We analyze the impact of arbitrary dependence between the forward and backward links in backscatter communication systems. Specifically, we quantify the effect of positive and negative dependence between these fading links on channel capacity, using Copula theory. The benefits of this approach are highlighted over the classical framework of linear dependence based on Pearson's correlation coefficient, which is also analyzed. Results show that for a fixed transmit power budget, capacity grows with positive dependence as well as with fading severity in the low signal-to-noise ratio (SNR) regime. Conversely, fading dependence becomes immaterial in the high SNR regime.

翻译：我们分析了后向散射通信系统中前向和后向联系的任意依赖性的影响。具体地说,我们用科普拉理论来量化这些逐渐衰落的连接对频道容量的正负依赖性的影响。这个方法的好处在基于皮尔逊相关系数的线性依赖性传统框架中得到强调,该系数也得到了分析。结果显示,对于固定传输电源预算而言,能力随着正依赖性的增长以及信号到噪音比率低的体系中的下降严重性而增长。相反,下降的依赖性在高国家情报局制度中变得无关紧要。