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针对传统利用信号概率分布特性设计压扩函数的方法还存在计算复杂度较高和灵活性不够的问题,文章在研究网格正交频分复用(LOFDM)系统峰均功率比问题的同时提出了一种新的低复杂度非线性压扩变换算法。该算法假设压扩后信号的幅度分布为一个连续函数,从而避免了压扩函数推导和功率守恒过程中繁重的计算问题。此外,由于该连续概率密度函数引入的带外失真小,所以还具有优异的误码性能。在保证压扩前后功率不变的条件下,该算法具有足够的设计灵活性以满足不同系统需求。仿真结果表明所提出的算法性能要明显优于传统非线性压扩变换算法。
In order to solve the problem of traditional peak-to-average power ratio of grid orthogonal frequency division multiplexing (LOFDM) system, aiming at the problem that the traditional method of designing companding function based on the signal probability distribution feature has high computational complexity and insufficient flexibility, A New Low Complexity Nonlinear Companding Transformation Algorithm. The algorithm assumes that the amplitude distribution of the signal after companding is a continuous function, which avoids the heavy computational problems in the derivation of companding function and the conservation of power. In addition, because of the low out-of-band distortion introduced by the continuous probability density function, it also has excellent error performance. The algorithm has sufficient design flexibility to meet different system requirements under the condition of unchanged power before and after companding. The simulation results show that the performance of the proposed algorithm is obviously better than the traditional nonlinear companding algorithm.