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正交频分复用(OFDM)技术是一种多载波调制方式。作为第四代移动通信系统的核心技术,OFDM己成为当今高速无线通信领域的研究热点。正交频分复用(OFDM)系统存在高峰值平均功率比(PAPR)问题,这一问题会导致系统性能降低,为其实用化设置了障碍。文中研究了一种改进的降低PAPR的非线性压缩与扩展算法,可以得到更好的PAPR性能。该方法的特点在于采用一种计算复杂度较低的非线性压扩函数,同时融合了叠加训练序列方法的改进非线性压扩算法,从而有效地降低系统PAPR。理论研究和仿真结果表明,与传统方法相比,所提出的改进压缩与扩展方法可以在降低系统复杂度的同时得到更好的PAPR性能。
Orthogonal Frequency Division Multiplexing (OFDM) technology is a multi-carrier modulation method. As the core technology of the fourth generation mobile communication system, OFDM has become a research hotspot in the field of high-speed wireless communication. Orthogonal Frequency Division Multiplexing (OFDM) systems suffer from high peak-to-average power ratio (PAPR) problems, which can result in reduced system performance and create obstacles for their practical use. In this paper, we study an improved non-linear PAPR reduction and expansion algorithm, which can get better PAPR performance. The method is characterized by using a nonlinear companding function with low computational complexity and combining the improved non-linear companding algorithm with superposition training sequence method, so as to effectively reduce the system PAPR. The theoretical research and simulation results show that the proposed improved compression and expansion methods can achieve better PAPR performance while reducing system complexity than traditional methods.