衛星網路之基於空間多樣性的前導訊號設計;Spatial Diversity Based Preamble Design in Non-Terrestrial Networks

NCUIR > College of Electrical Engineering & Computer Science > Graduate Institute of Computer Science and Information Engineering > Electronic Thesis & Dissertation > Item 987654321/93387

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/93387

Title:	衛星網路之基於空間多樣性的前導訊號設計;Spatial Diversity Based Preamble Design in Non-Terrestrial Networks
Authors:	洪紫瑄;Hung, Tzu-Hsuan
Contributors:	資訊工程學系
Keywords:	衛星通訊;隨機接入;前導訊號設計;都卜勒偏移;上行鏈路;分散式;Satellite Communication;Random access;Preamble Design;Doppler shift;Uplink;Distributed
Date:	2023-07-31
Issue Date:	2024-09-19 16:56:55 (UTC+8)
Publisher:	國立中央大學
Abstract:	由於低地球軌道衛星環境具有長傳播延遲和高移動性等特點，對於前導設計需要考慮時序提前和載波頻率偏移。為了處理頻率偏移對時序估計造成的影響，前導訊號廣泛採用具有多個根的 Zadoff-Chu (ZC) 序列。然而，這樣的前導訊號會受到非正交干擾的影響。我們採用空間多樣性來設計區域特定的前導訊號的樣式以有效緩解 NOI，並且能夠在大的頻率偏移環境下進行時序估計。我們提出的前導訊號設計可以達到更高的接入率，並且在頻率偏移較大或多個用戶同時訪問的情況下也能保持良好效果。;Due to the features of low earth orbit (LEO) satellite environment, such as long propagation delays and high mobility, the preamble design needs to consider the large timing advance and carrier frequency offset (CFO). To handle the adverse impact of CFO on the timing detection, preambles constructed using Zadoff-Chu (ZC) sequence with multiple roots are widely considered. However, such preambles suffer from the non-orthogonal interference (NOI). We adopt spatial diversity to develop region specific preamble patterns to effectively mitigate NOI and estimate timing advance under the large CFO environment. Our proposed preamble design achieves high access rate, even in scenarios with large CFO or when multiple users access simultaneously.
Appears in Collections:	[Graduate Institute of Computer Science and Information Engineering] Electronic Thesis & Dissertation

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