Challenges Faced by OFDM Technique for Broadband Wireless Mobile Communication

Orthogonal Frequency Division Multiplexing (OFDM) has been adopted as a predominant access technique to meet the challenges offered by next generation broadband wireless mobile systems. OFDM has gained a lot of interest in recent years because of its superior performance and benefits over older, more traditional single-carrier modulation methods. OFDM has the ability to cope with severe channel conditions without complex equalization filters and simultaneously provides high spectral efficiency due to orthogonal multiplexing of sub-carriers. The implementation of OFDM system is simplified through use of efficient signal processing techniques like FFT/IFFT. Despite many potential advantages offered by OFDM system, it also suffers from major drawbacks like Inter/Intra Symbol Interference, Inter-carrier Interference, PAPR, etc.