隧道無線協(xié)作通信系統(tǒng)容量與性能優(yōu)化
[Abstract]:The tunnel space is limited, narrow and there are branches, bends and ramps, and so on. The multipath fading effect of electromagnetic wave propagating in the tunnel is serious, which is the key problem to restrict the performance of the tunnel wireless communication system. Cooperative communication can improve the wireless communication performance of tunnel by utilizing multi-path fading without increasing the number of antennas in each node. In this paper, the capacity and performance optimization of tunnel wireless cooperative communication system is studied. Virtual MIMO, based on relay collaboration is used to enhance the anti-multipath fading capability. Firstly, the tunnel wireless communication channel model is established. By increasing the rough loss factor of the tunnel, the multi-mode model is modified, and the multi-mode modified channel model is established to synthesize the tunnel wall scattering loss. The propagation characteristics of electromagnetic wave in tunnel are simulated by using multi-mode modified channel model. The simulation results are in good agreement with the measured results. The multimode modified channel model is simplified, and the near region model and the far region model are established, and the rationality of the model is verified by simulation. Secondly, based on the multi-mode modified channel model, a tunnel single-relay cooperative communication system model is established, and a tunnel single-relay cooperative communication power allocation method, cooperative mode selection method and relay location selection method based on channel capacity optimization are proposed. The power allocation method for maximizing channel capacity in AF and DF cooperative mode is derived. The simulation results show that the channel capacity in AF mode and DF mode can be increased by 15-38% and 20-65% respectively under dual power constraints. A method for selecting cooperative mode of V-SISO and V-SIMO tunneling cooperative communication systems is proposed. The formula of optimal location of relay nodes in different cooperative modes is given. Thirdly, the model of tunnel multi-relay cooperative communication system is established, and the performance optimization method of tunnel multi-relay cooperative communication system is proposed. In the case of dual power constraints, the AFPAGA algorithm and the DFMKPA algorithm are proposed based on the channel capacity optimization criterion and multiple relay nodes participate in the cooperation, and the optimal power allocation methods in different cooperative modes are given. The simulation results show that the channel capacity optimization effect is more obvious when the total power is small. A joint optimization method of relay selection and power allocation is proposed to reduce the outage probability of tunnel cooperative communication system. Finally, the distributed beamforming is adopted at the relay end of the tunnel multi-relay cooperative communication system, and the model of the tunnel cooperative beamforming communication system is established. A joint power allocation and beamforming method based on channel capacity optimization is proposed to improve the channel capacity of the system. A joint relay selection and beamforming method for tunnel cooperative communication based on predetermined channel power gain threshold is proposed. The channel capacity and bit error rate (BER) which are very similar to those of all relay nodes involved in cooperative beamforming are obtained. The complexity of beamforming at the relay end is reduced. The research in this paper is helpful to improve the reliability and effectiveness of tunnel wireless communication, and provide theoretical support and technical support for the flexible construction of real-time, long distance, reliable and efficient tunnel security monitoring and emergency rescue system.
【學(xué)位授予單位】:中國礦業(yè)大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2015
【分類號】:TD65
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