Multicarrier Spread Spectrum Communications with Noncontiguous Subcarrier Bands for HF Skywave Links
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| Format: | Preprint |
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2024
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| _version_ | 1866910604352028672 |
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| author | Hunt, Brandon T. Moradi, Hussein Farhang-Boroujeny, Behrouz |
| author_facet | Hunt, Brandon T. Moradi, Hussein Farhang-Boroujeny, Behrouz |
| contents | Growing traffic over the high-frequency (HF) band poses significant challenges to establishing robust communication links. While existing spread-spectrum HF transceivers are, to some degree, robust against harsh HF channel conditions, their performance significantly degrades in the presence of strong co-channel interference. To improve performance in congested channel conditions, we propose a filter-bank based multicarrier spread-spectrum waveform with noncontiguous subcarrier bands. The use of noncontiguous subcarriers allows the system to at once leverage the robustness of a wideband system while retaining the frequency agility of a narrowband system. In this study, we explore differences between contiguous and noncontiguous systems by considering their respective peak-to-average power ratios (PAPRs) and matched-filter responses. Additionally, we develop a modified filter-bank receiver structure to facilitate both efficient signal processing and noncontiguous channel estimation. We conclude by presenting simulated and over-the-air results of the noncontiguous waveform, demonstrating both its robustness in harsh HF channels and its enhanced performance in congested spectral conditions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_09723 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Multicarrier Spread Spectrum Communications with Noncontiguous Subcarrier Bands for HF Skywave Links Hunt, Brandon T. Moradi, Hussein Farhang-Boroujeny, Behrouz Signal Processing Growing traffic over the high-frequency (HF) band poses significant challenges to establishing robust communication links. While existing spread-spectrum HF transceivers are, to some degree, robust against harsh HF channel conditions, their performance significantly degrades in the presence of strong co-channel interference. To improve performance in congested channel conditions, we propose a filter-bank based multicarrier spread-spectrum waveform with noncontiguous subcarrier bands. The use of noncontiguous subcarriers allows the system to at once leverage the robustness of a wideband system while retaining the frequency agility of a narrowband system. In this study, we explore differences between contiguous and noncontiguous systems by considering their respective peak-to-average power ratios (PAPRs) and matched-filter responses. Additionally, we develop a modified filter-bank receiver structure to facilitate both efficient signal processing and noncontiguous channel estimation. We conclude by presenting simulated and over-the-air results of the noncontiguous waveform, demonstrating both its robustness in harsh HF channels and its enhanced performance in congested spectral conditions. |
| title | Multicarrier Spread Spectrum Communications with Noncontiguous Subcarrier Bands for HF Skywave Links |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2409.09723 |