Hey everyone, i am trying to get my assignment done. However i have some difficulties in doing so.
The question is:
Imagine you are trying to choose a good location in which to place a WiFi router in a house. In this section you will analyse the signal path from the router to another location and the effects suffered by the signal during its propagation (noise, attenuation, etc). For each student, the location of the WiFi router (start location), WiFi receiver (finish location), and the path followed by the signal are specified in the table below.
The maximum signal power that a router transmitter can produce is 100mW. Assume that the average in-band noise power the WiFi receiver antenna picks up is -80dBm. The WiFi receiver has an antenna that provides a gain of 3dB and subsequently an amplifier that
provides gain of 20 dB. The amplifier adds -90 dBm of noise power due to the noise from the electronics. You may then assume the rest of the receiver is ideal and its performance is
determined by Shannon’s Theorem. With this information you are required to:
1. Calculate the signal level at the antenna of the receiver.
--------------------------------------------------------------------------------------Useful information:
A WiFi channel has a bandwidth of 22 MHz. The signal strength lost by a 2.4 GHz radio
signal can be given by the free-space loss equation. For the purposes of this assignment, you
may assume that the free space loss corresponds to:
Loss = 100d ^2 (d = distance in metres)
So if you start with 100 mW, at 10 metres, you have a loss of 10,000. So power at that point
is 100mW/10,000 = 10uW.
Signals passing through a vertical wall incur a 6dB loss of strength. Signals passing through
a ceiling or exterior wall incur a loss of 12 dB.
-------------------------------------------------------------------------------------
I have been given two internal walls and the distance between RX and TX is 9 meters.I have attached my rough diagram of how i understand it, however would appreciate some more help if you think i am going the wrong direction. Cheers!
The question is:
Imagine you are trying to choose a good location in which to place a WiFi router in a house. In this section you will analyse the signal path from the router to another location and the effects suffered by the signal during its propagation (noise, attenuation, etc). For each student, the location of the WiFi router (start location), WiFi receiver (finish location), and the path followed by the signal are specified in the table below.
The maximum signal power that a router transmitter can produce is 100mW. Assume that the average in-band noise power the WiFi receiver antenna picks up is -80dBm. The WiFi receiver has an antenna that provides a gain of 3dB and subsequently an amplifier that
provides gain of 20 dB. The amplifier adds -90 dBm of noise power due to the noise from the electronics. You may then assume the rest of the receiver is ideal and its performance is
determined by Shannon’s Theorem. With this information you are required to:
1. Calculate the signal level at the antenna of the receiver.
--------------------------------------------------------------------------------------Useful information:
A WiFi channel has a bandwidth of 22 MHz. The signal strength lost by a 2.4 GHz radio
signal can be given by the free-space loss equation. For the purposes of this assignment, you
may assume that the free space loss corresponds to:
Loss = 100d ^2 (d = distance in metres)
So if you start with 100 mW, at 10 metres, you have a loss of 10,000. So power at that point
is 100mW/10,000 = 10uW.
Signals passing through a vertical wall incur a 6dB loss of strength. Signals passing through
a ceiling or exterior wall incur a loss of 12 dB.
-------------------------------------------------------------------------------------
I have been given two internal walls and the distance between RX and TX is 9 meters.I have attached my rough diagram of how i understand it, however would appreciate some more help if you think i am going the wrong direction. Cheers!
Attachments:
I think it may help you here.http://www.electronicdesign.com/communications/understanding-wireless-range-calculations
