基于信道统计相关性OFDM系统资源分配算法

A novel wireless resources allocation algorithm for multiuser OFDM system based on tap correlation information

在正交频分复用(OFDM)系统中,对信道相关及信道独立的子载波和功率分配调度算法进行了研究,提出了一种新的基于信道参数统计相关性的子载波和功率分配算法.这种算法利用信道统计信息来减少信道反馈,由于最优解的高度非线性,转化成离散模型的求解可以降低算法的复杂度.仿真结果显示:相对于传统的信道相关调度算法,基于信道统计相关性的调度算法在系统总容量上有微小降低,但算法复杂度大大降低,信道反馈信息的减少节省了控制信令带宽;同时在性能上优于基于路径损耗等信道独立的调度算法.

Subcarrier and power allocation algorithms in OFDM system were researched based on the channel status information feedback and the channel independent scheduling algorithm based on pathloss. A novel wireless resources allocation algorithm is proposed based on statistical tap correlation information, in which the channel status statistical information was utilized so as to reduce the channel feedback. Because the optimal solution based on multiuser water filling theory is highly nonlinear, the proposed algorithm was converted into discrete method to achieve a lower algorithm complexity. Proposed algorithm has very little reduction in overall system capacity, but much lower complexity and small channel feedback comparing to the traditional scheduling algorithm based on CSI, and it outperforms greatly channel independent scheduling algorithm based on path-loss.