面向OFDM无线中继系统的功率分配算法

doi:10.12305/j.issn.1001-506X.2021.02.28

Abstract

Abstract:

Aiming at the green communication problem of orthogonal frequency division multiplexing (OFDM) wireless relay system, a low complexity power allocation algorithm is proposed. Firstly, the relay strategy of amplify and forward is adopted, in which the source node sends the same information in the two stages of relay transmission. Then, by jointly optimizing the transmission power of the source node and the relay node on each subcarrier, the system can meet the quality of service requirements for the user communication with minimum power consumption. Because the problem is a complex multivariable coupled nonconvex problem, it is difficult to solve it directly. To solve this problem, the Lagrange relaxation method and the block coordinate continuous upper bound minimization method are used to optimize each power variable alternately for obtaining the high-quality suboptimal solution of the original problem. The simulation results show that the algorithm can effectively reduce the overall power consumption of the relay system and provide an effective solution for the green communication of the wireless relay system.

Key words: power allocation, orthogonal frequency division multiplexing (OFDM), relay system, Lagrangian relaxation, block successive upper-bound minimization (BSUM)

CLC Number:

TN911.7

Jingran LIN, Ying CHEN, Jintai YANG, Wei ZHANG, Jian YANG, Zhihao JIANG. Power allocation algorithm for OFDM wireless relay system[J]. Systems Engineering and Electronics, 2021, 43(2): 537-545.

Figures/Tables 5

References 25

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Power allocation algorithm for OFDM wireless relay system

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