Research Article
Hybrid ARQ with Cyclic-Orthogonal Walsh–Hadamard Spreading for Interference-Robust IEEE 802.15.6ma Based WBANs
@INPROCEEDINGS{10.1007/978-3-032-38657-1_33, author={Ruon Takahashi and Kento Takabayashi}, title={Hybrid ARQ with Cyclic-Orthogonal Walsh--Hadamard Spreading for Interference-Robust IEEE 802.15.6ma Based WBANs}, proceedings={Body Area Networks. 20th EAI International Conference, BodyNets 2025, Okayama, Japan, December 2--4, 2025, Proceedings}, proceedings_a={BODYNETS}, year={2026}, month={10}, keywords={Hybrid ARQ Hadamard codes cyclic-orthogonal code sets WBAN IEEE802.15.6 ma}, doi={10.1007/978-3-032-38657-1_33} }- Ruon Takahashi
Kento Takabayashi
Year: 2026
Hybrid ARQ with Cyclic-Orthogonal Walsh–Hadamard Spreading for Interference-Robust IEEE 802.15.6ma Based WBANs
BODYNETS
Springer
DOI: 10.1007/978-3-032-38657-1_33
Abstract
Wireless body area networks (WBANs) are increasingly deployed in medical and healthcare applications, where stringent reliability and latency are required despite dense device coexistence and unpredictable interference. This paper studies a hybrid automatic repeat request (HARQ) scheme tailored to IEEE 802.15.6ma that integrates forward-error-correction (FEC) with selective retransmissions and applies cyclic-orthogonal Walsh–Hadamard codes (COWHC) as spreading sequences to suppress multiple-access interference (MAI) from asynchronous WBANs. We outline the HARQ procedure, detail the construction and properties of the COWHC set, and evaluate performance by packet-error rate (PER) under additive white Gaussian noise (AWGN) with MAI. The results indicate that, for limited retransmission budgets, HARQ with COWHC yields lower PER than conventional ARQ and maintains orthogonality among concurrently active links, thereby improving reliability without excessive retransmissions.