Decimation-in-Time FFT Subblocking for Partial Transmit Sequence OFDM

The authors consider an IFFT-based technique for reducing the Peak-to-Average Power Ratio (PAPR) of an Orthogonal Frequency Division Multiplexing (OFDM) signal. The intermediate signals in a radix Decimation-In-Time (DIT) algorithm is used for sub-block partitioning in the Partial Transmit Sequence (PTS) technique. They present a new sub-blocking technique which significantly reduces the computational complexity while providing PAPR reduction comparable to that with ordinary PTS. Orthogonal Frequency Division Multiplexing (OFDM) has been proposed in various wireless communication standards such as IEEE 802.11, IEEE 802.16, and IEEE 802.15.3a. The benefits of OFDM include high bandwidth efficiency, resistance to RF interference, and robustness to multipath fading.