The fifth generation represents information networks to cater unprecedented growth in the number of connected devices. One of the goals of the 5G network is to build smart cities that can provide mobile industrial automation, vehicle connectivity, and IoT applications. In the present scenario, bandwidth is limited. Therefore, there is a need to develop a control system that can support applications demanding high-speed wireless connection and fully realized IoT. Presently turbo code is selected as channel FEC codes in 3G and 4G cellular systems. Polar codes invented by ErdalArikan in 2009 are of interest since the 3GPP standardization group is proposing it in 5G. Polar code construction deals with finding the set of most unreliable bit positions called the frozen set. However, this set is not only dependent on the code length and the code rate but also on channel conditions. In this paper, a universal polar code construction for a specific SNR to design a multi-user OFDM-IDMA system along with modified sum-product decoding algorithm is presented to reduce the implementation complexity and effect of carrier frequency offset. Therefore a proposed system can support M2M communication in 5G with high link reliability. Further, Taguchi based optimization technique is used to manage communication resources such as bandwidth and required SNR to achieve a desirable bit error rate. A proposed system with four users provides a bit error rate of 2.046*10-5 as compared with the existing turbo code based system for the minimum required SNR of 15 dB using 64 QAM modulation.
Volume 11 | Issue 7