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Entropy coding aided adaptive subcarrier-index modulated OFDM

Entropy coding aided adaptive subcarrier-index modulated OFDM
Entropy coding aided adaptive subcarrier-index modulated OFDM
We propose entropy coding aided adaptive subcarrier index modulated orthogonal frequency division multiplexing (SIM-OFDM). In conventional SIM-OFDM, the indices of the subcarriers activated are capable of conveying extra information. We propose the novel concept of compressing the index information bits by employing Huffman coding. The probabilities of the different subcarrier activation patterns are obtained from an optimization procedure, which improves the performance of the scheme. Both the maximum-likelihood (ML) as well as the logarithmic-likelihood ratio (LLR-) based soft detector may be employed for detecting the subcarriers activated as well as the information mapped to the classic constellation symbols. As an additional advantage of employing the variable-length Huffman codebook, all the legitimate subcarrier activation patterns may be employed, whereas the conventional SIM-OFDM is capable of using only a subset of the patterns. Our simulation results show that an improved performance is attainable by the proposed system.
2169-3536
1-16
Kadir, Mohammad Ismat
35935725-6783-4030-b009-61da20173694
Zhang, Hongming
ebd930db-9cd8-43ff-8b73-92c1d7f0108b
Chen, Sheng
9310a111-f79a-48b8-98c7-383ca93cbb80
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Kadir, Mohammad Ismat
35935725-6783-4030-b009-61da20173694
Zhang, Hongming
ebd930db-9cd8-43ff-8b73-92c1d7f0108b
Chen, Sheng
9310a111-f79a-48b8-98c7-383ca93cbb80
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Kadir, Mohammad Ismat, Zhang, Hongming, Chen, Sheng and Hanzo, Lajos (2018) Entropy coding aided adaptive subcarrier-index modulated OFDM. IEEE Access, 1-16. (doi:10.1109/ACCESS.2018.2801561).

Record type: Article

Abstract

We propose entropy coding aided adaptive subcarrier index modulated orthogonal frequency division multiplexing (SIM-OFDM). In conventional SIM-OFDM, the indices of the subcarriers activated are capable of conveying extra information. We propose the novel concept of compressing the index information bits by employing Huffman coding. The probabilities of the different subcarrier activation patterns are obtained from an optimization procedure, which improves the performance of the scheme. Both the maximum-likelihood (ML) as well as the logarithmic-likelihood ratio (LLR-) based soft detector may be employed for detecting the subcarriers activated as well as the information mapped to the classic constellation symbols. As an additional advantage of employing the variable-length Huffman codebook, all the legitimate subcarrier activation patterns may be employed, whereas the conventional SIM-OFDM is capable of using only a subset of the patterns. Our simulation results show that an improved performance is attainable by the proposed system.

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More information

Accepted/In Press date: 27 January 2018
e-pub ahead of print date: 2 February 2018

Identifiers

Local EPrints ID: 417727
URI: http://eprints.soton.ac.uk/id/eprint/417727
ISSN: 2169-3536
PURE UUID: d91e560b-15f6-4704-854b-b0a378d3146e
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

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Date deposited: 12 Feb 2018 17:30
Last modified: 07 Oct 2020 01:33

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