OFDM序列调制的信息分组映射方法研究

Research on the Information Grouping Mapping Method for OFDM Index Modulation

目前,针对载波序列调制所用的二级信息映射模式展开研究,对现有载波序列调制方法进行了简要介绍,分析了现有方法在误码率性能方面存在的问题,为进一步提升系统误码率性能,提出了基于幅度相移键控(Amplitude Phase Shift Keying,APSK)调制的信息分组映射方法,建立了相应的APSK多圈星座图优化模型,提出了分圈遍历搜索算法,给出了APSK正交频分复用序列调制(Orthogonal Frequency Division Multiplexing with Index Modulation,OFDM-IM)的原理框图。仿真结果表明,与OFDM序列调制二级信息映射方法相比,该方法可提高调制信号的最小欧式距离,有效提升系统的误码率性能,在32进制、Eb/N0=12 dB的情况下,其误码率性能约有一个数量级的优势,具有较好的应用前景。

The two-stage information mapping method used for the current index modulation of OFDM is studied.The existing index modulation is simply introduced,and the BER problem of the existing modulation is analysed.To increase the system BER performance,an information grouping mapping method based on the APSK modulation is proposed,the multi-ring constellation optimization model is established,the sub ring ergodic search algorithm is given,and the corresponding APSK-OFDM-IM schematic diagram is given.The simulation results show that this method can increase the minimum Euclidean distance of modulation signals and the BER performance.In the case of 32-ary,Eb/N0=12 dB,the BER performance has an order of magnitude advantage.The proposed method has good application prospects.