Please answer d, e, f, and g 3.) Consider a wireless communications system with
ID: 2291032 • Letter: P
Question
Please answer d, e, f, and g
3.) Consider a wireless communications system with the following parameters Transmitter Power: 20 dBm Transmitter Cable Loss: 2 dB (Important hint: don't forget this) Minimum required received power: -102 dBm Transmitter Antenna Gain: 10 dBd Receiving Antenna Gain: 0 dBi Carrier Frequency: 1 GHz Hint: Draw a link budget picture here (doing this will really help you get partial credit and to get the problem right). a. Calculate the ERP and EIRP of the transmitted signal (dBm) (don't forget the cable loss). b. Calculate the range (the distance over which the wireless system will work in free space). c. Assume a signal propagates over an ideal flat surface. Compute the range for a transmitting antenna height of 13 meters, and a receiving antenna height of 1 meter, assuming the reflection with partial cancellation model. Use the parameters at the beginning of the problem. d. Assume log-normal shadowing in addition to attenuation. Using the propagation model used in part c, assume that you wish to have the required signal level (-102 dBm) with 90& confidence at the cell edge, what is the mean signal strength required at the receiver if the shadowing standard deviation is 8 dB? e. Recalculate the range using the model if in addition to the margin in part d you needed to include and additional 10 dB building penetration, and 6 dB indoor shadowing margin? f. Calculate the free space power flux density (W/m2) at the range you calculated in part b. g. Calculate the electric field density (V/m) using the flux density from part f.Explanation / Answer
answer:
a) EIRP=PT-LC+Ga
here
PT=transmitted power, LC= cable loss, Ga = gain of transmitting antena
EIRP =20dbm-2db+10db = 28dBw,
ERP=PT-LC+Ga-2.15,
=20dB-2dB+10dB-2.15 = 25.85dBw.
......................................................................................................................................................................