Performance evaluation on the basis of Bit error rate for different order of Modulation and different length of Subchannels in ofdm system

TL;DR

This paper evaluates the bit error rate performance of OFDM systems using various modulation schemes and subchannel lengths, highlighting how these factors influence communication reliability.

Contribution

It provides an analysis of BER performance in OFDM with different modulation orders and subchannel lengths, offering insights into optimizing system parameters.

Findings

BER varies with modulation order and subchannel length

Optimal subchannel size improves system performance

Higher modulation orders increase error rates

Abstract

Today, we have required to accommodate a large number of users under a single base station. This can be possible only if we have some flexibility over the spectrum. Previously we have lots of multiplexing methods to accommodate large number of signals in time and frequency domain. But now we have required to accommodate a large number of users in the same bandwidth, without any fading over the received signal. So, orthogonality can be maintained over the frequency response. This technology is now more popular in the mobile communication domain, called Orthogonal Frequency Division Multiplexing (OFDM). Actually user data can be converted into the parallel form and then they are modulated using digital modulation techniques. Finally, they have followed by OFDM Modulator and cyclic prefix can be inserted into the OFDM symbols. Here, I have worked on the measurement of Bit error rate for different modulation techniques in OFDM technology. It has been considered that subchannel size is not constant. According to that I have concluded the overall idea regarding the performance under OFDM technology.