How do I calculate the aggregate interference from multiple co-channel transmitters at a victim receiver?

Calculating the aggregate interference from multiple co-channel transmitters at a victim receiver determines the total interference power from all interfering sources, which is essential for evaluating whether the victim receiver can operate satisfactorily in the presence of multiple nearby transmitters on the same or overlapping frequencies. The calculation involves: identifying all interfering transmitters (list every co-channel, adjacent-channel, and harmonically-related transmitter within the interference range of the victim receiver), calculating the received interference power from each transmitter (for each interferer i: P_int_i = P_tx_i + G_tx_i(theta_i) + G_rx(phi_i) - PL(d_i) - L_misc, where P_tx_i is the transmitter power, G_tx_i is the transmitter antenna gain in the direction of the victim, G_rx is the victim receiver antenna gain in the direction of the interferer, PL is the path loss at distance d_i, and L_misc includes cable losses, building penetration, and polarization mismatch), summing the interference powers (the aggregate interference power is: I_agg = sum(P_int_i) for all interferers i, where the sum is performed in linear power units (watts), not dB), and calculating the victim's signal quality (the signal-to-interference-plus-noise ratio: SINR = P_desired / (I_agg + N_noise), where P_desired is the received desired signal power and N_noise is the receiver's thermal noise power; the SINR must exceed the minimum required SINR for the desired quality of service). The path loss model depends on the environment: free-space (LOS conditions), ITU-R P.452 (for interference between fixed stations), 3GPP models (for cellular, including urban, suburban, and rural scenarios), or site-specific ray-tracing (for the most accurate prediction).