PLC系统中容量分析与噪声削减技术研究

发布时间：2018-07-06 19:28

  本文选题：电力线通信 + 脉冲噪声　； 参考：《南京理工大学》2016年硕士论文

【摘要】：电力线通信系统(Power Line Communication,简称PLC)是利用广泛分布的电力线进行数据传输与信息交换的一种通信方式。电力线通信具有组网方便,分布区域广等特点,因此利用电力线进行通信可以节约大量成本。近年来,电力线通信已逐步成为通信领域研究的热点。然而,电力线最初并不是为传输信号所设计,电力线通信系统中存在多径效应、信号衰减和脉冲噪声等现象。这导致了电力线通信系统容量较低,可靠性差等问题。为解决这些问题,本文围绕提高PLC信道容量,减少脉冲噪声开展研究工作,并取得如下成果：(1)为了研究脉冲噪声对PLC信道容量的影响,建立了电力线信道模型。通过引入米德尔顿A类噪声模型,分析了信道噪声的分布,并对PLC信道容量进行了分析。仿真结果表明,电力线信道容量与噪声分布具有相关性。(2)针对电力线通信系统容量低问题,提出三相电力线协作构建多输入多输出(Multiple-Input Multiple-Output,简称MIMO)电力线信道模型。在脉冲噪声影响下利用奇异值分解的方法分析了MIMO信道容量。为了进一步提高信息传输速率,引入一种准最大和速率预编码算法来提高系统的和速率。仿真表明基于MIMO的电力线信道在容量上有较大提高。噪声脉冲性高时,准最大和速率预编码算法性能优于块对角化预编码算法,在低信噪比时性能与奇异值分解预编码算法接近。(3)针对脉冲噪声造成电力线通信误码率高的问题,提出部分传输序列的改进型脉冲噪声削减方法,即通过部分传输序列方法对发送信号进行预处理,设置门限削减脉冲噪声。仿真表明改进型脉冲噪声削减方法可以提高系统的输出端信噪比性能与误码率性能。因此,改进型脉冲噪声削减方法对脉冲噪声的削减性能优于脉冲噪声削减方法。因此通过引入MIMO技术、预编码技术以及脉冲噪声削减方法可以使电力线通信获得更高的容量与更好的误码率性能,达到预期效果。
[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.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN913.6
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本文编号：2103859