A Technique to Reduce PAPR for OFDM-IM Using Multiple Mapping Rules for IM

Jo, Hanseong; Lee, Yong-Gu; Jeong, Sangin; Choi, Jinho

doi:10.1109/vtcspring.2018.8417535

Cited by 5 publications

(4 citation statements)

References 26 publications

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“…As we analyzed, the efficiency of permutation is small if k is large, which means the permutation may not used in the SLM scheme for large k compared to n. Therefore, we first consider the case of no permutation is used in the SLM scheme. In this case, clearly we have d 1 (i) = d 2 (i) = i and thus (21) becomes…”

Section: A Optimal Condition For Pss Without Permutationmentioning

confidence: 99%

“…Note that the SAP of an OFDM-IM block affects the envelope distribution of the corresponding OFDM-IM signal in the time domain and thus its PAPR [22]. Therefore, in OFDM-IM systems, the permutation procedure followed by the multiplication of the phase sequence has been newly introduced in [21]. That is, the SLM with permutation is depicted in Fig.…”

Section: The Slm Scheme With Permutation For Ofdm-im Systemsmentioning

confidence: 99%

“…The conventional SLM scheme in [13] can be easily applied to the OFDM-IM systems, but the analytical results for the desirable PSS in [17]- [20] cannot be naively applied to the OFDM-IM system because the OFDM-IM system has inactive subcarriers. Also, in [21], permutation procedure in the frequency domain has been proposed in the SLM scheme for OFDM-IM systems in order to make the subcarrier activation pattern (SAP) in the frequency domain diverse. This is because the envelope distribution of the OFDM-IM signal in the time domain depends on the SAP [22].…”

Section: Introductionmentioning

confidence: 99%

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On the Phase Sequences and Permutation Functions in the SLM Scheme for OFDM-IM Systems

Kim

2020

IEEE Access

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In orthogonal frequency division multiplexing with index modulation (OFDM-IM), the active subcarriers can convey information bits by modulated symbols as well as their indices. OFDM-IM has attracted a great deal of attention from researchers by virtue of high energy efficiency. Unfortunately, OFDM-IM has inherited large peak-to-average power ratio (PAPR) of the classical OFDM signal, but there are few works dealing with it. Selected mapping (SLM) is a promising PAPR reduction technique that is distortionless, has good PAPR reducing capability, and can be easily adapted in OFDM-IM systems. In SLM for OFDM-IM systems, the phase sequences rotate the OFDM-IM block in the frequency domain before the inverse fast Fourier transform (IFFT) is applied. Also, in the recent work, permutation procedure in the frequency domain has been proposed before multiplication of phase sequences in SLM, which is newly introduced in OFDM-IM regime. Unfortunately, the theoretical investigation on the efficiency of the permutation in SLM is insufficient. In this paper, we investigate the phase sequence set (PSS) and permutation functions in the SLM scheme for OFDM-IM systems; First, the efficiency of the permutation is analyzed as a function of the number of active subcarriers. Second, the optimal conditions for the PSS and permutation functions are derived, which is verified through simulations. INDEX TERMS Index modulation (IM), orthogonal frequency division multiplexing (OFDM), peak-toaverage power ratio (PAPR), permutation, phase sequence, selected mapping (SLM).

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Section: A Optimal Condition For Pss Without Permutationmentioning

confidence: 99%

Section: The Slm Scheme With Permutation For Ofdm-im Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the Phase Sequences and Permutation Functions in the SLM Scheme for OFDM-IM Systems

Kim

2020

IEEE Access

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“…In recent years, OFDM with index modulation (OFDM-IM) have become more appealing due to its flexible implementation for serving different user requirements [11,12]. In the literature, it is shown that OFDM-IM outperforms the classical OFDM under non-orthogonal transmission, doubly dispersive channels, asynchronous transmission and hardware impairments including peak-to-average-power ratio, carrier frequency offset, and in-phase and quadrature imbalance [13][14][15][16][17][18][19][20]. However, INI analysis for OFDM-IM is missing in the literature.…”

Section: Introductionmentioning

confidence: 99%

Inter‐numerology interference in OFDM‐IM systems

et al. 2021

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In 5G and beyond communication systems, distinct numerologies can coexist to serve diverse requirements for users and applications. However, the inter‐numerology interference (INI) is a main challenge that significantly impacts the system performance. Therefore, the performance under INI has become an essential evaluation metric for the suitability of the different transmission schemes in the future communication systems. This paper analyzes the impact of INI on the performance of orthogonal frequency division multiplexing with index modulation (OFDM‐IM) systems. Specifically, an analytical expression of the INI level in OFDM‐IM systems is presented as a function of the subcarrier activation ratio (SAR) and subcarrier activation probability (SAP). Furthermore, aiming at reducing the INI level, an adaptive subcarrier mapping scheme (SMS) is proposed based on the conventional combinatorial mapping scheme. Moreover, analysis and evaluation of SAR and SAP are performed regarding the requirements of 5G and beyond services. It is proved that the INI level in OFDM‐IM systems is highly dependent not only on the number of active subcarriers but also on their position in an OFDM block.

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Security aware hybrid precoding based peak‐to‐average power ratio reduction Approaches for telecommunication systems

Sarkar¹,

Kumar

Maji

2020

Int J Communication

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SummaryIn wireless telecommunication, one of the modulation approaches used is the orthogonal frequency division multiplexing (OFDM). Moreover, the high peak‐to‐average power ratio (PAPR) is the one notorious demerit in OFDM systems. Hence, the high power amplifier (HPA) is used in its linear region. Otherwise, the bit error rate (BER) will be increased. Several approaches are proposed in the wireless communications for reducing the PAPR issue. In this paper, we propose a hybrid Discrete Hartley Matrix Transform (DHMT) precoding using both selected mapping (SLM) and partial transmit sequence (PTS) PAPR reduction strategies. For the multicarrier modulation process, instead of Inverse Fast Fourier transform (IFFT) operation, the DHMT operation is used because of its low computational complexity. Based on multi‐chaotic, the time‐frequency domain encryption (TFDE) approach is adopted for physical layer security to confirm the security in data transmission. For enhancing the physical layer security, the proposed encryption system generates chaotic sequences based on Logistic maps and Lozi in the frequency and time domains together. In this study, the implementation of the DHMT‐based OFDM system is processed to reduce the maximum PAPR. Implementation is performed on the MATLAB platform, and the performances are calculated using complementary cumulative distribution function (CCDF), BER regards to signal‐to‐noise ratio (SNR), and the outputs are compared based on the computation time. However, compared with the existing models, the proposed model produced better PAPR minimization regarding SNR.

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A Technique to Reduce PAPR for OFDM-IM Using Multiple Mapping Rules for IM

Cited by 5 publications

References 26 publications

On the Phase Sequences and Permutation Functions in the SLM Scheme for OFDM-IM Systems

On the Phase Sequences and Permutation Functions in the SLM Scheme for OFDM-IM Systems

Inter‐numerology interference in OFDM‐IM systems

Security aware hybrid precoding based peak‐to‐average power ratio reduction Approaches for telecommunication systems

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