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Today, we have required to accommodate a large number of users under a singlebase station. This can be possible only if we have some flexibility over thespectrum. Previously we have lots of multiplexing methods to accommodate largenumber of signals in time and frequency domain. But now we have required toaccommodate a large number of users in the same bandwidth, without any fadingover the received signal. So, orthogonality can be maintained over thefrequency response. This technology is now more popular in the mobilecommunication domain, called Orthogonal Frequency Division Multiplexing (OFDM).Actually user data can be converted into the parallel form and then they aremodulated using digital modulation techniques. Finally, they have followed byOFDM Modulator and cyclic prefix can be inserted into the OFDM symbols. Here, Ihave worked on the measurement of Bit error rate for different modulationtechniques in OFDM technology. It has been considered that subchannel size isnot constant. According to that I have concluded the overall idea regarding theperformance under OFDM technology.

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