Advanced PAPR Reduction Techniques for MultiBand OFDM in WBANs

The Multiband Orthogonal Frequency Division Multiplex (MB-OFDM) stands as an ultra-wideband (UWB) technology, endorsed by the MBOA. It employs a blend of OFDM in conjunction with time-frequency codes (TFC) to furnish data rates ranging from 55 to 480 Mbps across three frequency bands spanning 3.168 to 4.752 GHz. A primary issue associated with this approach is the high peak-to-average power ratio (PAPR), delineating the ratio between the signal’s peak power and its average power. This high PAPR primarily arises due to the intermodulation amid the subcarriers, resulting in significant signal distortion at the power amplifier’s output, attributed to the utilization of numerous subcarriers. To mitigate these issues, a Zadoff-Chu transform is implemented to curtail the autocorrelation of the input sequence pre and post the IFFT operation. The findings indicate that the Zadoff-Chu transform effectively mitigates PAPR, particularly the Zadoff-Chu pre-coding transform.