Underlay模式下认知无线电OFDM系统多用户资源分配  

Multi-Users Resource Allocation Problem in OFDM Systems Under the Underlay Spectrum Sharing Mode for Cognitive Radio

作　　者：李鑫滨[1] 石爱武[1] 宋兴芳[1] 

机构地区：[1]燕山大学电气工程学院工业计算机控制工程河北省重点实验室,秦皇岛066004

出　　处：《电信科学》2013年第4期83-88,共6页Telecommunications Science

基　　金：国家自然科学基金资助项目(No.61172095);河北省自然科学基金资助项目(No.F2012203138)

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。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.

关 键 词：Underlay频谱共享 OFDM 多用户资源分配 子载波分配 线性封顶注水算法 

分 类 号：TN929.5[电子电信—通信与信息系统]