IQview 使用说明.ppt

Software operation-IQ Signal Analyzing Graph Options Software operation-IQ Signal Analyzing Graph Options-Amplitude Amplitude顯示隨時間變化的信號振幅. 圖形顯示的是瞬時 power 和每段時間的peak power Software operation-IQ Signal Analyzing Graph Options-Spectrogram Spectrogram顯示的是對於給定的頻率,Power隨TIME的變化圖形. 顏色表示的是信號強度。Red表示信號強，Green表示信號弱。 Software operation-IQ Signal Analyzing Graph Options-PSD PSD-Power Spectrum Density︰ 以dBm/BW為單位，BW指帶寬（如100kHZ），這裡的帶寬為224kHZ Software operation-IQ Signal Analyzing Graph Options-Spectrum Mask Spectrum Mask是反映對別的頻道干擾的可能性的參數 Software operation-IQ Signal Analyzing Graph Options-CCDF CCDF 曲線的 x 軸（測量單位：分貝）代表輸入或輸出訊號功率，其中 0 分貝代表平均輸入訊號功率。y 軸代表遇到具有給定功率電平的樣本的可能性 Software operation-IQ Signal Analyzing Graph Options-Symbol Const Symbol Constellation:The Symbol Constellation graph shows the quality of the demodulated data in the complex plane for each symbol in the analyzed frame. xqhaddxu: 星座圖是通過一個複雜平面內的每個點來show出每個解調量的狀態，每個點代表一個解調單元 Software operation-IQ Signal Analyzing Graph Options-Spectral Flatness 顯示的是一個基於子載波頻譜的頻譜平整的long training sequence而得來的估計量 Software operation-IQ Signal Analyzing Graph Options-LO(DC) Leakage It shows the energy level of the carriers relative to that of the center carrier，以2dB為臨界值 Software operation-IQ Signal Analyzing Graph Options-Phase Noise(PSD) Phase Noise:以dBc/Hz為單位 Software operation-IQ Signal Analyzing Graph Options-Phase Error Phase Error-以degree為單位 Software operation-IQ Signal Analyzing Graph Options-I/Q signals I/Q Signal:The IQ Signals shows the I and Q signals voltages plotted against time. Software operation-IQ Signal Analyzing Graph Options-STS Pretzel STS Pretzel-Short Training Symbols:這是一個關於I signal(X坐標)和Q signal(Y坐標)的坐標圖，它的形狀受到以下几個因素的影響︰ phase and frequency errors compression and filtering I/Q mismatch Software operation-IQ Signal Analyzing Graph Options-Freq. Error Freq. Error : 藍色軌跡是short training的頻偏 黑色軌跡是long training的頻偏 綠色軌跡是表示兩者的線性關係 Software operation-IQ Signal Analyzing Graph Options-EVM vs. carrier(OFDM) 這裡顯示的是對於資料訊框內所有symb