中文摘要：

为了准确和高效地评估在构建下一代广播电视网（NGB）中起重要作用的中国移动多媒体广播（CMMB）系统的链路传输性能，根据CMMB协议标准，利用大量高斯信道下的仿真数据拟合出了接收比特互信息率（RBIR）与误帧率（FER）之间的一一对应关系，然后给出了基于互信息量的CMMB物理层抽象算法——能在解调的输入端计算平均互信息量的RBIR算法，并利用开发的CMMB物理链路仿真平台在巴西信道模型中验证了该抽象算法的准确性：能够精确地预测当前无线信道的质量。

英文摘要：

In order to accurately, efficiently evaluate the link transmission quality of the China Mobile Multimedia Broadcasting （CMMB） system which plays an important role in the construction of the Next Generation Broadcasting （NGB） in China, according to the standard of the CMMB protocol, the one-to-one correspondence between the received bit mutual information rate （RBIR） and the frame error rate （FER） was obtained through the fitting using a mass of Gaussian channel simulation data, and then, the mutual information-based algorithm for physical layer ab- straction in CMMB, called the RBIR algorithm, was put forward. The accuracy of the proposed algorithm was verified by using the CMMB simulation platform under the Brazil channel, i.e. when using the algorithm, the transmission quality of a current wireless channel can be accurately predicted.