移动通信中无线信道特性的研究

从等效低通信道的时变冲激响应的相关函数和功率密度谱函数出发，研究了一些描述广义平稳非相关散射(WSSUS)的无线信道特性的统计参数，并对无线移动衰落信道的特性进行分类。分析了3种常见的小尺度多径衰落信道的统计模型，给出了在平坦衰落信道中系统传输比特误码率的一般分析方法。最后，利用这些模型和方法，给出了一些常见数字调制信号的传输误码率的数值结果。结果表明：衰落对无线移动通信系统传输性能的影响是很大的，在实际中应设法消除它。

Study on the Characteristic of Wireless Channels in Mobile Communications

According to the correlative function and the power density function of time variation pulse response of the equivalent low-pass channel, this paper studies several statistical parameters that describe the wireless channels characteristic of wide sense stationary uncorrelated scatter (WSSUS), and classifies the characteristic of the mobile wireless channels. This paper follows to present three common statistics models of small-scale wireless fading channels, and the general analytical approach of the system transmission bit error rate (BER) in the flat fading channels. Applying the statistics models and the analytical approach, it gives the numerical results of the BER performance of several digital modulation signals. The results show that the fading affects largely the performance of wireless mobile communication system, and we should try to reduce the effect in practice.