Optimal cooperative water-filling power allocation for OFDM system

Publisher:
IEEE
Publication Type:
Conference Proceeding
Citation:
IEEE Wireless Communications and Networking Conference, WCNC, 2013, pp. 3742 - 3747
Issue Date:
2013-08-21
Full metadata record
Files in This Item:
Filename Description Size
06555170.pdfPublished version377.67 kB
Adobe PDF
It is well known that traditional water-filling provides a closed form solution for capacity maximization in orthogonal frequency division multiplex (OFDM) system. In this paper, cooperative power allocation is investigated in a two-transmitter multi-receiver model for OFDM systems. The local full channel state information (CSI) is available at the two transmitters respectively, where each transmitter has an individual power constrain. The transmitters first cooperate by sharing CSI, and then jointly optimize power allocation in the metric of sum throughput, which can be modeled as a convex optimization problem. Through an application of Karush-Kuhn-Tucker (KKT) conditions, the convex optimization problem is reformulated as a simplified convex one. Then the closed form solution is derived, which takes a form similar to classic water-filling principle. Based on the solution, the optimal cooperative power allocation algorithm is constructed, the structure of which can be explained as a cooperative water-filling relative to the traditional water-filling. Finally, numerical simulation is given to evaluate and demonstrate the performance of the optimal cooperative water-filling scheme. © 2013 IEEE.
Please use this identifier to cite or link to this item: