CAJ | 학술논문

针对分簇无线传感器网络提出了一种基于虚拟天线阵列的协作算法.该算法通过节点间的协作来提高网络连通性,所有节点均按照泊松Voronoj网格模型进行分簇,簇首根据通信链路决定是否激活节点协作;若节点协作算法被激活,簇首从其成员中选择适合的节点作为协作节点共同组成虚拟天线阵列.通过协作,可扩展簇间的通信范围从而与远方节点直接通信以避免出现通信覆盖盲区,或者可补偿信道增益以防止由于信道深衰落所导致的传输失败.仿真结果表明,协作算法在通信过程中具有更好的连通性及能量效率,可有效降低接收端的丢包率,维持网络的连通性,从而延长网络的工作时间.
침대분족무선전감기망락제출료일충기우허의천선진렬적협작산법.해산법통과절점간적협작래제고망락련통성,소유절점균안조박송Voronoj망격모형진행분족,족수근거통신련로결정시부격활절점협작;약절점협작산법피격활,족수종기성원중선택괄합적절점작위협작절점공동조성허의천선진렬.통과협작,가확전족간적통신범위종이여원방절점직접통신이피면출현통신복개맹구,혹자가보상신도증익이방지유우신도심쇠락소도치적전수실패.방진결과표명,협작산법재통신과정중구유경호적련통성급능량효솔,가유효강저접수단적주포솔,유지망락적련통성,종이연장망락적공작시간.
In order to improve network connectivity in clustered wireless sensor networks, a node cooperative algorithm based on virtual antenna arrays is proposed. All the nodes in the network are assumed to be clustered via Poisson Voronoi tessellation (PVT). The activation of the node cooperative algorithm is determined by the cluster heads (CHs) according to communication links. When the cooperative algorithm is activated, the CH selects cooperative nodes (CNs) from its members to form a virtual antenna array. With the cooperation, nodes can extend the inter-cluster communication range to directly contact with further nodes after a coverage hole is detected, or compensate for channel gains while inter-cluster transmission fails due to deep channel fading. Simulation results show that the proposed algorithm achieves better network connectivity and energy efficiency. It can reduce outage probability, sustain network connectivity and maintain operations as long as possible, which prolongs network operation time.