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移动信道是一典型的长突发信道,有其特殊的性质,所以将移动信道表示成一个Gilbert模型在工程上具有一定的实用价值。本文从一移动信道实测曲线R出发,利用非线性最小二乘拟合算法,得出二状态Markov模型各参数,推导出信道无误串分布G(m)的解析表达式,进而得到信道概率转移矩阵P;在此基础上将P代入Gilbert模型中求出模型的三个主要参数P、p、h,并由此推导出其差错统计指标:G(k)、Pe、p(n,m);最后讨论了h取不同值时对模型精度的影响,及h参数的优化设计问题。
Mobile channel is a typical long burst channel, which has its own special properties. Therefore, it is of practical value to represent the mobile channel as a Gilbert model. In this paper, starting from a measured curve R of a mobile channel, a non-linear least-squares fitting algorithm is used to obtain the parameters of the two-state Markov model, and an analytical expression of the channel without error string distribution G (m) is deduced to obtain the channel probability transfer matrix On the basis of this, P is substituted into the Gilbert model to get the three main parameters P, p, h of the model, and the statistical indexes of the errors are derived: G (k), Pe, p (n, m); Finally, the effect of different values of h on model accuracy and the optimization design of h parameters are discussed.