Subblock design aided orthogonal frequency division multiplexing with all index modulation using search algorithm,Transactions on Emerging Telecommunications Technologies

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Subblock design aided orthogonal frequency division multiplexing with all index modulation using search algorithm
Transactions on Emerging Telecommunications Technologies ( IF 2.5 ) Pub Date : 2021-06-13 , DOI: 10.1002/ett.4311
Yuxin Shi ₁ , Xinjin Lu ₁ , Junshan Luo ₁ , Shilian Wang ₁

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Orthogonal frequency division multiplexing with index modulation (OFDM-IM) harvests significantly better error performance compared with OFDM due to its design of the index bits. However, the structure of conventional OFDM-IM scheme does not fully focus on the enhancement of the bit error rate (BER) performance. In the proposed subblock design aided OFDM with all index modulation (SD-OFDM-AIM), unconditional pairwise error probability (UPEP) is taken as the objective function to select the subblock realizations with low error rates, leading to the BER performance enhancement. Noticing that UPEP uses the channel state information (CSI), we fully discuss the calculation of CSI and analyze the effect on subblock design under imperfect channel evaluation. Moreover, inspired by sphere decoding method, we propose the low complexity decoder to remove the high burden of computational complexity in former OFDM with all index modulation (OFDM-AIM) after the reconstruction of the look-up table. The simulation results demonstrate its superiority at BER performance compared with the index modulated OFDM schemes and OFDM-AIM.

中文翻译：

使用搜索算法的全索引调制的子块设计辅助正交频分复用

与 OFDM 相比，具有索引调制的正交频分复用 (OFDM-IM) 因其索引位的设计而获得了明显更好的错误性能。然而，传统OFDM-IM方案的结构并没有完全专注于误码率(BER)性能的增强。在所提出的全索引调制子块设计辅助OFDM（SD-OFDM-AIM）中，以无条件成对错误概率（UPEP）为目标函数来选择低错误率的子块实现，从而提高BER性能。注意到UPEP使用信道状态信息（CSI），我们充分讨论了CSI的计算并分析了在不完善的信道评估下对子块设计的影响。此外，受球体解码方法的启发，我们提出了低复杂度解码器，以在重建查找表后消除前 OFDM 全索引调制 (OFDM-AIM) 中计算复杂度的高负担。仿真结果证明了与索引调制 OFDM 方案和 OFDM-AIM 相比，其在 BER 性能方面的优越性。

更新日期：2021-06-13

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