Zadaniye1

import numpy as np

# Constants
PTX = 1
kn = 2
hBS = 30
hAB = 1
f0 = 900
Δf = 80
S = 3
T = 300

# Calculate L in dB
lgd = np.log10(d)
L_dB = 46.3 + 33.9 * np.log10(f0) - 13.82 * np.log10(hBS) - a * (hAB) + (44.9 - 6.55 * np.log10(hAB)) * lgd + S

# Calculate L
L = 10**(L_dB / 10)

# Calculate noise power
PN = Δf * T * kn * kn

# Calculate received power
PRX = PTX / L

# Calculate SNR
SNR = PRX / PN

# Plot graph
import matplotlib.pyplot as plt
d = np.linspace(0, 100, num=1000)
plt.plot(d, SNR)
plt.xlabel("Distance (d)")
plt.ylabel("SNR")
plt.show()