摘要
针对频谱感知中单门限能量检测的不足,研究了双门限能量检测,结合OFDM频谱利用率较高的特点,提出了将双门限能量检测与OFDM系统相结合的方法。以OFDM系统为基础,将系统中的子信道作为待感知用户,根据可用子载波数量确定实际感知用户,在子信道中进行双门限能量检测,数据融合中心采用"or"准则进行判决。仿真结果表明,该方法能够较好地识别出主用户,从而控制OFDM系统的数据传输,随着可用子载波个数的增加,可以得到更好的识别性能。
Concerning the shortcoming of single-threshold energy detection,this paper focused on the dualthreshold energy detection.Combining the efficiency in spectrum sensing of OFDM,this paper proposed a method of combining the dual-threshold energy detection and the OFDM system.This method was based on the OFDM system.Sub-channel was used as a planning perceptual user.Actual second user was based on the number of subcarriers in used.Dual-threshold energy detection was used in sub-channel.Judgment of Data fusion center used ＂or＂ standard.The simulation results indicate that the method can better identify the primary users and control the OFDM system in data transmission.With increasing in the number of available sub-carriers,the recognition performed better.
出处
《计算机仿真》
CSCD
北大核心
2013年第9期165-168,212,共5页
Computer Simulation
基金
国家自然科学基金资助项目(61174194)
