一种时域—码域联合的认知无线电频谱感知算法

为了提高认知无线电系统中频谱感知的性能,对多维联合的频谱感知进行了研究,提出一种时域—码域联合的频谱感知算法。该算法主要利用了直接序列扩频主用户信号频谱空间中时域与码域的特性,分别从时域与码域的角度对信道的状态进行检测,其中时域采用能量感知,码域分析扩频主用户信号的二次功率谱,最终共同确认信道状态。仿真结果表明,联合感知算法对应的检测性能优于单纯时域或码域感知,能够直接应用于直接序列扩频主用户的频谱感知。

Joint time-code spectrum sensing algorithm for cognitive radio

In order to improve the performance of spectrum sensing in cognitive radio systems, this paper studied the multi-dimensional spectrum sensing, and proposed a joint time-code spectrum sensing algorithm. The proposed algorithm utilized the characteristics of primary signals with direct-sequence spread spectrum in both the time domain and the code domain, and detected the state of the channel from both time domain and code domain perspectives using energy detection in the time domain and analyzing power spectrum of primary users in the code domain. Finally it confirmed the state of the channel together. Simulation results show that the performance of the joint algorithm outperforms the single time-domain or code-domain spectrum sensing algorithm. The proposed algorithm is applicable in spectrum sensing of primary users with direct-sequence spread spectrum.