Abstract:

In order to reduce the peak to average power ratio (PAPR) of the orthogonal frequency division multiplexing (OFDM) signal and improve the bit error rate (BER) performance of the OFDM system,a low complexity partial transmit sequence (PTS) algorithm is proposed which is based on shifting partial time domain sequence. In the proposed scheme, the transmitter needs only one inverse fast Fourier transform (IFFT) operation to acquire the alternative sequences, and the receiver can restore the cyclic shift factor for blind detection by comparing with the distance of the inversed rotation sequences and its nearest constellation points. The PAPR and the BER performance of the system are analysed by using the different selection criteria for the best sequence, including minimum PAPR and maximum cross correlation (CORR). The simulation results show that the proposed method can reduce the PAPR of OFDM signal and improve the BER performance of OFDM system efficiently. On the other hand, compared with the conventional PTS and selected mapping (SLM) algorithm, the proposed method can reduce the computational complexity obviously.