# A wireless system using BPSK modulation operates with a bit error probability 10-6 . The…

A wireless system using BPSK modulation operates with a bit
error probability 10_6 . The contribution of the atmospheric noise
temperature to a BS antenna noise is about 70100 K at 900 MHz, and man-made
noise contributes another 10120 K depending on the area (rural or urban). The
BS antenna noise temperature TA is thus in the range of 100200 K. The receiver
noise figure is assumed to be 10 dB.

a. Assuming a BS antenna noise temperature of 200 K,
determine the required received bit energy Eb in dB. How this result would be
affected if the antenna noise temperature were 100 K?

b.

A wireless system using BPSK modulation operates with a bit
error probability 10_6 . The contribution of the atmospheric noise
temperature to a BS antenna noise is about 70100 K at 900 MHz, and man-made
noise contributes another 10120 K depending on the area (rural or urban). The
BS antenna noise temperature TA is thus in the range of 100200 K. The receiver
noise figure is assumed to be 10 dB.

a. Assuming a BS antenna noise temperature of 200 K,
determine the required received bit energy Eb in dB. How this result would be
affected if the antenna noise temperature were 100 K?

b. Assuming that the maximum required bit rate is 171 kbps
and a 3 dB implementation loss, determine the minimum power level required by a
receiving BS antenna in dBm.

c. Assuming that the gains of MS and BS antennas are 2.15
dBi and 15 dBi and the range is 20 km, determine the minimum required transmit
power by a MS so as to establish a link between MS and BS in a wireless system
operating at 900 MHz. Hint: Assume free-space propagation conditions

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