Wireless Communication Principles and System Formulas
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!!!!GENERAL!!!!
a mod b = a - b * floor(a/b)
x dBm = 10^(x/10) mW
10log(10 (mW) ) = 10 dB
!!PHY 2!!
VARIABLES:
P_r = Receiving power (W/mW)
P_T = Sending power (W/ mW)
G_T = Sending antenna gain
G_R = Receiving Antenna Gain
H_T = Sending antenna height (m)
H_R = Receiving Antenna height (m)
d = transmission distance (m)
λ = c/f = wavelength (m)
f = frequency (Hz)
c = Speed of light = 3 * 10^8 (m/s)
d_break = break point distance (m)
N_T = number of transmitting antennas
N_R = number of receiving antennas
v = velocity (m/s)
Free space Path Loss (Friis Equation):
P_R = P_T * G_T * G_R * (λ / (4πd))^2
unit antenna gain is 1.
(IF isotropic antenna (theory) P_R = P_T * (c / (4πdf))^2 )
P_r / P_t = Total Path loss (db)
TWO RAY:
Time between