城市地区GSM网络规划中的接收质量预测

在数字移动通信网络规划中，希望能对网络服务区内的信号接收质量进行预测，并尽可能减少大量的实测工作．文中以ＧＳＭ网络为背景，首先通过一定的信道模型完成了对不同环境下的多径衰落信道的模拟，然后利用软件模拟接收端对ＧＭＳＫ信号的Ｖｉｔｅｒｂｉ解调，综合考虑了瑞利衰落、阴影衰落、时延扩展、高斯白噪声及同频干扰对误码率的影响．模拟所得的结果是ＧＳＭ系统中典型市区环境下信道解码前对误码率与载干比的关系．最后在考虑了话务量对误码率的影响以后，提出了误码率的预测公式，从而实现了对ＧＳＭ网络接收质量的预测．

Prediction of Received Quality in Urban GSM Network Planning

The multipath fading channel under different environments is simulated by the channel model at first. Sequentially the simulation of the Viterbi equalization demodulation algorithm is carried out by software. The following factors are considered: Rayleigh fading, delay spread, doppler frequency shift, co channel interference, additive white Gaussian noise,etc. The result of the simulation is the relationship between the BER before channel decoding in the GSM network and the C/I under the typical urban environments. At last the formula of the predicted BER is given, and the effect of the traffic is also involved. Both the results and the methods used in this article have positive sense in an integrated scheme of digital mobile communication network planning.