# HW9 - Problem 1(Count as 2 problems Satellite TV...

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Problem 1 (Count as 2 problems) Satellite TV Transmission A signal is transmitted at 10 GHz ( meter 03 . 0 = λ ) from an orbit 30,000 km above the earth. The transmitter gain is 20 dB. In bad weather, the signal may suffer an absorption loss of 2 dB per km through thunderstorm rain 3 km depth. The receiver dish is 0.4 m in diameter. Account for the following losses and gains Distance loss = Transmitter gain plus receiver gain = Absorption loss by rain = Net loss = Assume thermal noise Hz W N / 10 4 21 0 - × = . We transmit HDTV at 10 Mbps at 100 W power. Calculate Received power ( W ) = : The energy per bit = The subsequent 0 / N E b = If we need dB N E b 10 / 0 , is the above 0 / N E b satisfactory? Suppose we use a rate ½ Hamming distance = 14 convolutional encoder. Calculate the coding gain. Is the result satisfactory now?

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Problem 2 Cellular communications Draw the cellular pattern for N =13 (with 1 , 3 = = j i ). Draw a pattern with 13 cells numbered, plus one more layer of cells (numbered also) surrounding the pattern. What is the signal to interference for this cellular system, assuming fade exponent
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HW9 - Problem 1(Count as 2 problems Satellite TV...

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