Performance Optimization of Polar Code Based OFDM Volte System Using Taguchi Method
Today network penetration is an essential gauge to enable and provide a variety of services to the masses. Presently, the available network bandwidth is limited to provide services and its applications on mobile at anytime and anywhere to users. Therefore, there is a need to expand the network capacity within the same available bandwidth to meet such intensive service requirements. Scheduling and resource allocation are necessary in increasing the throughput as well as system spectral efficiency of wireless systems. The resource allocation assigns bandwidth as well as power among the users. A scheduling mechanism helps to cater channel conditions. An algorithm based on Transmission Time Intervals (TTI) bundling packet scheduling mechanism is implemented to develop bandwidth efficient system. This will help to cater packet switching technique in 5G system. A Taguchi optimization method is proposed to optimize Bit Error Rate (BER) performance in terms of Signal to Noise Ratio (SNR), Fast Fourier Transform (FFT) points and spectral efficiency. This paper presents performance of the system with and without scheduling mechanism. The simulation results demonstrate that without TTI mechanism, proposed system requires 15.74 dB SNR to achieve BER of 1*10-4. Whereas, use of 3 TTI mechanism achieves same BER at 12.54 dB SNR. Thus, 3.2 dB reduction in SNR is achieved. Here 16 PSK modulation technique is considered in the presence of rayleigh channel. Further, the proposed system requires 15.74 dB SNR as compared to existing turbo coded OFDM scheme that requires 18 dB. Thus, it can be concluded that 3.74 dB reduction in SNR is achieved. Also, the system capacity increased two times at the cost of increase in computations.