计算机应用 ›› 2012, Vol. 32 ›› Issue (05): 1221-1223.

• 网络与通信 • 上一篇    下一篇

认知OFDM系统中基于能耗受限的频谱感知方法

陈国忠1,唐加山2   

  1. 1. .南京邮电大学 通信与信息工程学院, 南京 210003
    2. 南京邮电大学 理学院, 南京 210003
  • 收稿日期:2011-11-07 修回日期:2011-12-23 发布日期:2012-05-01 出版日期:2012-05-01
  • 通讯作者: 陈国忠
  • 作者简介:陈国忠(1987-),男,福建泉州人,硕士研究生,主要研究方向:现代通信中的智能信号处理技术;唐加山(1968-),男,安徽天长人,教授,博士,主要研究方向:概率论、随机过程、随机服务系统、现代通信中的智能信号处理技术、信道辨识与均衡。

Energy-constrained spectrum sensing method for OFDM cognitive radio system

CHEN Guo-zhong1,TANG Jia-shan2   

  1. 1. College of Telecommunications and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing Jiangsu 210003, China
    2. College of Science, Nanjing University of Posts and Telecommunications, Nanjing Jiangsu 210003, China
  • Received:2011-11-07 Revised:2011-12-23 Online:2012-05-01 Published:2012-05-01
  • Contact: CHEN Guo-zhong

摘要: 针对传统频谱感知方法没有考虑能耗受限对认知系统的影响,以认知正交频分复用(OFDM)系统为背景,提出一种基于能耗受限的联合优化频谱感知方法。该方法基于传统能量检测方法,以最大化吞吐量性能为目标,将频谱感知问题建模为一个优化问题,联合多个频带选取最优感知时间和判决门限参数,使其在能耗受限的情况下,总吞吐量达到最大。仿真结果表明,与传统使用能耗均分的检测方法相比,该方法具有更大的吞吐量,能够更好地节约能耗。

关键词: 认知无线电, 正交频分复用, 频谱感知, 能耗受限

Abstract: Considering that the traditional spectrum sensing method does not take into account the impact of the energy consumption, a joint optimization of spectrum sensing method under the energy constraints for OFDM system was proposed. Based on the traditional energy detection, the spectrum sensing problem was modeled into an optimization problem. Both the sensing time and the decision threshold parameters of each band were optimized, under the energy-constrained case, to maximize the total throughput of the system. The simulation results show that, compared with the traditional detection method, the system using the proposed method not only has higher throughput, but also saves more energy.

Key words: Cognitive radio, OFDM, Spectrum sensing, Energy-constrained

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