正交分頻多工調變(Orthogonal Frequency Division Multiplexing, OFDM) 技術隨著無線通訊傳輸發展，也應用的非常廣泛。 本篇論文參考IEEE 802.11ax 標準，設計一套1X8 的OFDM 傳輸 系統，應用在工研院自主研發之軟體定義無線電(Software Defined Radio, SDR) 平台M3FORCE E1000 上的收發機架構來模擬Wifi6 傳 輸。利用前導訓練序列(Preamble) 解決在高效率傳輸系統下，接收 端時序同步、載波頻率飄移的問題，並且結合了歸一化最小均方 (Normalized least mean squares, NLMS) 的波束成形(Beamforming) 技術強化訊號，解決多路徑通道干擾的問題。從結果上來看，相 比於一傳一收的系統，使用八根天線接收並且結合波束成形技術會有更好的效能。;With the development of modern wireless communication technologies, the Orthogonal Frequency Division Multiplexing (OFDM) technology is widely used. This thesis refers to the IEEE 802.11ax standard and designs a 1X8 OFDM transmission system, which is applied to a transceiver architecture designed on the Software Defined Radio (SDR) platform M3FORCE E1000, independently developed by ITRI, to implement the WiFi-6 transmission. The preamble training sequence is used to solve the problems of timing synchronization and carrier frequency offset at the receiver in a high-efficiency transmission system, and the normalized least mean square beamforming technology is combined to strengthen the signal and solve the problem of inter channel interferences.From the simulation and realization results, compared with the T1R1 system, we implement up to eight RX antennas for digital beamforming to evaluate the system performance.
