Evolution of STBC-based OFDM-IM for wireless vehicular communication

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dc.contributor.authorMata, Tanairat
dc.contributor.authorBoonsrimuang, Pisit
dc.date.accessioned2026-08-06T10:53:56Z
dc.date.available2026-08-06T10:53:56Z
dc.date.issued2026-01-01
dc.description.abstractThis paper studies wireless vehicular communication (VehCom) in intelligent transportation systems using an orthogonal frequency division multiplexing with index modulation (OFDM-IM). In the concept of IM, data is transmitted not only through the modulated symbols but also via the indices of the active subcarriers. In contrast to the original OFDM, OFDM-IM activates only non-zero subcarriers, increasing energy efficiency. However, the pilot-assisted channel estimation (CE) method is a significant challenge in OFDM-IM, where the desired pilot subcarrier interval is related to the OFDM-IM subblock length. This paper proposes a walsh-scattered pilot-assisted CE for OFDM-IM VehCom. The optimum walsh-scattered pilot assignment is proposed to improve the transmission efficiency. Furthermore, a space-time block code with a high transmit diversity gain is employed for OFDM-IM VehCom to enhance VehCom's signal quality. The results show that the proposed method performs higher CE accuracy and better bit-error rate with significant spectral and energy efficiencies than conventional methods.
dc.identifier.citationChina Communications, 23(2), 51-68, 2026
dc.identifier.doi10.23919/JCC.fa.2024-0326.202602
dc.identifier.issn16735447
dc.identifier.other2-s2.0-105032788673
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/17696
dc.sourceChina Communications
dc.subjectindex modulation
dc.subjectintelligent transportation systems
dc.subjectpilot-assisted channel estimation
dc.subjectspace-time block code
dc.subjectwireless vehicular communication
dc.titleEvolution of STBC-based OFDM-IM for wireless vehicular communication
dc.typeArticle

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