Abstract:

The high peak-to-average power ratio (PAPR) is a major drawback of multiple input multiple output orthogonal frequency division multiplexing systems (MIMOOFDM). To overcome this problem, a decomposed concurrent selected mapping (D-CSLM) algorithm is proposed. In the proposed algorithm, the candidate OFDM frames transmitted on antennas are decomposed to be real and imaginary parts, then multiplied with the same phase factors  respectively. After an inverse discrete Fourier transform (IDFT), the combined OFDM frames with minimum average PAPR is transmitted. Therefore, the proposed algorithm can provide sufficiently larger number of alternative transmit signals compared with the conventional concurrent selected mapping SLM algorithm, thus abtaining a better PAPR performance. Moreover, the computational complexity of the proposed algorithm is unchanging by using the conjugate symmetry property of real sequence. Simulation results demonstrate that the proposed algorithm can achieve a better PAPR performance with the same numerical complexity compared with the conventional concurrent SLM.