Question

A wireless communication system has a receiver sensitivity of -15 dBW. The loss due to distance is 12 dB. The gain of the transmitter and receiver antennas are 5dB and 3dB respectively. What is the required transmission power in dBW and in W?

Answer 1

SOLUTION:

From given data,

A wireless communication system has a receiver sensitivity of -15 dB W.  The loss due to distance is 12 dB. The gain of the transmitter and receiver antennas are 5 dB and 3 dB respectively.  What is the required transmission power in dB W and in W

given that,

receiver sensitivity = -15 dB W

= 15 dB m

receiver sensitivity (dB) = receiver sensitivity(dB m) - 30

= 15 dB m - 30

= -15 dB

Noice Margin = Received power - receiver sensitivity

Let us assume , Noice margin = 3dB

3 dB = Received power - (-15)

3 dB = Receive power + 15dB

3dB - 15 dB = Received power

Received power (dB) = transmitter power (dB) + Gain of transmitter antenna (dB) + Gain of receiver antenna (dB) - loss due to distance (dB)

-12 dB =  transmitter power (dB) + 5 dB + 3 dB - 12 dB

transmitter power (dB) = -8 dB

Transmitter power (dB m) = transmitter power (dB) + 30

= -8 dB + 30

= 22 dB m

Transmitter power (dB W) = -8 dB w

= 158 * 10 ^-3 W

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