1 简介
In wireless sensor networks (WSNs),utilizing the unmanned aerial vehicle (UAV) as a mobile data collector for the ground sensor nodes (SNs) is an energy-efficient technique to prolong the network lifetime. Specifically,since the UAV can sequentially move close to each of the SNs when collecting data from them and thus reduce the link distance for saving the SNs transmission energy. In this letter,an efficient iterative algorithm is proposed to find a sub-optimal solution. Numerical results show that the proposed scheme achieves significant network energy saving as compared to benchmark schemes.an efficient iterative algorithm is proposed to find a sub-optimal solution. Numerical results show that the proposed scheme achieves significant network energy saving as compared to benchmark schemes.
2 部分代码
%Energy-Efficient Data Collection in UAV Enabled Wireless Sensor Network Cheng Zhan ,Member,IEEE,Yong Zeng ,Member,IEEE,and Rui Zhang ,Fellow,IEEE% Jongseok Lee,kwangwoon university,seoul,korea.% figure1.(a) and (b)clearallclosealladdpath('./src')globaluq0qFistrain=0ifistrain==1 %% Optimization Q= {}; X= {}; Theta= {}; Lo= {}; forT= [4050100] disp(['T ='num2str(T)',start']) [q,x,th,lo]=solveP1('T',T,'Sk',10*(10^6),'epsilon',10^-2); disp(['T ='num2str(T)',end']) Q=cat(1,Q,{q}); X=cat(1,X,{x}); Theta=cat(1,Theta,{th}); Lo=cat(1,Lo,{lo}); endelse load('./data/Fig1.mat') parameter_setting('Sk',10*(10^6),'epsilon',10^-2);end%% figure 1.(a)figure(11)holdon plot(Q{1}Q{1}'--b',Q{2}Q{2}'-.r',Q{3}Q{3}(2,:),'-k');scatter(u(1,:),u(2,:),'xk');legend('T=40s','T=50s','T=100s');axis([-800800-800800])gridontitle('Fig. 1.(a),UAV trajectory')xlabel('x')ylabel('y')text(q0(1),q0(2),'\leftarrow Initial point');text(qF(1)-300,qF(2),'Final point \rightarrow');fork=1:4 text(u(1,k),u(2,k),['u_{',num2str(k),」；enddrawnow %% figure 1.(b)figure(13)Xr=X{2};t=zeros(4,1);fork=1:4 t(k) =graythresh(Xr(:,k));end t=min(t)*1.2; Xr(Xr>=t) =1; Xr(Xr<t) =0;plot([0:99]*50/99,Xr(:,1),'-r',[0:99]*50/99,Xr(:,2),'--b',[0:99]*50/99,Xr(:,3), ':k',[0:99]*50/99, Xr(:,4), '-.m');legend('SN u_{1}','SN u_{2}','SN u_{3}','SN u_{4}','Location','north','NumColumns',4);axis([ 0 50 0 1.25])title('Fig.1(b), Wake-up schedule (T=50s)');yticks([0 1])yticklabels({'Sleep','Wake-up'})drawnow%% save datasmkdir ./datasave('./data/Fig1.mat', 'X','Q','Theta');
3 仿真结果
4 参考文献
[1] Zhan, C. , Y. Zeng , and R. Zhang . "Energy-Efficient Data Collection in UAV Enabled Wireless Sensor Network." IEEE Wireless Communication Letters PP.99(2017):1-1.