本文選題：電力線通信 + 脈沖噪聲　； 參考：《南京理工大學》2016年碩士論文

【摘要】：電力線通信系統(tǒng)(Power Line Communication,簡稱PLC)是利用廣泛分布的電力線進行數(shù)據(jù)傳輸與信息交換的一種通信方式。電力線通信具有組網(wǎng)方便,分布區(qū)域廣等特點,因此利用電力線進行通信可以節(jié)約大量成本。近年來,電力線通信已逐步成為通信領域研究的熱點。然而,電力線最初并不是為傳輸信號所設計,電力線通信系統(tǒng)中存在多徑效應、信號衰減和脈沖噪聲等現(xiàn)象。這導致了電力線通信系統(tǒng)容量較低,可靠性差等問題。為解決這些問題,本文圍繞提高PLC信道容量,減少脈沖噪聲開展研究工作,并取得如下成果：(1)為了研究脈沖噪聲對PLC信道容量的影響,建立了電力線信道模型。通過引入米德爾頓A類噪聲模型,分析了信道噪聲的分布,并對PLC信道容量進行了分析。仿真結果表明,電力線信道容量與噪聲分布具有相關性。(2)針對電力線通信系統(tǒng)容量低問題,提出三相電力線協(xié)作構建多輸入多輸出(Multiple-Input Multiple-Output,簡稱MIMO)電力線信道模型。在脈沖噪聲影響下利用奇異值分解的方法分析了MIMO信道容量。為了進一步提高信息傳輸速率,引入一種準最大和速率預編碼算法來提高系統(tǒng)的和速率。仿真表明基于MIMO的電力線信道在容量上有較大提高。噪聲脈沖性高時,準最大和速率預編碼算法性能優(yōu)于塊對角化預編碼算法,在低信噪比時性能與奇異值分解預編碼算法接近。(3)針對脈沖噪聲造成電力線通信誤碼率高的問題,提出部分傳輸序列的改進型脈沖噪聲削減方法,即通過部分傳輸序列方法對發(fā)送信號進行預處理,設置門限削減脈沖噪聲。仿真表明改進型脈沖噪聲削減方法可以提高系統(tǒng)的輸出端信噪比性能與誤碼率性能。因此,改進型脈沖噪聲削減方法對脈沖噪聲的削減性能優(yōu)于脈沖噪聲削減方法。因此通過引入MIMO技術、預編碼技術以及脈沖噪聲削減方法可以使電力線通信獲得更高的容量與更好的誤碼率性能,達到預期效果。
[Abstract]:Power Line Communication system (PLC) is a kind of communication mode which uses widely distributed power line to transmit data and exchange information. Power line communication has the characteristics of convenient networking and wide distribution, so the power line communication can save a lot of cost. In recent years, power line communication has gradually become a hot topic in the field of communication. However, the power line is not designed for transmission signal at first. There are multipath effect, signal attenuation and pulse noise in power line communication system. This leads to low capacity and poor reliability of power line communication system. In order to solve these problems, this paper focuses on improving the capacity of PLC channel and reducing the impulse noise. The results are as follows: (1) in order to study the influence of impulse noise on the capacity of PLC channel, a power line channel model is established. By introducing Middleton Class A noise model, the distribution of channel noise is analyzed, and the capacity of PLC channel is analyzed. The simulation results show that the power line channel capacity is correlated with the noise distribution. (2) aiming at the low capacity of the power line communication system, a three-phase power line cooperative power line model is proposed to construct the multiple-input multiple-output (MIMO) power line channel model. The MIMO channel capacity is analyzed by singular value decomposition (SVD) under the influence of impulse noise. In order to further improve the rate of information transmission, a quasi-maximum and rate precoding algorithm is introduced to improve the sum rate of the system. Simulation results show that the capacity of power line channel based on MIMO is greatly improved. When the noise pulse is high, the performance of quasi-maximum and rate precoding algorithm is better than block diagonal precoding algorithm, and the performance is close to that of singular value decomposition precoding algorithm at low SNR. (3) aiming at the problem of high bit error rate in power line communication caused by impulse noise, An improved pulse noise reduction method for partial transmission sequences is proposed, which means preprocessing the transmitted signals by partial transmission sequences and setting the threshold to reduce the impulse noise. The simulation results show that the improved impulse noise reduction method can improve the output SNR performance and bit error rate (BER) performance of the system. Therefore, the improved impulse noise reduction method is superior to the pulse noise reduction method. Therefore, by introducing MIMO technology, precoding technology and impulse noise reduction method, power line communication can achieve higher capacity and better BER performance, and achieve the desired results.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TN913.6
，

本文編號：2103859