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http://dx.doi.org/10.4218/etrij.2021-0058

Group-indexed orthogonal frequency division multiplexing index modulation aided performance trade off  

Anushya, Thomas Wilfred Edison Athisaya (Department of ECE, Anna University)
Laxmikandan, Thangavelu (Department of ECE, Anna University)
Manimekalai, Thirunavukkarasu (Department of ECE, Anna University)
Publication Information
ETRI Journal / v.44, no.1, 2022 , pp. 105-116 More about this Journal
Abstract
In this study, a novel group-indexed orthogonal frequency division multiplexing index modulation (OFDM-IM) scheme is proposed to achieve a tradeoff between spectral efficiency (SE) and bit-error-rate (BER) performance. In the proposed scheme, the total subcarriers in a group are divided into subgroups, and additional bits are transmitted by subgroup indexing, unlike the conventional OFDM-IM scheme, which uses index bits to select active subcarriers. With the proposed scheme, the additional degree of freedom provided by the number of active subgroups selected provides a tradeoff between spectral efficiency and BER performance. Decoding is performed in steps to reduce computional complexity in the decoder design. Simulaton results show that the number of active subgroups selected influences the proposed scheme's performance in terms of energy efficiency, spectral efficiency, and BER performance.
Keywords
BER; index modulation; low complexity decoder; OFDM-IM; spectral efficiency;
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