基於多重存取和多重資源的隨機存取通訊系統

Random Access Communications based on Multiple Access and Multiple Resources

林梵勳(Fan-Hsun Lin)

指導教授 ： 林茂昭 ； 李世凱

國立臺灣大學/電機資訊學院/電信工程學研究所/碩士(2024年)

https://doi.org/10.6342/NTU202402757

摘要

非正交的多重接取（NOMA）已被提議用來取代未來通信系統中的正交多重存取。一般而言，一些此領域知名的研究可以分為功率領域NOMA、碼域NOMA和混合NOMA。

分增益多重存取（GDMA）是將功率領域NOMA概念延伸至不僅僅考慮功率也考慮相位。在GDMA中，多個用戶可以共享單一資源，並且通過利用其不同的通道增益來區分接收到的信號中嵌入的傳送信號。

低密度簽名碼分碼多重存取（LDS-CDMA）及近期所提出的高密度簽名碼分碼多重存取（HDS-CDMA）可以歸類為碼域NOMA。此外，這些多重存取技術還可以與低密度奇偶檢查（LDPC）碼和正交頻分多工（OFDM）結合使用。

隨機接取（Random Access）是無線通訊中的一部份，本文依據先前文獻所提出的透過分增益多重存取技術結合ALOHA的系統(OFDM-GDMA-ALOHA)和高密度簽名碼分碼多重存取技術結合ALOHA的系統(OFDM-HDS-ALOHA)進行結合並拓展。此外，我們考慮了一些重傳機制並對數據包的重傳次數設置了限制。

關鍵字

分增益多重接取 ； 低密度簽記 ； 高密度簽記 ； 隨機存取

並列摘要

Gain Division Multiple Access (GDMA) extends the concept of power domain NOMA. Users simultaneously access the same resource and can be distinguished by leveraging their different channel gains.

Low-Density Signature Code Division Multiple Access (LDS-CDMA) and the recently proposed High-Density Signature Code Division Multiple Access (HDS-CDMA) are code domain NOMA. Additionally, these multiple access techniques can be combined with Low-Density Parity-Check (LDPC) codes and Orthogonal Frequency Division Multiplexing (OFDM).

Random Access is a part of wireless communications. This thesis focuses on the systems combining GDMA technology with ALOHA (OFDM-GDMA-ALOHA) and HDS-CDMA technology with ALOHA (OFDM-HDS-ALOHA). Moreover, we consider some retransmission mechanism and set a limit on the number of packet retransmissions. The situation with finite buffer is also studied.

並列關鍵字

GDMA ； LDS-CDMA ； HDS-CDMA ； ALOHA system ； Random access

參考文獻

References

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