【摘要】 为了解决认知无线电中多个用户充分利用空闲频谱的问题,设计带有频谱感知和动态资源分配功能的多用户NC-OFDM系统。该系统首先根据频谱感知的资源状况,结合认知用户信道估计获得的信道衰落情况,对系统的子载波、比特和功率进行分配,然后以NC-OFDM为调制技术传送数据。仿真结果表明,该系统比静态资源分配系统具有更好的误码性能和归一化信道容量。更多还原

【Abstract】 In order to resolve the problem of utilizing the spectrum hole sufficiently,design the NC-OFDM system which has the function of spectrum sensing and dynamic resource allocation.First,it allocates the sub carrier,bit and power based on the knowledge of the spectrum sense and the channel gains acquired by channel estimate of cognitive radio users,and then transmits data by NC-OFDM.The simulation results indicate that,the system represents a better BER performance and channel capability.更多还原