Performance of Fading Channels in Non-orthogonal Multiple Access

The concept of non-orthogonal multiple access(NOMA) is to provide the far users with high power modulated signal in order to increase the transmission efficiency. Power allocation method is used to design non-orthogonal multiple access algorithm, where the signals are modulated with respect to power and time. This type of design improves the energy efficiency and even the far users will be receiving the data bits successfully. The major threat is the fading noise that are added onto the channels. Gaussian distribution and spectral density cause AWGN fading, whereas the presence of scatters between the receiver and transmitter causes Rayleigh fading. These fading channels are computed and the simulation results inferred illustrates that AWGN fading channel performance is better when compared with Rayleigh fading channel. Estimation of channel helps to attain spectral efficient wireless communications. Error correcting block (ECB) based on Hamming code is been implemented. Whenever bit error is generated may be due to hardware faults or software faults it will be detected and corrected by ECB and this improves the data transfer.