基于OFDMA系统的改进型功率分配贪婪算法研究

通过考虑功率分配中OFDMA系统的吞吐量与用户间公平性能的平衡问题,在公平约束条件下,提出一种改进型功率分配贪婪算法.该算法根据用户请求进行子载波的预分配,可以有效地实现每个用户具体的比特分配和功率分配.仿真结果表明,该算法的吞吐量逼近于迭代注水功率分配算法,可以在OFDMA系统的吞吐量与用户间的公平性能之间寻求到一个理想的平衡点.

Research on modified power allocation greedy algorithm based on OFDMA system

By considering the equilibrium problem between OFDMA system throughput and the fair performance among users in power allocation, a modified power allocation greedy algorithm is proposed under the fair constraint condition. The proposed algorithm pre-allocates the sub-carrier according to user request and can realize the concrete bit allocation and power allocation of every user effectively. The simulation results show that the throughput of the proposed algorithm is approximate to that of the iterative water-filling power allocation algorithm. And it can seek a ideal equilibrium between OFDMA system throughput and the fair performance among users.