NC-OFDM系统中加窗技术研究

The Research on Windowing in Non-continuous OFDM Systems

在非连续OFDM(NC-OFDM)系统中,授权用户会受到感知用户带外泄漏功率的干扰.为了在保护授权用户通信性能的前提下高效利用机会频谱,采用时域加窗的方法,研究了不同窗函数下感知用户对授权用户的干扰问题,分析了窗函数参数、授权用户频谱位置和频谱占用率等系统参数对加窗技术抑制带外干扰性能的影响,并给出了NC-OFDM系统中最优窗的类型.仿真结果表明:针对不同的授权用户频谱位置和频谱占用率参数,时域加窗的方法均可有效降低感知用户对授权用户的干扰.

In non-continuous orthogonal frequency division multiplexing（NC-OFDM） system,the licensed users suffer out-of-band（OOB） interference from the rental users.In order to protect the licensed users＇ performance while efficiently exploiting the spectrum resources,a time-domain windowing techniques is suggested in studying the out-band interference of rental users under different windows,and the corresponding interference suppression performance is analyzed under the parameters of window functions,location and band occupancy of the licensed users.Moreover,the optimized window type is presented.The simulation results show that the time-domain windowing techniques can effectively reduce rental users＇ interference to the licensed users for different location and band occupancy of licensed users.