基于能量收集技术的无线协作网络中继选择

针对目前能量收集技术能够收集到的可用能量受限,导致无线协作网络中继节点处易出现能量短板的问题,为了避免整个网络因中继节点大量死亡而瘫痪,提出了一种基于能量收集技术的无线协作网络中继选择方案,即联合最大能量和最大数据传输链路的中继选择方案。首先,基于节点的能量收集状况,选出每跳中能量最大的节点进行解码转发;然后,结合每连续两跳的链路传输状态,选出与源节点和目的节点之间的数据传输信道最优者作为中继节点。结合Nakagami-m信道衰落模型,将该方案与随机选择方案、最大数据链路信道增益(MaDs)方案和基于中继-窃听链路最小信道增益(BNBF)方案进行对比分析,结果表明:在满足收集的能量足够用于下一时隙能量收集和数据传输的前提下,用于能量收集的比例越小,网络中断概率越小;联合最大能量和最大数据传输链路的中继选择方案在网络中断性能方面优于其他方案,其中断概率随信噪比的增大而减小,特别是当平均信噪比为38dB时,网络中断概率降到10^-5。

Relay selection in wireless cooperative networks based on energy collection technology

In view of problem that available energy collected by current energy collection technologies is limited which leads to energy shortboards at relay nodes in wireless cooperative networks,in order to avoid paralysis of the entire network due to large number of deaths of relay nodes,a relay selection scheme in wireless cooperative networks based on energy collection technology,namely a relay selection scheme for combined maximum energy and maximum data transmission link was proposed.First,based on energy collection status of the nodes,the node with the highest energy in each hop is selected for decoding and forwarding;then,based on link transmission status of each two consecutive hops,the relay node is selected which can optimize the data transmission channel between the source node and the destination node.Combined with Nakagami-m channel fading model,the proposed scheme is compared with the random selection scheme,MaDs scheme and BNBF scheme.The results show that under the premise that the collected energy is sufficient for energy collection and data transmission in the next time slot,the smaller the proportion of energy collection used,the smaller the probability of network interruption;the relay selection scheme that joints maximum energy and maximum data transmission link is superior to other schemes in terms of network interruption performance,its interruption probability decreases as the signal-to-noise ratio increases,especially when the average signal-to-noise ratio is 38 dB,the network interruption probability drops to 10^-5.