降低FBMC-OQAM峰均值比方法的研究

针对滤波器组多载波/正交幅度调制(filter bank multi-carrier/offset quadrature amplitude modulation,FBMC-OQAM)系统峰均值比(peak to average power ratio,PAPR)过高的问题,提出一种应用在FBMC-OQAM系统中的双层迭代部分传输算法.所提算法在传统迭代部分传输序列(iterative partial transmit sequence algorithm,IPTS)算法的基础上,改进搜索方式,将相位因子向量分为奇偶分别进行迭代,扩大了搜索范围.再结合FBMC-OQAM系统的重叠特性,对数据块之间的重叠部分加以利用,将使得当前符号块加权后的信号与寄存窗中的信号之和的PAPR最小的相位因子向量作为最优相位因子向量,从而在不增加过多计算量的基础上提高了抑制PAPR的性能.仿真结果表示,改进的双层迭代部分传输序列(partial transmit sequence algorithm,PTS)算法的PAPR抑制效果显著优于传统算法,误码率低于传统算法,且计算复杂度显著低于PTS算法.

Research on the algorithm for reducing PAPR of FBMC-OQAM

Aiming at the problem that the Peak-to-Average Power Ratio(PAPR) is too high for the Filter Bank Multicarrier/Offset Quadrature Amplitude Modulation(FBMC-OQAM) system, a dual layered iterative partial transmit sequence algorithm in FBMC-OQAM system was proposed. Based on the traditional iterative partial transmit sequence algorithm, the proposed algorithm improves the search method, divides the phase factors into parity vectors to iterate, thus expandsing the search scope of the algorithm. Moreover, combined with the overlapping characteristics of FBMC-OQAM system, it uses the overlap between the data blocks. The proposed algorithm takes the phase factor vector that minimizes the PAPR of the sum of the signal after the current symbol block and the signal in the register window as the optimum phase factor vector, so as to improve the performance of the PAPR without increasing the amount of calculation. The simulation results show that the PAPR suppression effect of the improved dual layered iterative partial transmit sequence algorithm is significantly better than that of the traditional algorithm, the bit error rate is lower than that of the traditional algorithm, and the computational complexity is significantly lower than that of the partial transmission sequence algorithm.