Computer Simulation of the Operator''s Body Effects on Communication Performance of the Portable Radiophone in Urban Mobile Environments

• Main Authors: Fu-Lin Lin, 林福林
• Other Authors: Huey-Ru Chuang
• Format: Others
• Language: en_US
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/68278084065546565268

博士 === 國立成功大學 === 電機工程學系 === 88 === This thesis presents detailed analysis and computer simulation of the influence of the operator''s body on the performance of the portable radiophone in urban mobile environments. An approach called modified Doppler power spectrum (MDPS) method is proposed to study this problem. This approach combines the cross polarization discrimination (XPD) resulted from randomly-oriented scatterers as well as reflectors, and the cross power patterns induced by the operator''s body. To validate the results of the MDPS method, a second approach called direct discrete multipath (DDM) method is also presented. It assumes that the multipath is discrete, the incident waves are distributed with an uniform distribution, and the polarization angle are distributed with an a-profile probability density function (PDF). Two modulation schemes, digital FM and π/4-DQPSK, are used in the computer simulation. The performance evaluation is based on the error vector magnitude (EVM) and bit error rate (BER). Computer simulation results of communication performance of the portable radiophone influenced by the human body are useful for the antenna/RF design and the link budget consideration of the portable wireless communication systems.