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Robust Channel Estimation for MIMO-OFDM-IM Full-Duplex Relaying under Residual Self-Interference in Time-Varying Fading

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Robust Channel Estimation for MIMO-OFDM-IM Full-Duplex Relaying under Residual Self-Interference in Time-Varying Fading

Collection	RMUTK Research Repository (RMUTK IR) วารสารวิชาการ — e-Journal Articles
ID RMUTK Digital	RMUTK000202
Title	Robust Channel Estimation for MIMO-OFDM-IM Full-Duplex Relaying under Residual Self-Interference in Time-Varying Fading
Alternative title	Robust Channel Estimation for MIMO-OFDM-IM Full-Duplex Relaying under Residual Self-Interference in Time-Varying Fading
Authors	รศ.ดร.ธนัยรัตน์ มาต๊ะ ผู้แต่งหลัก รศ.ดร.พิสิฐ บุญศรีเมือง (สถาบันเทคโนโลยีพระจอมเกล้าเจ้าคุณทหารลาดกระบัง)
Faculty	คณะวิศวกรรมศาสตร์
Journal Title	IEEE Transactions on Vehicular Technology
ISSN	0018-9545
Volume / Issue / Pages	Vol.75 \| No.10 \| pp.23507-23073
Published	2026-10-01
Year	2569
Level	ระดับนานาชาติ (SCOPUS)
Quartile	Q1
DOI	10.1109/TVT.2026.3696325
Abstract	N/A
Abstract (EN)	Full-duplex relaying can significantly improve spectral efficiency in vehicular communications, but its practical performance is constrained by residual self-interference (SI) and rapidly time-varying channels. This work proposes a Walsh–Hadamard and null (WHN) pilot with maximum-likelihood (ML)–based channel estimation (CE) for MIMO-OFDM-IM full-duplex relays. Unlike prior designs that prioritize either low complexity or estimation accuracy, the proposed WHN scheme improves the performance–complexity trade-off by leveraging asymmetric pilot intervals and structured orthogonalization. Two widely recognized baselines are considered for comparison: (i) cyclic-shifted Zadoff–Chu (CS-ZC) preamble pilots representing the low-complexity DFT-domain benchmark, and (ii) scattered pilot-and-null (PN) patterns with ML refinement representing the high-accuracy benchmark used in LTE/5 G systems. Results reveal a consistent carrier-to-noise power ratio (CNR)-dependent crossover: WHN outperforms CS-ZC when CNR <inline-formula><tex-math notation="LaTeX">$\geq$</tex-math></inline-formula> 28dB and surpasses PN under moderate-to-high mobility. At 35dB CNR, WHN provides up to 35<inline-formula><tex-math notation="LaTeX">$\%$</tex-math></inline-formula> BER reduction with only 29<inline-formula><tex-math notation="LaTeX">$\%$</tex-math></inline-formula> complexity overhead. A standard-compliant link-budget analysis further indicates non-trivial coverage gains under the evaluated Doppler regimes and considered residual SI model. All simulation assumptions, Doppler profiles, and SI models follow V2X guidelines, and results are validated across multiple random seeds. Overall, WHN offers a complexity-aware CE solution for full-duplex V2X systems.
Keywords (TH)	N/A
Keywords (EN)	Full-duplex relaying self-interference cancellation channel estimation OFDM-IM vehicular communications
Access Level	Open Access (เปิดสาธารณะ)

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https://doi.org/10.1109/TVT.2026.3696325

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