摘要
为了增大网络寿命,降低误符号率,优化无直传链路协作通信系统的性能,本文提出基于接收信噪比和网络寿命的最优中继选择算法。由于网络寿命的问题无法直接求解,将其转化为中继节点剩余能量与目的节点达到接收信噪比门限时发射功率的比值。首先计算各个中继在目的节点的接收信噪比,将大于信噪比门限加入候选中继,然后依次计算候选中继的联合优化函数值并排序,值最大者即为最优中继。理论推导了系统误符号率的上下界,仿真表明理论值与仿真值较为吻合,验证了系统在保证较低误符号率的基础上延长了网络寿命。
In order to extend the network life, decrease symbol error rate （SER） and optimize the performance of cooperative communication system which without direct transmission link, optimal relay selection algorithm based on receiving signal-to-noise ratio （SNR） and network life is proposed. Network lifetime is converted to the ratio of the energy left and the power of the relay node when the destination reaches the receiving threshold SNR since direct treatment for the network lifetime is not feasible. First, the receiving SNR at the destination for each relay is calculated. Putting the relay in the candidate relay set when its receiving SNR is greater than the threshold SNR. Then calculating and sorting the joint optimization function values for each candidate relay, and the relay who has the biggest value is the optimal relay. The up and low bound of the system SNR are derived and the simulation value is consistent with the theoretical value. At the same time, the simulation also verified the case that the network life is extended on the base of lower SER.
出处
《电信科学》
北大核心
2012年第7期75-79,共5页
Telecommunications Science
关键词
协作通信
中继选择
网络寿命
接收信噪比
误符号率
cooperative communication, relay selection, network life, receiving SNR, SER
