放大转发中继器降低发射功率的选择策略研究

Research on selection strategy of reducing transmit power by amplifying forward repeater

文章针对传统多中继放大转发协作通信网络中所有潜在中继均参与协作,导致系统所需发射功率增加的问题,提出了一种中继节点选择策略。该策略以最小化系统中断概率为目标,引入了中继节点的选择门限,并据此逐一令低于门限的中继节点不参与协作,将其资源重新分配给其他节点,从而降低系统整体所需发射功率。中继节点选择策略运算开销小,且选择门限只与中继节点数、平均信道增益以及当前系统信噪比有关,可在传输开始前确定而无需实时更新,从而节省了系统开销。仿真实验表明,在相同的信噪比条件下,该策略在满足一定的中断概率条件下,可以有效降低发射功率。

Aiming at the problem that all potential relays in traditional multi-relay amplification and cooperative communication networks are involved in cooperation, resulting in increase of the transmission power of the system, this article proposes a relay node selection strategy. In order to minimize the probability of system outage, this strategy introduces the selection threshold of relay nodes with the relay nodes below the threshold not involved in the collaboration, and reallocates resources to other nodes to reduce the overall transmit power required by the system. The calculation cost of the relay node selection strategy is small, and the selection threshold is only related to the number of relay nodes, the average channel gain and the current system signal-to-noise ratio, and can be determined before the start of transmission without being updated in real time, thereby saving system overhead. Simulation results show that under the condition of the same signal-to-noise ratio, the proposed method can effectively reduce the transmission power under the condition of certain interruption probability.