以信道为研究对象,首先分析了加性高斯白噪声信道、瑞利衰落信道和莱斯信道三种信道的数学模型,然后通过仿真比较了三种信道对二进制数字调频系统可靠性的影响。结果表明,加性高斯白噪声信道的性能最好,瑞利衰落信道性能最差,莱斯衰落信道居于两者之间,同时也说明衰落信道对系统可靠性的影响很大,而简单的调频系统不具备抗衰落能力。
This paper analyzes the mathematical models of the additive white Gaussian mfise channel, Rayleigh fading channel and Rieian fading channel, then compares reliability of the three channels in digital FM system. The results show that the performance of the Gaussian channel is the best, and what of Rayleigh fading channel is the worst, also results show that simple FM system does not have ability to resist fading.