Abstract
This paper presents the performance evaluation of a portable digital radiophone influenced by the operator's body in urban mobile environments, based on the EVM (error vector magnitude) and BER (bit error rate) simulation. The type of digital modulation follows to the NADC-TDMA standard. A new probability density function (pdf) is proposed to describe the statistic of the EVM in an AWGN channel under frequency non-selective slowly fading situation. The simulation combines the modified Doppler power spectrum (MDPS) method and a gray coding (π/4-DQPSK modulation with square-root raised cosine (SRRC) shaping filter. The performance evaluation based on BER uses an ideal matched-filter-based receiver. The results show that the closer of the distance between the radiophone antenna and the operator's head, the poorer of the EVM and BER performance.
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