多径衰落信号的多重分形谱

Multi-Fractal Spectra of Multipath Fading Signals

利用多重分形模型对多径衰落信号的分形特征进行了分析和讨论 .通过分析 ,指出多径信号的多重分形谱特征是描述移动通信信道的重要参数 ,并引入了一种利用相空间重构的思想来提取信号多重分形特征的算法 .结合分数布朗运动模型 ,对多径信号的重构进行了研究 .对实测数据的分析结果表明 ,分形模型与传统的统计模型相比能更精确地描述多径衰落信号 .

The fractal feature of the multipath fading signals is analyzed and discussed using the multi-fractal model. The multi-fractal spectra of the multipath signals are pointed out to be the important parameters describing the mobile communication channel, and one algorithm is introduced to calculate the multi-fractal spectra using phase space reconstruction thought. Together with fractional Brownian motion (FBM) model, the reconstruction of multipath signals is also studied. Simulation results from practical measured signals demonstrate that the fractal model can describe multipath fading signals more accurately compared to the conventional statistical models.