瑞利衰落信道下非正交选择转发协议遍历容量

Ergodic capacity of opportunistic non-orthogonal forward protocol over Rayleigh fading channel

为了研究瑞利衰落信道下非正交选择放大转发协议和非正交选择译码转发协议的遍历容量,推导出这两种转发协议下遍历容量界的闭式表达式,蒙特卡罗仿真得到了两种协议在不同备选中继个数时的遍历容量.仿真结果表明两种协议的遍历容量随备选中继个数的增加而改善,当中继个数增加到一定值时,这种改善趋缓;相对而言,低信噪比时非正交选择放大转发协议的遍历容量较大,高信噪比时非正交选择译码转发协议的遍历容量较大.

To obtain the ergodic capacity of opportunistic non-orthogonal amplify-and-forward forward protocol and opportunistic non-orthogonal decode-and-forward protocol over Rayleigh fading channels, the closed expressions for the ergodic capacities under the two protocols were deduced, and the values of the ergodic capacity was given through Monte-Carlo simulation. The results show that the ergodic capacity′s values of the two protocols will improve along with relay node number increasing, and the improvement tendency will hasten delay when the relay node number arrives to a certain value. The opportunistic non-orthogonal amplify-and-forward forward protocols could obtain a larger ergodic capacity value at lower SNR（signal noise ratio）, while the opportunistic non-orthogonal decode-and-forward protocol has a better ergodic capacity performance at higher SNR.