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首页> 外文期刊>IEEE systems journal >Layered Orthogonal Frequency Division Multiplexing With Index Modulation
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Layered Orthogonal Frequency Division Multiplexing With Index Modulation

机译：带索引调制的分层正交频分复用

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摘要

In this paper, we propose a novel scheme termed layered orthogonal frequency division multiplexing with index modulation (L-OFDM-IM) to increase the spectral efficiency (SE) of OFDM-IM systems. In L-OFDM-IM, all subcarriers are first divided into multiple layers, each determining the active subcarriers and their modulated symbols. The index modulation (IM) bits are carried on the indices of the active subcarriers of all layers, which are overlapped and distinguishable with different signal constellations so that the number of the IM bits is larger than that in traditional OFDM-IM. A low-complexity detection is proposed to alleviate the high burden of the optimal maximum-likelihood detection at the receiver side. A closed-form upper bound on the bit error rate, the achievable rate, and diversity order are derived to characterize the performance of L-OFDM-IM. To enhance the diversity performance of L-OFDM-IM, we further propose coordinate interleaving L-OFDM-IM (CI-L-OFDM-IM), which interleaves the real and imaginary parts of the modulated symbols over two different subchannels. Computer simulations verify the theoretical analysis, and results show that L-OFDM-IM outperforms the conventional OFDM-IM scheme. Moreover, it is also confirmed that CI-L-OFDM-IM obtains an additional diversity order in comparison with L-OFDM-IM.
机译：在本文中，我们提出了一种称为索引调制的分层正交频分复用（L-OFDM-IM）的新方案，以提高OFDM-IM系统的频谱效率（SE）。在L-OFDM-IM中，首先将所有子载波划分为多个层，每个层确定活动子载波及其调制符号。索引调制（IM）位承载在所有层的活动子载波的索引上，这些索引通过不同的信号星座图重叠并可以区分，因此IM位的数量比传统的OFDM-IM大。提出了一种低复杂度的检测方法，以减轻接收机侧最优最大似然检测的高负担。得出误码率，可达到的率和分集阶数的封闭形式上限，以表征L-OFDM-IM的性能。为了提高L-OFDM-IM的分集性能，我们进一步提出了坐标交织L-OFDM-IM（CI-L-OFDM-IM），该交织在两个不同的子信道上交织了调制符号的实部和虚部。计算机仿真验证了理论分析，结果表明L-OFDM-IM优于传统的OFDM-IM方案。此外，还证实了与L-OFDM-IM相比，CI-L-OFDM-IM获得了额外的分集顺序。

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