Unified Block Signal Processing Framework for LPWANs: Sequence Index Modulation Spreading
Wenkun Wen, Tierui Min, Long Yuan, Minghua Xia

TL;DR
This paper presents a unified block signal processing framework for LPWANs that enhances multi-user separation and synchronization, supporting various modulation schemes for improved physical-layer efficiency.
Contribution
It introduces a novel generalized block transmission framework with quasi-orthogonal codewords, enabling reliable asynchronous multi-user detection in LPWANs.
Findings
Supports frequency-shift keying and chirp spread spectrum
Enables reliable multi-user separation under asynchronous access
Provides a unified demodulation structure based on block correlation
Abstract
Low-power wide-area networks (LPWANs) demand high receiver sensitivity and efficient physical-layer signal processing. This paper introduces a unified framework for generalized block signal transmission in LPWANs, addressing the limitations of conventional symbol-by-symbol approaches. The framework comprises three key components: the signal block vector, the intra-block structure generator, and the signal basis matrix, and leverages quasi-orthogonal codewords formed through cyclically shifted spreading sequences. The resulting quasi-orthogonality enables reliable multi-user separation, particularly under asynchronous access. The framework establishes a conceptual foundation for block synchronization and provides a unified demodulation structure based on block correlation matching. It further supports flexible and systematic implementation, as demonstrated through applications to…
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Taxonomy
TopicsIoT Networks and Protocols · Advanced Wireless Communication Technologies · Advanced Wireless Communication Techniques
