【摘要】 针对矿井巷道复杂受限环境中电磁波传播多径衰落问题,基于多波模信道模型,建立了矿井巷道放大转发(amplifying-and-forwarding,AF)协作通信系统模型,分别推导出矿井巷道单中继和多中继AF协作通信系统的信道容量公式。考虑矿井巷道内的本质安全要求,在系统总功率和各节点功率双重受限的条件下,以信道容量为优化准则,分别提出了矿井巷道AF协作通信系统单中继和多中继环境的功率分配方法,并进行了仿真比较。实验证明,本方法能够显著提升系统的信道容量;系统总功率的大小影响功率分配方法对信道容量的优化效果和优化幅度:在一定总功率范围内,功率分配方法对信道容量的优化效果随着总功率的增加而减小,功率分配方法对信道容量的优化幅度随着总功率的增加而增加。更多还原

【Abstract】 For multipath fading problem of electromagnetic wave propagation in mine tunnel,which is the complex and space-limited environment,the mine tunnel amplifying-and-forwarding(AF)cooperative communication system was established on the basis of the multimode channel model,and the formulas of channel capacity of the systems with single relay and multiple relays were deduced separately.Taking into consideration the intrinsic safety requirements of mine tunnel,power allocation methods which can optimize the channel capacity were put forward for mine tunnel AF cooperative communication systems with single relay and multiple relays under dual power limitation,total power of the system and power of each node.The simulation and comparison were done as well.The proposed power allocation methods of mine tunnel AF cooperative communication system can significantly improve the channel capacity.The optimal effect and optimal amptitude of the channel capacity are influenced by the total power:in a certain range of the total power,the optimal effect of the channel capacity decreases with the increase of the total power,while the optimal amplitude increases.更多还原