Journal
IEEE ACCESS
Volume 9, Issue -, Pages 68435-68444Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2021.3077256
Keywords
Communication systems; Simulation; OFDM; Bit error rate; Modulation; Parity check codes; Encoding; Communication system signaling; OFDM; decoding; index modulation; LDPC coding
Categories
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2018R1D1A1B07050232]
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This paper presents a method to reduce the implementation complexity of LDPC decoding for OFDM-IM without compromising performance. By decomposing the posterior probability into multiple likelihood probabilities, the proposed approach significantly simplifies LDPC decoding in OFDM-IM, with simulation results confirming its effectiveness.
In this paper, the posterior probabilities of the low-density parity check (LDPC) coded bits are derived for the orthogonal frequency division multiplexing index modulation (OFDM-IM) system to reduce the implementation complexity of LDPC decoding without performance loss. Specifically, the complexity of LDPC decoding is reduced by decomposing the posterior probability of the coded bit into multiple likelihood probabilities, each of which is obtained for each subcarrier of the corresponding OFDM-IM subblock. The results of the complexity analysis indicate that the proposed approach significantly reduces the implementation complexity of LDPC decoding for OFDM-IM compared to the conventional approach. Furthermore, the simulation results confirm that the proposed approach provides the same bit error rate performance as the conventional approach.
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