| To meet the requirements of the fifth-generation (5G) mobile communication technology with respect to the communication system resource utilization and data transmission rate, Device-to-Device (D2D) communication will be emerged. D2D will be one of the most important communication ways for 5G system. At the same time, the research on the D2D channel characteristic and models are hot topics in worldwide now.The main contents and the contributions of the thesis are as follows:Firstly, the thesis studies the impact of the wireless mobile channel on the receiving signals, in which the small-scale multipath fading is studied. Moreover, the channel mechanism, frequency selective and flat fading channel models are investigated in this work.Secondly, the receivng signal amplitude distributions of indoor scatterers with random distribution have been investigated, based on the theoretical and experimental researches On indoor Device-to-Device (D2D) radio channels, the signal amplitude distributions in D2D indoor radio channels are investigated.Thirdly, the work focuses on the Doppler spectrum studies in D2D radio channel. In the two-and three-dimensional (2-D and3-D) scattering environments, when the angle-of-arrivals (AoAs) of the radio waves are in different angular ranges and follow different probability-density-functions (PDF), the Doppler spectrum distributions can be changed a lot. Meanwhile, the simulation results fit into the measurements very well.The major conclusions of this thesis are as follows:the signal amplitudes can follow single-, double-, and multiple-Rayleigh distributions in different indoor scenarios. Different distributions of the AoAs in the azimuth and elevation planes result in different Doppler spectrum distributions in 2D and 3D scattering environments. The correctness of the simulation results is tested with the measurements. The studies of the D2D wireless channel characteristics are important in the link and system level simulations for future new radio systems. |
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