Low-Complexity LLR Calculation for OFDM With Index Modulation

被引：26

作者：

Hu, Zeng ^{[1
]}

Chen, Fangjiong ^{[1
]}

Wen, Miaowen ^{[1
]}

Ji, Fei ^{[1
]}

Yu, Hua ^{[1
]}

机构：

[1] South China Univ Technol, Sch Elect & Informat Engn, Guangzhou 510641, Guangdong, Peoples R China

来源：

IEEE WIRELESS COMMUNICATIONS LETTERS | 2018年 / 7卷 / 04期

关键词：

OFDM; index modulation; convolutional code; log likelihood ratio (LLR); maximum a posteriori (MAP); WIRELESS NETWORKS;

D O I：

10.1109/LWC.2018.2802949

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

Orthogonal frequency division multiplexing with index modulation (OFDM-IM) is a promising multicarrier transmission technique. In OFDM-IM, only a subset of subcarriers are activated to transmit modulated symbols and the indices of the activated subcarriers are used to convey information bits implicitly. In the coded OFDM-IM system, we need to calculate the log likelihood ratio (LLR) value of each bit, whose computational complexity is extremely high due to the dependence between the subcarriers caused by the subcarrier-index modulation. In this letter, we propose a novel simplified LLR calculation algorithm for OFDM-IM. Simulation results show that the proposed algorithm achieves near-optimal coded bit error rate performance with considerably low computational complexity.

引用

页码：618 / 621

页数：4

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