一种自适应前向均衡与判决均衡组合结构及变步长改进算法

发布时间：2018-01-25 16:36

本文关键词： 数据传输均衡变步长　出处：《物理学报》2015年23期 　论文类型：期刊论文

【摘要】：信号在超长线缆传输中,线缆的线间串扰及温度梯度变化造成噪声干扰,特别是线缆介电损耗和肌肤效应的影响,导致接收端信号频率色散失真严重,难以恢复原始信号,限制了传输速度.另外,在页岩气、煤层气等资源勘探领域,在用长缆传输数据时,还要求传输高精度同步脉冲信号,用于采集数据相位的标定.线缆的传输效应及噪声干扰严重影响了接收端的信号同步,造成采集数据相位失真.本文针对信号在长缆传输中的非线性失真及衰减问题,提出了一种新型均衡结构,并针对新模型给出了最优系数组合.在此基础上针对改进的结构提出了一种基于反正切函数的变步长算法,该算法配合三误差因子,形成收敛函数,该函数具有收敛速度快,稳态误差小的优点.改进后的自适应组合均衡器计算复杂度低,收敛快,信道跟踪能力强,加快了数据处理速度,同时能较好地应对信道的时变性.仿真结果表明,基于新变步长算法的自适应组合均衡器,性能上提高了50%,并且消除了噪声干扰和码间干扰,测试实验表明,在无中继超长缆(7 km以上)传输中,信号速度提高了一倍.
[Abstract]:In ultra-long cable transmission, the crosstalk between cables and the change of temperature gradient cause noise interference, especially the influence of cable dielectric loss and skin effect, which leads to the serious frequency dispersion distortion of the signal at the receiving end. It is difficult to restore the original signal, which limits the transmission speed. In the field of shale gas, coalbed methane and other resources exploration, the transmission of high precision synchronous pulse signal is required when transmitting data by long cable. It is used to calibrate the phase of data acquisition. The transmission effect of cable and noise interference seriously affect the signal synchronization at the receiving end. This paper presents a novel equalization structure for nonlinear distortion and attenuation of signal in long cable transmission. The optimal combination of coefficients is given for the new model. Based on the improved structure, a variable step size algorithm based on the inverse tangent function is proposed, which combines three error factors to form a convergence function. This function has the advantages of fast convergence and small steady-state error. The improved adaptive combinatorial equalizer has the advantages of low computational complexity, fast convergence, strong channel tracking ability and faster data processing speed. The simulation results show that the performance of the adaptive combined equalizer based on the new variable step size algorithm is improved by 50%, and the noise interference and inter-symbol interference are eliminated. The test results show that the speed of the signal is doubled in the transmission of over 7 km of non-medium and super long cable.
【作者单位】：南京邮电大学电子科学与工程学院;
【基金】：国家科技重大专项(批准号:2011ZX05035-003-003) 江苏省高校研究生科研创新计划项目(批准号:CXZZ13_0472)资助的课题~~
【分类号】：TN911.5
【正文快照】： 1引言无中继超长线缆多用于海洋或测井信号的通信,考虑到高强度的抗拉性和温度适应性,一般选用铠装电缆作为传输介质,而很少使用光纤.但金属介质的介电损耗和肌肤效应会引起严重的码间干扰和信号畸变,从而限制了信号传输速率[1].另外,在超长缆传输中还会受到线间串扰和温度噪

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