Abstract

OFDM’s ability to efficiently utilize spectrum, achieve high data rates, and maintain robustness in challenging channel conditions has made it a fundamental technology in modern communication systems. In view of this, it is essential to obtain an optimized set of OFDM parameters providing minimum bit error rate. In this work, in the initial phase, experimentation is done to study the effect of variations in individual parameter of OFDM on bit error rate (BER) of OFDM scheme. In the second phase of work, in order to find optimized combination of OFDM parameters, Taguchi optimization technique is applied with the objective to minimize BER. Investigating how the cyclic prefix affects the performance of an OFDM (Orthogonal Frequency Division Multiplexing) system is crucial for optimizing BER (Bit Error Rate) performance and spectral efficiency across different modulation schemes such as BPSK, QPSK, 16-QAM, and 64-QAM. The cyclic prefix (CP) in OFDM systems plays a significant role in mitigating inter-symbol interference (ISI) caused by multipath propagation and in simplifying the equalization process. BER curves are obtained and compared for various lengths of the cyclic prefix. In similar manner, the experimentation is done for investigating the effect of variations of other parameters of OFDM namely FFT length and signal to noise ratio individually on bit error rate of OFDM scheme. Here, the statistical analysis technique referred to as ANOM (Analysis of Means) is utilized to examine experimental data and assess the importance of different factors and their interactions on the system’s performance. In this work, optimized set of values of cyclic prefix, bit error rate, FFT length and signal to noise ratio is obtained using Taguchi approach to minimize the BER of OFDM scheme.

Authors

Yogita Dinkar Kapse¹, Samadhan C. Kulkarni², Shripad Prabhakar Mohani³
COEP Technological University, India¹, Government College of Engineering, Jalgaon, India^2,3

Keywords

Orthogonal Frequency Division Multiplexing (OFDM), Bit Error Rate (BER), Signal-to-Noise Ratio (SNR), Taguchi optimization, Cyclic Prefix (CP)