摘要
结合认知无线电的特点,将基于频谱感知的功率控制算法应用到OFDMA系统中,建立了PA-OFDMA(Power Adaptation-OFDMA)仿真模型,实现了认知环境下的多址接入技术。该模型基于频谱感知信息,通过一种功率阈值分配算法自适应地为每个子信道分配一个独立的功率阈值,限定使用该信道认知用户的最大发射功率,实现非授权用户与授权用户的频谱共享。与干扰温度模型进行了比较,仿真结果表明,该模型解决了干扰温度模型中的局部干扰问题,提高了系统容量,具有较高的频谱利用率和较低的误比特率。
The advantage of OFDMA system is introduced and a proposed power control algorithm is used for constructing a PAOFDMA(Power Adaptation-OFDMA)model for multiple access in cognitive radio networks.A power threshold allocation algorithm based on spectrum sensing information is proposed to allocate distinct power thresholds for each sub-channel adaptively for restricting the maximum transmitting power of unauthorized user.Comparing with the Interference Temperature Model,simulation results indicate the proposed power threshold allocation algorithm can solve the partial interference problem in Interference Temperature Model,improve the spectrum utilization efficiency and reduce the bit error rates.
作者
李永芳
庄文学
张一晋
LI Yongfang;ZHUANG Wenxue;ZHANG Yijin(School of communication signals,Nanjing Institute of Railway Technology,Nanjing 210031,China;School of Electronic Engineering and Optoelectronic Technology,the Ministerial Key Laboratory of JGMT,Nanjing University of Science and Technology,Nanjing 210031,China)
出处
《无线电通信技术》
2018年第3期242-246,共5页
Radio Communications Technology
基金
中央高校基本科研业务费专项资金资助项目(30920140122005)
