Amaliy ish bajardi: 830-19 guruh talabasi Orifjonov Javohir Tekshirdi: Alimdjanov Xayot Toshkent 2022 amaliy ish №1


– variant Variantlar bo'yicha dastlabki ma'lumotlar


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9 – variant
Variantlar bo'yicha dastlabki ma'lumotlar

Jurnaldagi raqami.

Вцс
kbit/s

R

α
bit/(с·Гц)

d
km

9

1586

0,875

0,8

34 000



  1. Всс = 96 kbit/sek

Ввх = Вцс + Всс = 1586 + 96 = 1682 kbit/sek
Вк = Ввх / R = 1682/ 0,875 = 1922,2 kbit/sek
Врк = Вк / log2М = 1922,2 / log24 = 1922,2 / 2 = 961,14 kbit/sek


  1. Пс = Врк (1+α) = 961,14 (1+0,8) = 1730,2=1,7 kHz

П1 = (1,1…1,3)∙ Пс = 1,1*1730,2 = 1903, 22 = 1.9 kHz

  1. Lдоп = Lатм+Lд+Lн+Lп = 0,15 + 0 + 0,3 + 0,05 = 0,5 dB

L0=20 log ((4 ∙ π ∙ d) / λ) = 20 log ((4 ∙ 3,14 ∙ 34 000 ∙ 103) / 21,44 ∙ 10-3) =
= 20 log (17,57 ∙ 109) = 20 ∙ 12,845 = 256,9 dB
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