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References in periodicals archive ?
The transmitter-receiver path loss computation is the addition of two different losses, that is, diffraction loss and free space loss. The diffraction loss is computed based on the Epstein-Peterson path geometry method which requires the coordinates to find the height of the relevant peaks located between the transmitter-receiver pair.
In the free space propagation zone and the extreme far zone, the channel loss is modeled by the free space loss. In the near shadowing zone, path loss and shadow fading are the most primary factors, thus a statistical model is utilized here.
Free Space Loss (FSL) model [20] is represented for radio wave propagation as
All Values in dB Maximum Minimum Mean Free Space Loss 51.67 31.67 41.67 ITU-R Model 64.23 31.23 47.73 Case A/Ant.
Free space loss (dB) = 20[log.sub.10](distance) + 20[log.sub.10](frequency) - 27.56 (6)
The maximum available path for the required availability, selected link hardware and the location of the installed link is determined by the condition in which the sum of the system gain and the two antenna gains are equal to the sum of the free space loss (FSL), the path attenuation due to rain and the path losses due to water vapor and atmospheric gases.
Bullington proposed that the diffraction loss has to be added to the free space loss when the path is obstructed [4, 14, 15].
In the nlos category for roof tops of similar height, the loss is expressed as sum of free space loss, multiscreen diffraction loss and loss due to coupling of wave propagation along the multiscreen path into the street where mobile is located.
However, the results from measurements between two rows of palm trees show smaller initial attenuation gradients because attenuation is due mainly to free space loss, ground reflection and/or canopy reflection.
Pr is the received signal strength, Pt is the transmitter power, Gt and Gr are gains of the antennas, FSL is free space losses, and other losses is the overall losses of power in the air due to multipath propagation.
Influence of HPA backoff parameter on a BER was studied for different free space losses and noise temperatures (Table).
Under "standard parameters", noise temperature at 290 K and free space losses at 157 dB in the uplink and 157 dB in the downlink a BER vanishes when transponder linear gain is at least 8 dB (Fig.