关键词: 干扰信道, 迭代注水, 分布式功率分配, 博弈论

Abstract:

This paper considers an optimization problem of sum-rate in the Gaussian frequency-selective channel. This problem can be modeled as a competitive game model with a compensation function. We find that the compensation function can also be modeled as a game among sub-channels (called sub-channel game in this paper). In an iterative fashion, the Nash equilibrium of the sub-channel game can be reached, which is the asymptotically optimal compensation term. Stackelberg equilibrium with multiple leaders is introduced to represent the equilibrium point of the competitive game model with a compensation function. At the equilibrium point, all users operate on the optimal rate region frontier. Then, an iterative multiple water-levels water filling algorithm is proposed to efficiently reach the Stackelberg equilibrium. Simulation results show that our proposed algorithm has a significant improvement on the sum-rate compared with IWFA and exhibits the quasi-to-optimal performance.

Key words: interference channel, iterative water filling, distributed power allocation, game theory