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以蜂窝网的下行线路为例,描述了不采用协作、多用户协作、基于最优用户选择的多用户协作、多中继协作和基于最优中继选择的多中继协作等五种模式的具体场景和时隙分配示意图,给出了五种模式下的基站和目的用户之间的互信息和一帧内所消耗的总能量。对五种模式下中断概率进行了数值仿真。理论分析和仿真结果表明,多用户协作能获得较大的分集增益,而多中继协作的能量效率较高。信噪比受限条件下,无论多用户协作还是多中继协作,采用协作选择技术后,能量效率更高。
Taking the downlink of a cellular network as an example, it describes five modes that do not adopt cooperation, multi-user cooperation, multi-user cooperation based on optimal user selection, multi-relay cooperation and multi-relay cooperation based on optimal relay selection Specific scenarios and time slot allocation diagram shows the mutual information between the base station and the destination user in five modes and the total energy consumed in one frame. The simulation of the probability of outage in five modes is carried out. The theoretical analysis and simulation results show that multi-user cooperation can achieve a large diversity gain, while multi-relay cooperation has higher energy efficiency. With limited signal-to-noise ratio, no matter how multi-user cooperation or multi-relay cooperation, the energy efficiency is higher when collaborative selection technology is used.