Abstract
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.
Original language | English |
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Title of host publication | WCNC 2013 |
Subtitle of host publication | IEEE Wireless Communications and Networking Conference : proceedings |
Place of Publication | Piscataway, NJ |
Publisher | Institute of Electrical and Electronics Engineers (IEEE) |
Pages | 3742-3747 |
Number of pages | 6 |
ISBN (Print) | 9781467359399 |
DOIs | |
Publication status | Published - 2013 |
Externally published | Yes |
Event | 2013 IEEE Wireless Communications and Networking Conference, WCNC 2013 - Shanghai, China Duration: 7 Apr 2013 → 10 Apr 2013 |
Other
Other | 2013 IEEE Wireless Communications and Networking Conference, WCNC 2013 |
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Country | China |
City | Shanghai |
Period | 7/04/13 → 10/04/13 |