中文摘要：

为了更有效地求解Underlay频谱共享模式下的OFDM系统多用户资源分配问题,提出了一种公平、复杂度低的资源分配方法,首先利用公平性的子载波分配方法为认知用户分配子载波,然后利用子载波分配结果,将复杂的多用户资源分配问题转化为简单的单用户功率分配问题,并利用一种复杂度较低的线性封顶注水算法对子载波功率的分配进行求解。通过一种TV频段OFDM系统对算法性能进行了仿真对比分析,仿真结果验证了本文所提资源分配方法的有效性和优越性。

英文摘要：

In order to solve the muhi-users＇ resource allocation problem of OFDM systems under the underlay spectrum sharing mode conveniently and efficiently, a fair resource allocation algorithm with low complexity was proposed. The fair subcarrier allocation algorithm was applied to allocate subcarrier for cognitive users to turn the complex problem of resource allocations into a simple problem of a single user power allocation. Also a linear capped water-filling algorithm with low complexity was used to solve the subcarrier power allocation problem. Simulation results show that, compared with other methods, the proposed method has very good effectiveness and suoerioritv in aoDlieation to the TV freauencv＇s OFDM system.