Application and Channel Measurement of OFDM System

• Main Authors: Yu-Shi Yu, 游育熙
• Other Authors: 馬杰
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/60812163351519820213

碩士 === 元智大學 === 通訊工程學系 === 98 === The channel characteristics inside an automotive vehicle for the IEEE 802.15.3a ultra wide band (UWB) wireless communications system and a digital video broadcasting (DVB-T）signal are measured and analyzed. Both the UWB and DVB-T signals are orthogonal frequency division multiplexing (OFDM) modulation waveforms. A novel UWB channel measurement approach based on chirp pulse sounding signal in an automotive vehicle is proposed. The chirp pulse sounding signal can improve the accuracy of the Gaussian pulse sounding signal to measure the channel impulse response (CIR) of the UWB channel. The measured root mean square (RMS) delay spread and the power delay profile (PDP) of the UWB channel are the same as the values shown in IEEE UWB channel model. Also, test results show that opening the vehicle’s window may change the channel characterization. Moreover, the DVB-T signal measurement in the DTV frequency band of 530~536MHz、542~548 MHz、566~572 MHz、554~560MHz、572~578 MHz and 590~596 MHz divided in 6 bands is carried out using Tektronix RSA-6100A spectrum analyzer. The characteristics of the measured DVB-T signals are compared with the specifications listed in the IEEE standard. The experiment results are used to evaluate whether the unused DTV spectrum can be dynamically accessed by non-license users.