混合中继转发机制下的资源分配

在基于放大转发（AF）和译码转发（DF）的混合中继转发机制模型下，为了使系统获得最大和速率，提出了相应的资源分配方案，在子载波对混合中继协议的判断选择和最优功率分配算法的基础上讨论了等效信道增益模型和非等效信道增益模型。在非等效信道增益模型中，为了降低计算复杂度提出了一种次优算法。在该机制模型下，系统自适应地选择AF或者DF转发，既克服了两种单一转发模式存在的弊端，又能获得更大的和速率，从而提高了资源利用率。仿真结果表明，当系统功率等因素变化时，该分配方案下的混合中继转发模型与传统的AF和DF模型相比系统和速率分别提高了60%和8%以上，充分说明了该系统的优越性。

Resource allocation for hybrid relay systems

In order to maximize the system sum-rate,a corresponding resource allocation scheme is proposed based on the hybrid relay systems which employ the amplify-and-forward(AF) and decode-and-forward(DF) protocols simultaneously. Then based on the selection of subcarriers to the hybrid relays and power allocation,the equivalent channel gain model and non-equivalent channel gain model are proposed. A suboptimal algorithm is presented to trade off performance for computational complexity in the non-equivalent channel gain model. In hybrid relay model,the system can select AF or DF adaptively,which not only overcomes the disadvantages of the single model,but also improves the system sum-rate and the resource utilization rate. Simulation results demonstrate that the proposed scheme has improved more than sixty percent and eight percent in sum-rate compared with the two conventional cooperative schemes,which shows the good performance of the model.