一种优化的认知无线电网络资源协同分配算法  

An optimization resource allocation algorithm for cognitive radio network system

作　　者：彭艺[1] 侯永技 龙华[1] 

机构地区：[1]昆明理工大学信息工程与自动化学院,云南昆明650500

出　　处：《云南大学学报（自然科学版）》2015年第2期194-199,共6页Journal of Yunnan University(Natural Sciences Edition)

基　　金：云南省教育厅重点项目(KKJD201303013);云南省科技厅项目(KKSTJ201303008);云南省自然科学基金(KKS0201403016)

摘　　要：在目前的认知无线电研究中,多用户OFDMA系统中如何实现子载波和功率的合理分配是研究的重点之一.针对认知无线电资源分配过程中出现的多认知用户资源分配不公平的问题,研究了认知无线电网络中授权用户占用子载带时,认知用户的吞吐量受限制的问题,提出了一种基于underlay频谱共享模式下的OFDMA认知无线电网络功率与子载带协同分配优化算法.该算法利用干扰门限的设置,使用原始感知信息(RSI)和信道状态信息(CSI)进行功率与子载波分配,然后分别进行功率控制和用户选择的计算,找到最优化传输功率与每个子载带最优使用用户,在保证授权用户免受有害干扰的前提下,使授权用户存在时,也可共享频谱传输,确保了系统的稳定性,提高了网络吞吐量.理论分析与仿真结果表明,相比传统的功率与子载波联合分配算法,该算法可以提高系统的平均加权吞吐量.In most of the existing works on cognitive radio（ CR） systems,the multi-user OFDMA system how to realize the reasonable allocation of sub-carriers and power is one of the key. In this paper,we aim at the process of radio resource allocation in cognitive multi-user resource allocation unfair question,when sub-carrier is occupied by the authorized user,cognitive user throughput will be restricted. We propose an optimization algorithm based on spectrum underlay joint sub-carrier and power allocation in OFDMA system.The algorithm set interference threshold and use the raw sensing information（ RSI） and the channel state information（ CSI） for power and sub-carrier distribution,then calculate the power control and user selection,At last,find the optimal transmission power and optimal user for each sub carrier,which can ensure the authorized users away from harmful interference,so that the presence of an authorized user can also share the spectrum transmission and improve the network throughput.Theoretical analysis and simulation results show that our algorithm enhances average weighted throughput,compared with traditional algorithm of sub-carrier and power allocation.

关 键 词：认知无线电 资源分配 正交频分复用多址接入 

分 类 号：TN911.22[电子电信—通信与信息系统]