PAPR Reduction in OFDM-IM Using Dither Signal Sets

Zhang, Siyu; Zheng, Hui

doi:10.1109/icceai55464.2022.00064

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…In OFDM-IM systems, part of information is indicated by the status of sub-carriers and the rest of information is carried by modulated constellation symbols. Compared to traditional OFDM, OFDM-IM offers flexible spectral efficiency, improved peak-to-average power ratio (PAPR) [9], [10], and greater energy efficiency [11]- [13]. Furthermore, the use of inactive sub-carriers in OFDM-IM enhances its resistance to inter-carrier interference (ICI), rendering it an appealing choice for vehicular [14], [15] and high-speed railway (HSR) communications [16], [17].…”

Section: A Introduction and Related Workmentioning

confidence: 99%

An Enhanced Channel Estimation Scheme in OFDM-IM Systems With Index Pilots for IEEE 802.11p Standard

Dong,

Zhang,

Shahrrava

et al. 2024

IEEE Access

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Orthogonal frequency division multiplexing with index modulation (OFDM-IM) is emerging as a robust technology, especially valued in vehicular communication scenarios for its resilience. In such dynamic environments, reliable channel estimation becomes critical to maintain system performance due to the fast time-varying and double dispersion channel nature. Despite the harsh conditions, OFDM-IM enhances system performance by leveraging inactive sub-carriers to convey additional information. However, these idle sub-carriers complicate channel estimation compared to traditional OFDM systems. In response to these challenges, this paper introduces an enhanced channel estimation scheme tailored for the IEEE 802.11p standard, which supports cooperative intelligent transport systems (C-ITS). Our proposed method, the enhanced time-domain reliable test frequency-domain interpolation with index pilots (E-TRFI-IP), strategically places pilots and utilizes the positions of inactive sub-carriers to facilitate accurate detection and prevent performance degradation from inadequate channel tracking. Additionally, to further improve channel estimation performance, a comparison threshold methodology for reliable sub-carriers test is introduced by utilizing the structure of IM and joint interpolation method. Extensive simulation results demonstrate that E-TRFI-IP significantly surpasses existing channel estimation methods for both OFDM and OFDM-IM in terms of channel estimation performance. Notably, OFDM-IM systems employing the E-TRFI-IP estimation scheme also exhibit superior performance in bit error rate (BER) compared to those using conventional OFDM-IM and other channel estimation techniques.INDEX TERMS Channel estimation, Orthogonal frequency division multiplexing (OFDM), Index modulation (IM), Time domain reliable test frequency domain interpolation (TRFI), IEEE 802.11p standard, Vehicular communications.

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Section: A Introduction and Related Workmentioning

confidence: 99%

An Enhanced Channel Estimation Scheme in OFDM-IM Systems With Index Pilots for IEEE 802.11p Standard

Dong,

Zhang,

Shahrrava

et al. 2024

IEEE Access

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“…This paper can be regarded as the first work utilizing the structure of OFDM-IM. According to this work, several schemes and algorithms are investigated and proposed to further explore idle sub-carriers for improving PAPR reduction performance [ 18 , 19 , 20 ] by utilizing multi-level or time-domain dither signals. However, all of the above works do not solve the problem of bit error rate (BER) degradation due to the introduction of dither signals.…”

Section: Introductionmentioning

confidence: 99%

A Hybrid PAPR Reduction Scheme in OFDM-IM Using Phase Rotation Factors and Dither Signals on Partial Sub-Carriers

Zhang

Zheng

2022

Entropy

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As a multi-carrier modulation technique, a high peak-to-average power ratio (PAPR) is a common issue suffered by orthogonal frequency division multiplexing with index modulation (OFDM-IM) due to its system structure. High PAPR may cause signal distortion, which affects correct symbol transmission. This paper tries to inject dither signals to the inactive (idle) sub-carriers, which is a unique transmission structure of OFDM-IM, to reduce PAPR. Unlike the previous works, which utilize all idle sub-carriers, the proposed PAPR reduction scheme utilizes selected partial sub-carriers. This method performs well in terms of bit error rate (BER) performance and energy efficiency, which are obvious drawbacks of the previous PAPR reduction works due to the introduction of dither signals. In addition, in this paper, phase rotation factors are combined with the dither signals to compensate for the PAPR reduction performance degradation due to the insufficient use of partial idle sub-carriers. Moreover, an energy detection scheme is designed and proposed in this paper in order to distinguish the index of phase rotation factor used for transmission. It is shown by extensive simulation results that the proposed hybrid PAPR reduction scheme is able to implement an impressive PAPR reduction performance among existing dither signa-based schemes as well as classical distortion-less PAPR reduction schemes. In addition, the proposed method obtains better error performance and energy efficiency than that of the previous works. At the error probability 10−4, the proposed method can achieve around 5 dB gain compared to the conventional dither signal-based schemes

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Comparison of Constant Envelope and Peak Insertion Schemes for PAPR Reduction in a 6G Waveform

Tipán,

Alvarez,

Arévalo

2024

2024 IEEE Eighth Ecuador Technical Chapters Meeting (ETCM)

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PAPR Reduction in OFDM-IM Using Dither Signal Sets

Cited by 6 publications

References 11 publications

An Enhanced Channel Estimation Scheme in OFDM-IM Systems With Index Pilots for IEEE 802.11p Standard

An Enhanced Channel Estimation Scheme in OFDM-IM Systems With Index Pilots for IEEE 802.11p Standard

A Hybrid PAPR Reduction Scheme in OFDM-IM Using Phase Rotation Factors and Dither Signals on Partial Sub-Carriers

Comparison of Constant Envelope and Peak Insertion Schemes for PAPR Reduction in a 6G Waveform

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