Question

(a) Under the free-space path-loss model, find the transmit power required to obtain a received power of 10dBm for a wireless system with isotropic antennas (Gl = 1) and a carrier frequency f = 5GHz, assuming a distance d = 10m.

(b) Show that, under free-space path-loss model, doubling the distance attenuates the power received by approximately 6dB.

Answer 1

PL Gr Gr Received power (Po) (4 od go GK = Gya! da ulah 8 8 No sxiol 0.06 2 /4T1d Transmitted powed Pro Pt Gt Go Pra lodom 20 dB 20dB Po 2 lolog Po 0.01 4T). 10 0.01 Pt 0.06 3 bel PE - 43.864 X10 Pk = 46.42 dB when d = axlom 2om 43.864x10x1 xial Po 4T X20 6-06 Po ł 0.596 to 2.500mw Pro - 26.02 dB pr (-20- 6 dB 6 dB Attenuates signed by in distance d is doubled when