt + sin2000nt. Find and sketch the spectra of the message signal and modulated signal. Identify the upper sideband (USB) and the lower sideband (LSB) spectra in the DSB-SC modulated signal. Determine the average power in the message signal as well as in each frequency component of the modulated signal. Problem 3 The modulating signal m(t) = cos1000nt cos3000nt is multiplied by the carrier c(t) = cos(2nfct), where f. = 5 kHz. Determine and sketch the spectra of the modulating and modulated signals. Identify the upper sideband (USB) and the lower sideband (LSB) spectra in the DSB-SC modulated signal.

2. In FDM, if there are 8 input signals each requiring a bandwidth of 3 MHz, what is the minimum bandwidth required for the combined signal?

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