Question

Qodopere -Model -Dodst C Be) o 5 10 (Ms) microsecond a) For the wireless channel whose power-delay profile is given in Figure, calculate RMS delay spread or ? b) Estimate the coherence bandwidths for 90% correlation and 50% correlation? CHint: Beach for 90% , B= for %) © For the following scenarios, determine if the received signal is best described as undergoing fast fading, flat fading or frequency selective fading ? a) A binary modulation has a data rate of soo kbps, fc: 1 GHe and a typical urban radio channel is used.' (Hint: RMS dely spread = 2 M second for urban env.) b) A binary modulation has a data rate of 10 bps fo=1GH? and a typical urban radio channel is used. (Oyo 2 sec.) For both part (a) and (b) assume mobile user is moving at a speed of 100 km/hr.

Answer 1

Solution 0 a. Ook -- - - 7 -lods odBt. علی oto > VHS) RMS delay spread of 22 -1712 T-Mean excess delay = & & K & R K . 1080)+1645+(6x+0) 100 + 10 + 10° 2 91 459 HS ll

quz- & our & P(PK) 1² E P (TK) - 10² (0)² + 10 5 + 10 + 10² 10²+10 +10° 0+2 5+100 = - 102.5 (lill T . 92:342 MS On = {(92.342) - (9.459 2. Og i 1.694 MS Bcc I for 90% correlation 50 sf 6 BC = 11.866kHZ 50 X1694 Bc = 50 for 50% correlation 500 BC = 118,063 KHZ 5x11fqyt

quz- & our & P(PK) 1² E P (TK) - 10² (0)² + 10 5 + 10 + 10² 10²+10 +10° 0+2 5+100 = - 102.5 (lill T . 92:342 MS On = {(92.342) - (9.459 2. Og i 1.694 MS Bcc I for 90% correlation 50 sf 6 BC = 11.866kHZ 50 X1694 Bc = 50 for 50% correlation 500 BC = 118,063 KHZ 5x11fqyt