摘要
本文提出一种适用于下行认知无线电系统的正交频分多址接入资源分配算法,在总发射功率、误比特率和对授权用户干扰受限的条件下最大化系统信息传输速率.本算法分两步实现:首先通过比较各认知用户在各子载波上单位信号发送条件下接收信号的信干噪比实现子载波分配;然后利用凸优化理论求解非负实数域内的比特数和功率值的最优解,并将其调整为符合实际系统需要的比特数和功率值,实现比特和功率分配.仿真结果表明,相比传统的基于频谱空洞的资源分配算法,本算法可以提供显著的系统信息传输速率增益.
This paper proposes an orthogonal frequency division multiple access-based resource allocation algorithm for downlink cognitive radio systems,which targets to maximize the data transmission rate under the constraints of total transmit power,bit error rate and interference to the primary users.It includes two steps：firstly,the subcarriers are allocated according to the signal to interference plus noise ratio of each user over each subcarrier;secondly,the optimal bit and power solution is derived in the non-negative real field and then adjusted into the bit and power allocation results suitable for the practical systems.Simulation results show that the proposed algorithm can provide significant data transmission rate gain comparing with the conventional resource allo-cation algorithms based on spectrum hole.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2010年第3期632-637,共6页
Acta Electronica Sinica
基金
中瑞国际科技合作项目(No.2008DFA11780)
关键词
认知无线电
资源分配
正交频分多址接入
cognitive radio
resource allocation
orthogonal frequency division multiple access
