摘要
认知无线电(CR)可用于提高无线频谱资源利用率,正交频分复用(OFDM)则是一种理想的CR系统调制技术。针对基于OFDM的认知无线电系统特性,提出一种多用户认知OFDM系统的资源分配算法。根据比例公平原则分配子载波,通过注水法分配功率,使认知用户不干扰授权用户正常通信,同时兼顾公平比例原则,实现认知用户系统总容量最大化。仿真结果表明,该算法能在保证用户公平性的前提下,有效提高频谱利用率,并且算法复杂度较低。
Cognitive Radio（CR） is a concept to improve the utilization of scarce wireless spectrum resources, and Orthogonal Frequency Division Multiplexing （OFDM） is regarded as the best technology to match with the CR system. In this paper, a new resource allocation algorithm for OFDM CR system is presented,based on the characteristics of OFDM- based CR system. This algorithm allocates the subcarriers according to the proportion fairness principle and allocates power by water filling, solving the optimization problem：maximize the system capacity of secondary users, on the one hand,the total transmit power of secondary users should below the transmit power constraint, on the other hand, the interference to primary users should under the maximum interference level. Simulation results show that the proposed algorithm can not only satisfy the fairness ,but also improve system capacity with low complexity.
出处
《计算机工程》
CAS
CSCD
北大核心
2015年第7期111-114,119,共5页
Computer Engineering
基金
中国科学院战略性先导科技专项基金资助项目(XDA06011100)
关键词
认知无线电
正交频分复用
资源分配
功率约束
干扰约束
比例公平
Cognitive Radio （CR）
Orthogonal Frequency Division Multiplexing （ OFDM ）
resource allocation
power constraint
interference constraint
proportion fairness
