论文标题
具有索引调制的超级模式OFDM
Super-Mode OFDM with Index Modulation
论文作者
论文摘要
带有索引调制（OFDM-IM）的正交频分多路复用（OFDM）似乎是超越5G的有前途的多载波波形候选者，因为它具有诱人的优势，例如操作灵活性和易于实施。但是，对于5G服务（例如增强的移动宽带（EMBB）），OFDM-IM可能不是一个适当的选择，因为由于其无效的子载波，达到高数据速率是具有挑战性的。提高OFDM-IM光谱效率的一种解决方案是使用多个可区分星座（模式），还通过利用其无效子载体进行数据传输。本文提出了一种称为Super-Mode Ofdm-IM（SUM-OFDM-IM）的新型IM技术，其中联合选择了模式激活模式（地图）和子载波激活模式（SAPS），并且在多个子载波上重复编码传统的数据符号以获得多样性获得。对于提出的方案，设计了低复杂性检测器，进行了理论分析，并得出了一些位错误率（BER）上限。还使用基于软件定义的无线电（SDR）原型进行了实时实验，研究了所提出的系统的性能。我们表明，在光谱效率和错误性能方面，DM-im和ofdm-im表现出令人鼓舞的结果。因此，似乎是5G和超越通信系统的潜在候选人。
Orthogonal frequency division multiplexing (OFDM) with index modulation (OFDM-IM) appears as a promising multi-carrier waveform candidate for beyond 5G due to its attractive advantages such as operational flexibility and ease of implementation. However, OFDM-IM may not be a proper choice for 5G services such as enhanced mobile broadband (eMBB) since achieving high data rates is challenging because of its null subcarriers. One solution to enhance the spectral efficiency of OFDM-IM is the employment of multiple distinguishable constellations (modes) by also exploiting its null subcarriers for data transmission. This paper proposes a novel IM technique called super-mode OFDM-IM (SuM-OFDM-IM), where mode activation patterns (MAPs) and subcarrier activation patterns (SAPs) are jointly selected and conventional data symbols are repetition coded over multiple subcarriers to achieve a diversity gain. For the proposed scheme, a low-complexity detector is designed, theoretical analyses are performed and a bit error rate (BER) upper bound is derived. The performance of the proposed system is also investigated through real-time experiments using a software-defined radio (SDR) based prototype. We show that SuM-OFDM-IM exhibits promising results in terms of spectral efficiency and error performance; thus, appears as a potential candidate for 5G and beyond communication systems.
