无线移动信道在FSK系统中的建模与仿真

Modeling and simulation of wireless mobile channel in FSK system

为在功率、带宽、复杂度和成本受约束的前提下能提供满足吞吐量和服务质量目标的通信系统,对信道模型的仿真研究非常重要。文章对包括瑞利、莱斯、多普勒和多径在内的信道模型进行了性能分析与比较,运用数字信号处理的方法,将不同信道模型分别加载于2FSK调制系统中,分别比较了在输入信噪比相同条件下不同模型对系统性能的影响。结果表明,多径信道对传输信号的影响最大,其它信道模型影响下的系统误比特率随着信噪比的增大而降低。该方法较好地描述了不同信道模型对移动信号性能影响。

In order to provide the throughput and quality of services to meet the goals of communication systems in the premise of power, bandwidth, complexity and cost repressed, the simulation study of channel model is important. Channel Model,including which are Rayleigh, Rice, Doppler and muhipath,is analyzeded and compared.By the method of digital signal processing,different channel models are added to 2FSK system and the influence of the system performance.The result shows that multipath channel is the most serious one of four channels,and the other three is lower with the increased SNR.The method described the influence of difference channel model preferably.