Lecture6

Lecture6 - e = e A t t T G kB R P G SNR 2 2 ) 4 ( Te was...

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EE475 DR. Kirkman Lecture 5 USC 1 Wireless Communications Technology Link Budget Dr. George Kirkman EE475 Fall 2006
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EE475 DR. Kirkman Lecture 5 USC 2 Communications Link Carrier power Noise Information TX RX TX RX repeater
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EE475 DR. Kirkman Lecture 5 USC 3 Carrier power Friis equation C R G P G P r t t r = = 2 2 ) 4 ( π λ r G L EIRP C + - = In dB 2 2 ) 4 ( 10 S Log L =
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EE475 DR. Kirkman Lecture 5 USC 4 Carrier to noise T G L EIRP T C r + - = dBW/K B T C N C B k T C N C kTB C N C log 10 6 . 228 log 10 log 10 - + = - - = = dBHz B in Hz UNITS …
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EE475 DR. Kirkman Lecture 5 USC 5 More about G on T Receiver G/T should include the noise temperature of the components in the RX. For a DBS system low noise amplifier and mixer are at the antenna Called LNB or low noise block Characterized by a gain and noise figure Equivalent noise temperature Referenced at input to LNB 0 ) 1 ( T F T T A e - + =
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EE475 DR. Kirkman Lecture 5 USC 6 Receiver G/T Compare receivers by G/T
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Unformatted text preview: e = e A t t T G kB R P G SNR 2 2 ) 4 ( Te was referenced at input to LNB so the gain is only gain of antenna LNB gain amplifies the signal and noise equally At the output of the LNB EE475 DR. Kirkman Lecture 5 USC 7 G/T e varies with location Variation is due to variation in antenna gain EE475 DR. Kirkman Lecture 5 USC 8 Uplink Budget EE475 DR. Kirkman Lecture 5 USC 9 Downlink EE475 DR. Kirkman Lecture 5 USC 10 Mtv EE475 DR. Kirkman Lecture 5 USC 11 Combining C/T ratios Must be added in natural units Add with respect to carrier Add like resistors in parallel T C T C T C T C T C d u log 10 1 1 1 = + = dBW/K K/W Calculate the Mtv example...
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Lecture6 - e = e A t t T G kB R P G SNR 2 2 ) 4 ( Te was...

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