认知无线电中频谱资源分配方法研究

摘要

Based on the characteristics of cognitive radio and the orthogonal frequency division multiplexing ( OFDM) technique, the spectrum resources allocation method in cognitive radio is studied. Based on the result of spectrum detection and channel estima-tion, the paper discusses the method of using discontinuous spectrum as an integrated part to transmit data. The cognitive user can obtain the maximum communication throughput by using the algorithm of power allocation. By improving the algorithm, the system performance is enhanced. The simulation results show that the method can improve the spectrum efficiency,and the improved algorithm can enhance the system performance.%基于认知无线电技术特点和OFDM通信技术的传输特性，针对认知无线电中频谱资源分配方法进行研究。结合频谱检测和信道估计的结果，探讨了一种将不连续频谱作为一个整体进行数据传输的方法，通过功率分配算法，使得认知用户获得的通信吞吐量达到最大，并在此基础上进一步改进算法，完善了系统性能。仿真结果表明，该算法可以有效提高频谱利用效率，改进后的算法进一步提高了系统通信性能。