1000 BASE-T衰减信道模型设计和实现

Design and implementation of 1000 BASE-T attenuation channel mode

文中采用Wideband模型对1000 BASE-T的非屏蔽五类双绞线信道建模。与传统通过RLCG建模相比,得到与双绞线更加匹配的信道衰减传输函数。经过频域采样、傅里叶逆变换和窗函数截取后,获得时域信道FIR滤波器系数,最终将双绞线信道等效为23阶FIR滤波器。将模型仿真曲线与实测曲线对比后得知,信道模型冲激响应与实际信道的单脉冲响应曲线能较好地重合,验证了该信道模型的正确性。实验结果表明,该信道模型能较为真实地反映1000 BASE-T信道的衰减和时延所导致的码间干扰。

In this paper the Wideband model is used to model the unshielded Category 5 twisted pair channel of 1000 BASE-T.Compared with traditional RLCG modeling,it obtains a channel attenuation transfer function that more matched with the twistedpair.After frequency domain sampling,inverse Fourier transform and window function interception,the domain channel FIR filter coefficients are obtained,and finally the twisted pair chamnel is equivalent to a 23 order FIR filter.Comparing the model simulation curve with the measured curve,it is known that the impulse response of the channel model coincides well with the monopulse response curve of the actual channel,which verifies the correctness of the channel model.Experimental results show that the channel model can truly reflect the inter-symbol interference caused by the attenuation and time delay of 1000 BASE-T channel.