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Adaptive dual-mode OFDM with index modulation

机译：具有索引调制的自适应双模OFDM

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摘要

With the integration of the index modulation concept, the popular OFDM has gained an appealing new dimension. However, OFDM with index modulation (OFDM-IM) causes a decrease in data rate for higher order modulations due to its unused subcarriers. Recently, dual-mode OFDM with index modulation (DM-OFDM-IM) has been proposed to prevent this decrease in data rate. The spectral efficiency (SE) of both techniques depends on the selection of different parameters, such as modulation types and number of active subcarriers. However, the quality of the wireless channel has not been taken into account yet to increase the data rate. In this paper, we propose a new adaptive DM-OFDM-IM (A-DM-OFDM-IM) system to enhance the bit error probability (BER) performance considering the channel conditions and obtain a substantial increase in SE. Unlike the previous DM-OFDM-IM and the classical OFDM-IM schemes, our proposed system enables the use of different types of modulations for different subblocks in one OFDM signal. We demonstrate that the SE of the proposed system is comparable with that of its OFDM-IM and DM-OFDM-IM counterpart under frequency selective Rayleigh channels. Moreover, computer simulations corroborate that the derived theoretical results are considerably accurate for the SE of A-DM-OFDM-IM systems.
机译：通过索引调制概念的集成，流行的OFDM获得了吸引人的新维度。但是，具有索引调制的OFDM（OFDM-IM）由于未使用的子载波，导致高阶调制的数据速率降低。近来，已经提出了具有索引调制的双模式OFDM（DM-OFDM-IM），以防止这种数据速率的降低。两种技术的频谱效率（SE）取决于不同参数的选择，例如调制类型和有效副载波的数量。但是，尚未考虑无线信道的质量以提高数据速率。在本文中，我们提出了一种新的自适应DM-OFDM-IM（A-DM-OFDM-IM）系统，以在考虑信道条件的情况下提高误码率（BER）性能，并大幅提高SE。与以前的DM-OFDM-IM和传统的OFDM-IM方案不同，我们提出的系统能够对一个OFDM信号中的不同子块使用不同类型的调制。我们证明，在频率选择性瑞利信道下，拟议系统的SE与其OFDM-IM和DM-OFDM-IM对应的SE相当。此外，计算机仿真证实了所得出的理论结果对于A-DM-OFDM-IM系统的SE相当准确。

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