This paper investigates the problem of synchronization for offset quadrature amplitude modulation based orthogonal frequency division multiplexing (OFDM/OQAM) systems based on the genetic algorithm. In order to increase the spectrum efficiency, an improved preamble structure without guard symbols is derived at first. On this basis, instead of deriving the log likelihood function of power spectral density, joint estimation of the symbol timing offset and carrier frequency offset based on the preamble proposed is formulated into a bivariate optimization problem. After that, an improved genetic algorithm is used to find its global optimum solution. Conclusions can be drawn from simulation results that the proposed method has advantages in the joint estimation of synchronization.

中文翻译：

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基于遗传算法的OFDM/OQAM系统联合同步估计

本文研究了基于遗传算法的正交频分复用(OFDM/OQAM)系统的偏移正交调幅的同步问题。为了提高频谱效率，首先推导出一种没有保护符号的改进前导结构。在此基础上，不是推导功率谱密度的对数似然函数，而是将基于所提出的前导码的符号定时偏移和载频偏移的联合估计公式化为一个二元优化问题。之后，使用改进的遗传算法寻找其全局最优解。从仿真结果可以得出结论，该方法在同步联合估计方面具有优势。