【作者】 高茂宏；

【导师】 刘杰；

【作者基本信息】 北京交通大学 ， 模式识别与智能系统， 2007， 硕士

【摘要】 本论文研究油田注水井水声信道特性，并对其仿真；然后研究信道自适应均衡算法，并对水声信道的均衡进行仿真。本文将本征路径水声信道模型(EUACC)引入到油田注水井水声信道中。结合实际情况，对注水井水声信道进行理论分析，计算出EUACC模型仿真参数。并结合带通通信方式仿真注水井水声信道，得出仿真结果。为降低码间干扰产生的误码率，本文提出自适应均衡技术，主要包括线性均衡和判决反馈的非线性均衡。在分析中，结合最小均方误差算法和递归最小二乘算法的原理和特点，设计出线性、非线性共四种算法的计算流程。结合多径信道模型，对这四种算法在基带通信条件下仿真得出对应的误码率。根据均衡效果，给出了每种算法的适用信道条件。本文结合改进的EUACC水声信道模型、带通通信方式和自适应均衡算法，设计了注水井水声通信系统的信道均衡模型并用此模型进行仿真。分析系统中接收滤波器带宽以及噪声对均衡器处理效果的影响，提出利用接收滤波器与均衡器对信噪比较小的接收信号联合处理的方法。更多还原

【Abstract】 Our emphasizes in these paper are the simulation of the underwater acoustic channel of water inject well based on the characteristices of the real ones, which are obtained by analyzing the real ones in the oil field, as well as the application to the channel equalization algorithm in the equalization for the underwater acoustic channel of the water inject well mentioned above.First of all, we introduce the model of EUACC (Engipath Underwater Acoustic Communication Channel) ,as well as its application to the underwater acoustic channel of water inject well. In terms of the model of EUACC,we use the simulated parameters,which are obtained through analyzing the model of the acoustic channel of water inject well in theory,to simulate the underwater acoustic channel of the water inject well by the approach of passband communication.Then,the final result of the simulation,as well as the corresponding analysis of the results,are showed finally.In addition,we propose the approach of the adaptive equalization algorithm to reduce rate of error code ,which is caused by ISI (intersymbol inference).According to the structure of adaptive equalization,we demonstrate the analysis of liner equalization and decision feedback equalization,in which the principles and the characteristices of the Least Mean Square algorithm and Recursive Least Square algorithm are adopted.Moreover,four approaches of four algorithm,which are proposed by ourselves, are demonstrated,as well as the simulation of performance of each approach under the condition of baseband communication based on the simple multipath model.In terms of the result of the simulation,the adapted channel conditions for each algorithm are demonstrated.At last, with the equalization algorithm,the improved model of EUACC,as well as the approach of passband communication mentioned above, we demonstrate the model of the the underwater acoustic equalization channel of the water inject well,as well as the simulation based on these model.The bandwidth of the filter and the effect of noise to the performance of equalizer are analyzed too.Additionally,a new approach based on both the filter and the equalizer are proposed.更多还原