基于动态功率阈值降低PAPR的部分传输序列算法

为了改善正交频分复用(orthogonal frequency division multiplexing, OFDM)系统的峰均功率比(peak-to-average power ratio, PAPR)性能,提出了一种基于动态功率阈值的低复杂度部分传输序列(partial transmit sequences, PTS)方法。在新的PTS方法中,引入了基于功率的判别函数,并给出了一种基于功率合理选择阈值的方法。在选取最小的PAPR值进行传输时,只对P-n大于等于阈值的样本信号进行峰值功率的计算。与传统的PTS算法相比,本文提出的算法在保证PAPR性能和误码率的情况下,能够更有效地降低计算复杂度。

Partial transmit sequences algorithm to reduce peak-to-average power ratio based on dynamic power threshold

A reduced complexity partial transmit sequences (PTS) scheme based on dynamic power threshold is proposed to resolve the intrinsic high peak-to-average power ratio (PAPR) problem of orthogonal frequency division multiplexing (OFDM) systems. In the proposed PTS scheme, a discrimination function P-n is generated to be compared with the threshold.Only those samples with P-n greater than or equal to a preset threshold are used for peak power calculation during the process of selecting a candidate signal with the lowest PAPR for transmission. Compared to the conventional PTS scheme, the proposed one achieves almost the same PAPR reduction performance and bit error rate(BER) distribution with much lower computational complexity.