SINR Simulation in 802.11n Networks

Two factors determine the possibility of transmitting on 802.11 networks. The first is the level of the signal received by the receiving station. Depending on this parameter system can select the appropriate modulation and coding scheme. As the power level increases, the maximum theoretical bit rate increases. This is related to the modulation type change. In 802.11 n the highest bit rates are obtained for 64QAM modulation. The literature standard specifies the received power levels necessary to obtain a given bit rate, but there is no detailed information on the power characteristics of the power above and below the threshold. In addition, this level is a function of the channel width and it is higher for a 40 MHz channel. The second parameter that determines the choice of MCS for transmission is SINR (Signal to Noise and Interference Ratio). It is defined as function of type and modulation scheme and does not depend directly on signal level. Also in this case there is no information about the operation of the system in the vicinity threshold values. The author performed a series of simulations using the newest 3.26 release of NS-3 Simulator to determine the behavior of the standard for threshold SINR values. The NS-3.26 version allows to analyze the effect of interference on the resulting throughput using the new SpectrumWifiPhy physical layer model.