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estion 4-(30 pts) you want to transmit R = 4800 bits/sec information stream from a transmission channel which la bandwidth of 15 kHz. You are allowed to use Nyquist criterion pulses with roll-off factor r = 0 a suitable modulation (M-PSK, MFSK (orthogonal, non-coherent MFSK)). a) (3 pts) Which modulation either MPSK, or MFSK, is suitable for this transmission. Why? (b) (4 pts) Determine the best value of M which minimizes the Eb/No at the receiver? (c) (8 pts) If the carrier frequencies of the MFSK are represented for f1 fm-1 and fo = 2 kHz, determine J₁ J₂ JM-1 and sketch the spectrum of the transmitted MFSK signal. Indicate all the important frequencies (minimum frequency, maximum frequency, for fi,fM-1). (d) (15 pts) The following model for path loss as a function of distance is commonly used for system design. P₁ = P. (da) Pt ere P is the transmitted signal power, Pr is the received signal power, do is the reference distance ch is commonly selected as 1 meter, d is the distance between transmitter and receiver (in ters), and y is the path loss exponent (You can assume y = 2). the path loss model, assuming No = 10W/Hz and d = 10 meters, for the above MFSK In what should be the value of P, (in dB) so that the BER at the receiver is P = 10-5.