正交分頻多工（Orthogonal Frequency Division Multiplexing， OFDM）具備高頻譜效率與明確的子載波結構，適合延伸至通訊與感測整合應用。本研究參考 IEEE 802.11be（Wi-Fi 7）之主要 OFDM 參數，設計並實現一套自定義 OFDM 雷達量測系統，並以 LitePoint IQxel-MX 綜合測試儀作為波形發射、回波擷取與演算法驗證平台。系統採用 160 MHz 與 320 MHz 頻寬，於 5.8 GHz 與 7.2 GHz 載波頻段進行靜態單目標距離量測。 為處理實體收發時的幀起始位置不確定性，本研究以前導 Zadoff-Chu（ZC）序列完成時序同步與資料幀定位；完成 OFDM 符號切片、循環前綴移除及頻域映射後，再以符號共同相位估測降低殘餘載波頻率偏移與本地振盪器相位漂移所造成的符號間相位旋轉，並利用最小平方法整合多個 OFDM 符號之通道頻率響應。此流程建立了由 MATLAB 波形生成、IQxel-MX 射頻發射與接收、I/Q 資料回傳至 MATLAB 後端分析的完整量測鏈。 本研究所使用之 IQxel-MX 綜合測試儀器涵蓋 400 MHz 至 7.3 GHz 的射頻操作範圍，並提供 480 MHz 即時分析頻寬。接收資料分別採用 FFT-based 距離估測（距離向 IFFT 法）與能量估計法進行分析。前者由通道頻率響應之子載波相位斜率形成距離響應，並搭配共同相位校正、頻域加窗、中央零填補與三點拋物線內插；後者則利用直達路徑與主要反射路徑所形成的頻域通道能量週期估測超額延遲，再依準單基地幾何換算目標距離。 實驗於 1 m 至 15 m 範圍內完成四組條件、共 600 筆重複量測。能量估計法於 5.8 GHz／BW160、5.8 GHz／BW320、7.2 GHz／BW160 與 7.2 GHz／BW320 條件下之平均絕對誤差分別為 0.071 m、0.100 m、0.169 m 與 0.137 m；FFT-based 距離估測之平均絕對誤差分別為 0.164 m、0.170 m、0.174 m 與 0.174 m。結果證實，本研究之 IQxel-MX 架構可作為參考 IEEE 802.11be 主要 OFDM 參數之高頻寬靜態單目標測距與演算法驗證平台；惟目前尚未執行慢時間都卜勒 FFT，因此實測結果不代表完整距離－都卜勒成像能力。 此外，本研究另以 IEEE 802.11be EHT 標準 PPDU 進行延伸測距驗證，於 5 m 與 10 m、BW160 與 BW320 條件下，透過標準封包偵測、載波頻率偏移校正與 EHT-LTF 通道估測取得 CFR，並分別導入能量估計法與 FFT-based 距離估測。IQxel-MX 所量得之 OFDM Composite EVM 約介於 −35.935 dB 至 −39.196 dB，結果顯示所建立之量測平台可由自定義 OFDM waveform 進一步延伸至 IEEE 802.11be EHT PPDU 之通道量測與距離估測。;Orthogonal frequency-division multiplexing (OFDM) provides high spectral efficiency and a well-defined subcarrier structure， making it suitable for integrated communication and sensing applications. This study develops a custom OFDM radar measurement system parameterized according to key IEEE 802.11be (Wi-Fi 7) settings. A LitePoint IQxel-MX wireless connectivity tester is used as the platform for waveform transmission， echo acquisition， and algorithm verification. Measurements are conducted at carrier frequencies of 5.8 GHz and 7.2 GHz with bandwidths of 160 MHz and 320 MHz for static single-target ranging. To address uncertainty in the received frame start， a Zadoff-Chu (ZC) preamble is used for timing synchronization and frame localization. After OFDM symbol segmentation， cyclic-prefix removal， and frequency-domain mapping， symbol-wise common-phase estimation is applied to reduce inter-symbol phase rotation caused by residual carrier-frequency offset and local-oscillator phase drift. The channel frequency response is then integrated across multiple OFDM symbols using a least-squares estimator. This procedure establishes a complete measurement chain from MATLAB waveform generation and IQxel-MX RF transmission/reception to MATLAB-based I/Q post-processing. The IQxel-MX instrument configuration used in this study covers 400 MHz to 7.3 GHz and provides 480 MHz of real-time analysis bandwidth. The received data are processed using two range-estimation approaches: FFT-based range estimation using a range-domain IFFT， and an energy-based estimation method. The FFT-based method applies common-phase correction， frequency-domain windowing， centered zero-padding， and three-point parabolic interpolation. The energy-based method estimates the excess delay from the periodic channel-energy pattern produced by the direct and dominant reflected paths and converts the delay to range using a quasi-monostatic geometric approximation. A total of 600 repeated measurements are collected over target distances from 1 m to 15 m. For the 5.8 GHz/160 MHz， 5.8 GHz/320 MHz， 7.2 GHz/160 MHz， and 7.2 GHz/320 MHz conditions， the mean absolute errors of the energy-based method are 0.071 m， 0.100 m， 0.169 m， and 0.137 m， respectively， whereas those of the FFT-based method are 0.164 m， 0.170 m， 0.174 m， and 0.174 m. The results demonstrate the feasibility of the IQxel-MX platform for high-bandwidth static single-target ranging and algorithm verification using an OFDM waveform parameterized according to key IEEE 802.11be settings. Because no slow-time Doppler FFT is performed in the experiments， the reported results do not constitute full range-Doppler imaging. In addition， IEEE 802.11be EHT PPDUs are employed for extended ranging experiments at target distances of 5 m and 10 m with 160 MHz and 320 MHz bandwidths. CFRs obtained through standard packet detection， carrier-frequency-offset correction， and EHT-LTF channel estimation are further processed using the energy-based and FFT-based ranging methods. The measured OFDM composite EVM ranges from −35.935 dB to −39.196 dB， demonstrating that the proposed IQxel-MX platform can be extended from custom OFDM waveforms to channel measurement and ranging based on IEEE 802.11be EHT PPDUs.
