基於 IEEE802.11ax 規格之軟體無線電實現與分析

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姓名

藍方妤(FUNG-YU LAN) 查詢紙本館藏

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通訊工程學系

論文名稱

基於 IEEE802.11ax 規格之軟體無線電實現與分析
(Implementation and Analysis of Software Radio Based on IEEE802.11ax Specification)

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至系統瀏覽論文 (2025-12-31以後開放)

摘要(中)

近年來人們對網路的依賴，造成了網路與生活越來越緊
密，WiFi 和行動網路也隨之推陳出新，因此對於 wifi 的研究與理
解是很重要的！現今較為普及的新一代 Wi-Fi 為 Wi-Fi 6 也被稱作
「5G Wi-Fi」，因為過去的 Wi-Fi 一般都是採用 2.4GHz 頻段，如今
可以在更高的頻段 5GHz 運行，使得穩定度提高，OFDMA 也讓傳
輸速率提升。此篇論文將著重研究 Wi-Fi 6，也就是 802.11ax 規格，
來進行模擬完整的收發機，也會使用軟體定義無線電平台（SDR）
分別做傳接收，來模擬在真實通道下訊號的完整解調過程，提供
的最高天線數為四乘四，除了完整的系統模擬，本篇論文也將會
探討傳送端是否有使用空時分組編碼（Space-time block code, 縮寫
i
STBC）對於解調結果造成的影響。隨著人們對於無線通訊研究的
積極投入，Wi-Fi 7 也即將於 2023 年問世，本篇論文也會簡易的介
紹 Wi-Fi 7 與 Wi-Fi 6 的不同之處，以及主要的發展重點，期待今
後的技術能夠有重大突破，再次帶領人們進入下個 Wi-Fi 世代。

摘要(英)

In recent years, people’s dependence on the Internet has caused
the Internet and life to become more and more closely connected, and
WiFi and mobile networks have also been introduced. Therefore, the
research and understanding of wifi is very important! The new generation
of Wi-Fi that is more popular today is Wi-Fi 6, also known as ”5G Wi-Fi”, because in the past Wi-Fi generally used the 2.4GHz frequency band,
but now it can operate at a higher frequency band of 5GHz, making The
stability is improved, and Ofdma also increases the transmission rate.
This paper will focus on the study of Wi-Fi 6, which is the 802.11ax
specification, to simulate a complete transceiver. It will also use the
software-defined radio platform (SDR) to perform transmission and reception
separately, to simulate the complete solution of the signal in a
real channel. During the tuning process, the maximum number of antennas provided is four times four. In addition to the complete system simulation, this paper will also discuss whether the use of space-time block
codes (Space-time block code, abbreviated as STBC) at the transmitter
has any impact on the demodulation results. Impact.
With people’s active investment in wireless communication research,
Wi-Fi 7 will come out in 2023. This paper will also briefly introduce the
differences between Wi-Fi 7 and Wi-Fi 6, as well as the main development points. We look forward to major breakthroughs in future technologies that will once again lead people into the next Wi-Fi generation

關鍵字(中)

★ IEEE802.11AX
★ 正交分頻多工
★ 空時分組編碼
★ 多輸入多輸出

關鍵字(英)

★ IEEE802.11AX
★ OFDMA
★ STBC
★ MIMO

論文目次

中文摘要 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
英文摘要 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
致謝辭 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
目錄 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
圖目錄 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
第 1 章序論 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 簡介 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 章節架構 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
第 2 章系統設計與模型 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 系統介紹 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1.1 OFDM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1.2 OFDMA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.3 MIMO-OFDM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.2 802.11AX 標準 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.2.1 preamble 架構 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.2.2 子載波配置 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.3 傳送端及接收端架構 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.3.1 傳送端 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.3.2 接收端 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.4 軟體定義無線電 (SDR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
第 3 章同步估計 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.1 符元時間同步 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.1.1 Coarse Synchronization Algorithm . . . . . . . . . . . . . . . . . . . . 27
3.1.2 Fine Synchronization Algorithm . . . . . . . . . . . . . . . . . . . . . . 29
3.2 載波頻率同步 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.2.1 Coarse CFO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.2.2 Fine CFO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
第 4 章通道估計 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.1 CHANNEL ESTIMATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.1.1 LS Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.1.2 MMSE Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4.1.3 WIFI6 的通道估計 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
4.2 通道等化器 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
第 5 章空時分組碼 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
第 6 章系統模擬結果與分析 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
6.1 模擬環境一:MATLAB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6.2 模擬環境二:SDR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
6.2.1 SDR 相距 5CM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
6.2.2 SDR 相距 2 公尺 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
6.3 結果分析 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
第 7 章WIFI 7 與未來展望. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
參考文獻 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

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指導教授

張大中(Dah-Chung Chang)

審核日期

2023-8-14

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