本篇論文主要是針對IEEE 802.16-2004 OFDM基頻訊號的EVM分析 。 基頻訊號的分析流程是利用Delay Correlator以及Cross Correlator完成時序同步之後，經過載波頻率偏移補償、通道估測、取樣頻率誤差估測、相位追蹤到誤差向量幅度的計算，其中並探討量化誤差及峰值對平均能量比對誤差向量幅度的影響。 實測方面分為兩部份，第一組訊號使用Agilent E4438C ESG向量訊號產生器產生一符合802.16-2004的OFDM DL訊號，透過Agilent MXA N9020A訊號分析儀錄製未經補償的基頻訊號，第二組訊號使用商用發射機(WiMax CPE)透過Agilent MXA N9020A訊號分析儀錄製未經補償的基頻訊號，將兩組實測訊號藉由Matlab設計一完整的基頻訊號分析流程來分析訊號並求得EVM，並將分析結果與向量訊號分析儀之結果相互比對。 ;The thesis takes a discussion on EVM in IEEE 802.16-2004 OFDM PHY standard. Use Delay-Correlator and Cross-Correlator to finished the symbol timing synchronization,after that,do the Carrier Frequency Offset Channel Estimation Sampling Clock Estimation and Phase Tracking. Finally, caculate the EVM and discuss the affect on Quantization Error and PAPR. In the actual measurement, first we use Agilent E4438C ESG to generate the Uplink signal which consonant with the standard, and use Agilent MXA N9020A Vector Signal Analyzer to recored the baseband signal then run the analyse process. Finally, we use WiMax CPE to generate the OFDM Downlink signal and also run the analyse process to compare with the first result.
