Logistic loss

The Logistic Loss radio signal propagation model uses circle centered at the transmitting mode to simulate radio coverage. The main role of Logistic Loss model is to serve as a more realistic replacement for the Unit Disk Graph model.

The signal strength at the receiving node is determined using exponential free-space loss, on which Additive White Gaussian Noise (AWGN) is overlaid. The packet reception probability is modeled using the logistic function from the signal strength.

Configuration parameters

• LOGLOSS_TRANSMIT_RANGE_M - The maximum transmission range, in meters. Positive number, default: 200.0.
• LOGLOSS_RX_SENSITIVITY_DBM - The maximal signal strength in dBm when the PRR is approximately 0%. A number, default: -100.
• LOGLOSS_RSSI_INFLECTION_POINT_DBM - This is the inflection point of the logistic loss function, i.e. where the second-order derivative becomes negative. It is also the point where 50% of packets with this signal strength are received. A number, default: -96.
• LOGLOSS_PATH_LOSS_EXPONENT - The value of the path exponent component in the log-distance model. The default value is selected assuming indoors and 2.4 GHz frequency band. A number, default: 3.0.
• AWGN_GAUSSIAN_STD - The standard deviation of the AWGN distribution, added to the RSSI. Non-negative number, default: 3.0.
• TX_POWER_DBM - Transmission power in dBm. A number, default: 0.