A Low Complexity Subcarrier Activation Scheme for OFDM with Index Modulation
DOI:
https://doi.org/10.3103/S0735272724020018Keywords:
Orthogonal frequency division multiplexing, subcarrier index modulation, subcarrier activation pattern, direct subcarrier activationAbstract
In orthogonal frequency division multiplexing with index modulation (OFDM-IM) data is mapped to subcarrier activation
patterns (SAPs) by using look-up tables or combinatorial schemes. The complexity of these mapping schemes increases
with the number of subcarriers. Therefore, they are applied to subgroups of subcarriers, but unfortunately at the expense of
a reduction in the amount of data loaded to an OFDM block. In this paper, a low-complexity direct data to SAP mapping is
proposed, the necessary analysis to determine the analytical bit error rate (BER) is presented, then computer simulations are
performed to find and compare theoretical and simulated BER results under frequency selective Rayleigh fading channel. The
proposed scheme can load more data bits to an OFDM block, as compared with conventional schemes. The results from Computer
simulations demonstrate the superiority of OFDM-IM system using the proposed scheme over conventional OFDM-IM in terms
of BER performance.
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