Simulations

In this study, simulations will be done using MATLAM Simulink simulator. In order for the simulation process to be successful, all simulation properties should be established. The simulations performed in the paper will have one main parameter. The reason behind this is to ensure that the results obtained are easy to understand and form conclusions regarding the study. The goal of this study is to compare IC techniques as far as suppression of interference in NOMA cellular networks is concerned. The main parameter in this study will be time interval when a cell station instructs user terminals to quit transmitting signals so that the only signals that will be received will be interfering signal and noise.

There are three main IC techniques that will be considered in the simulation. These are genetic algorithm technique, simulated annealing technique and the other technique where frequency agile band pass filters are placed after transmitters and in front of receivers to help in suppression of interference. Different simulations will be made for the three techniques in a common. The reason for this is to ensure that all techniques are assessed under same condition in order to ensure that the results obtained are free from bias.

The goal of the simulations will be to assess whether adaptive filters used by different techniques are able to update their coefficients in order to supress interference. One of the key variables that will be used in the simulations will be the error. The formula below will be used to calculate error in the simulation:

Usually, the goal of every technique is to place the above defined error to zero. However, there are inefficiencies in every technique that prevents the value of the error from being zero. There inefficiencies are what cause the differences that exist between these techniques from achieving the same results. The nature of adaptive algorithm for every technique is what causes the differences in performance for the techniques. The magnitude of error will be established and the main simulation will be based on relative power against taps number. Another key variable in the simulation will be interference to noise ratio calculated as follows:

Genetic algorithm technique

Simulated annealing technique

Frequency agile band pass filters placed after transmitters and in front of receivers