We investigate the weighted-sum distortion minimization problem in transmitting two correlated Gaussian sources over Gaussian channels using two energy harvesting nodes. To this end, we develop off-line and online power control policies to optimize the transmit power of the two nodes. In the off-line case, we cast the problem as a convex optimization and investigate the structure of the optimal solution. We also develop a generalized waterfilling-based power allocation algorithm to obtain the optimal solution efficiently. For the online case, we quantify the distortion of the system using a cost function and show that the expected cost equals the expected weighted-sum distortion. Based on Banach's fixed point theorem, we further propose a geometrically converging algorithm to find the minimum cost via simple iterations. Simulation results show that our online power control outperforms the greedy power control where each node uses all the available energy in each slot and also performs close to that of the proposed off-line power control. Moreover, the performance of our off-line power control almost coincides with the performance limit of the system.
收起[1]Nanjing Univ Informat Sci & Technol, Sch Elect & Informat Engn, Nanjing 210044, Jiangsu, Peoples R China.
[2]Univ Waterloo, Dept Elect & Comp Engn, Waterloo, ON N2L 3G1, Canada.
[3]Fudan Univ, Sch Data Sci, Shanghai 220433, Peoples R China.
[4]Seoul Natl Univ, Inst New Media & Commun, Seoul 151744, South Korea.
[5]Seoul Natl Univ, Dept Elect & Comp Engn, Seoul 151744, South Korea.
(8.0+极速模式)