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为有效降低正交频分复用系统峰均功率比,以最大效率开发利用电力线通信资源,提出了一种低复杂度的基于部分传输序列的改进技术。该技术在已调信号实部和虚部分别与相位因子相乘来降低峰均功率比的基础上,采用迭代算法优化相位因子,减小计算复杂度。仿真结果表明,算法以较快的收敛速度取得较优的相位序列,显著地降低了正交频分复用系统的峰均比,提高了低压电力线通信系统的性能。
In order to reduce the peak-to-average power ratio of Orthogonal Frequency Division Multiplexing (OFDM) system and develop and utilize the power line communication resources with maximum efficiency, an improved technique based on partial transmission sequence with low complexity is proposed. Based on the fact that the real part and the imaginary part of the modulated signal are respectively multiplied by the phase factor to reduce the peak-to-average power ratio, an iterative algorithm is used to optimize the phase factor and reduce the computational complexity. The simulation results show that the algorithm achieves better phase sequence with faster convergence rate, significantly reduces the peak-to-average ratio of orthogonal frequency division multiplexing system and improves the performance of low-voltage power line communication system.