CAJ | 학술논문

通过高信噪比条件下AF双向中继网络总速率的近似表达，给出了链路增益乘积和系统总速率之间的关系式。基于此关系式提出一种最大化链路增益乘积中继选择算法（Maximum Relay Selection，MRS），在中继处引人门限，将链路质量超过门限的中继选出建立可靠候选集。在建立的可靠候选集中以两跳链路增益乘积最大化为标准，实现最佳中继选择。通过仿真将该中继选择算法与现有AF双向中继网络3种不同中继选择算法进行性能比较。仿真结果表明，该中继选择算法能在同时保证AF双向中继网络两跳链路质量的前提下，提高系统的总速率。
통과고신조비조건하AF쌍향중계망락총속솔적근사표체，급출료련로증익승적화계통총속솔지간적관계식。기우차관계식제출일충최대화련로증익승적중계선택산법（Maximum Relay Selection，MRS），재중계처인인문한，장련로질량초과문한적중계선출건립가고후선집。재건립적가고후선집중이량도련로증익승적최대화위표준，실현최가중계선택。통과방진장해중계선택산법여현유AF쌍향중계망락3충불동중계선택산법진행성능비교。방진결과표명，해중계선택산법능재동시보증AF쌍향중계망락량도련로질량적전제하，제고계통적총속솔。
By the approximation expression of sum-rate in two-way AF relay network under a high-SNR condition,the relationship between the sum-rate and the product of two-hop channel gain is given firstly. Secondly, a relay selection scheme named MRS ( Maximum Relay Selection)based on the relationship is proposed:by using threshold at relay nodes,relays whose link quality exceed predetermined threshold will be selected to establish a reliable candidate set; the relay resulting in that the product of two-hop channel gain is maximum will be selected as the best relay from the established reliable candidate set. Furthermore, a performance comparison is realized between the proposed scheme and the other three different schemes. Simulation results show that the proposed relay selection scheme improves the sum-rate on the premise of ensuring the two-hop link quality at the same time.