A peak power reduction scheme with phase-control of clustered parity-carriers for a systematic block-coded OFDM signal

In this paper, we propose a peak-power-reduction (PPR) scheme for a systematic block-coded OFDM signal. In this scheme, the peak power of the OFDM signal is reduced by adjusting the cluster phase, which contains only parity-carriers, so as to minimize the peak-to-average power ratio (PAPR) at the transmitter. At the receiver, the original parity-carrier signal is replicated using the decided-value of received data-carriers corresponding to data-bits of the code-word. Thus, the phase rotation value of the cluster is estimated by comparing the received signal of the parity-carrier and its replica. A reduction of about 2.5 dB in peak power and approximately the same BER performance as the case of ideal decoding are achieved by applying the PPR scheme to an OFDM system with 126 subcarriers in multipath fading conditions.