目的：介绍一种基于低压电力线通信的病房呼叫系统。
Objective To introduce ward calling system based on power line communication.
本文主要研究基于OFDM的低压电力线通信信道估计算法。
Channel estimation is researched for OFDM system in low-voltage power line communication in this paper.
文中分析了电力线信道的阻抗、噪声、衰减特性，据此给出了电力线信道模型，有助于深入理解低压电力线通信的特点。
This paper analyzes the impedance, noise and attenuation characteristics of PLC channel and introduces the PLC channel model which will help us understand PLC further.
分析了低压电力线信道特性，针对信道慢时变特性及噪声复杂的特点，提出一种适用于低压电力线通信信道的直接决策估计算法。
This paper analyses channel properties of low-voltage power line channels. Aiming at the slow-variant and complex noise of channel, an estimation algorithm is put forward.
因此，该低压电力线扩谱通信系统能较好地抑制低压电力线通信信道的干扰，提高了通信的可靠性，可广泛应用于低压电力线通信领域。
Thus, the system can restrain the noise from low voltage power line and improve communication reliability. It may be widely applied to the communication field using low voltage power line.
课题重点研究了计费终端、低压电力线载波模块和数据管理中心的设计，并制定了相关的通信协议。
The thesis investigates the design of the data center, the module of low power line carrier and the data administration center, the thesis also constitutes the correlative communication protocols.
系统还需要在两个方面进行改进：(1)抵抗低压电力线恶劣通信状况的能力；(2)适合于音乐信号的传送。
The system requires two improvements: (1) the ability to counter the severe communication condition of low-voltage power line and (2) the ability to transmit music signal.
因此，研究、开发和应用低压电力线载波通信技术具有非常重大的意义和十分广阔的前景。
Therefore, there is a wide foreground for the study and application of low-voltage power line communication technology.
文中分析比较了OFDM系统信道估计算法，并根据低压电力线信道的特点，选择了适合于电力线通信的信道估计方法。
In this paper, some algorithms for estimating channel in OFDM system are analyzed and compared, and the most appropriate one is selected according to power line channel's characteristics.
OFDM技术以其抗干扰性强，传输速率高成为低压电力线高速通信的主流技术。 信道估计算法是OFDM系统接收端的关键技术之一。
OFDM technique has been the mainstream in low-voltage power line communication because of its good capability against interference and high transmission rate.
对低压电力线载波通信技术方案的决策，要依据有可比性的测试数据。
The decision on technical scheme of the low-voltage power-line carrier communication should be based on the testing data with comparability.
文章提出了一种基于“逻辑拓扑结构”组网的低压电力线载波通信组网方法，描述了建立该结构的算法，并进行了实验室仿真。
This paper introduces a method of constructing a low-voltage PLC network based on logical topological structure, amd discusses its algorithm and simulation.
低压电力线信道特性是设计低压电力线载波通信系统的基础。
The characteristics of power line channel are the foundation of designing the low voltage power line carrier communication system.
低压电力线作为通信媒介实现数据通信具有很大的应用潜力。
As communication medium, the low voltage powerline has great potential in application.
测试结果的分析可供低压电力线载波通信方案选择时参考。
The analysis of testing result provides the reference to the scheme selection of the LV power-line carrier communication.
在编码方法的基础上搭建基于RISE3201低压电力线数据通信硬件和软件部分。
The data communication hardware and software of low-voltage power line based on coding method are built on RISE3201.
结果表明，该低压电力线扩谱通信系统具有较强的抗干扰能力。
The experiment results indicate that the system has rather strong anti-jamming ability.
此外，在低压电力线载波通信中，存在着通信传输距离有限的问题。
In addition, in the communication of low power line carrier exists the problem of the transmitted distance of communication.
在参考osi网络通信协议模型与多种国外家庭自动化总线的基础上，构建一个完整的分层的基于低压电力线的通信协议模型。
Constructing a full layered communication protocol module, with reference to the network communication protocol model of OSI and overseas home automation bus.
该系统具有成本低、易实现等特点，是一种可以用于实现自动抄表的经济可靠的低压电力线载波通信系统。
This system is easily to achieve by using low cost hardware and an economical communication scheme to realize AMR on low-voltage power line.
针对目前基于低压电力线网络通信信道编码技术进行了探讨与研究，并在此基础上实现了电力线通信。
The paper explores and makes research on low-voltage power line network communication and channel coding techniques to achieve power line communication.
基于该模型，研制了低压电力线的MSK双路扩谱通信电路系统。
The communication system model is set up with MSK and double-pathway spread spectrum for low voltage power line.
为了提高低压电力线载波通信的实用性，需要配合使用合适的高层通信协议。
In order to improve the practicability of the low voltage power line carrier communication (PLCC) some high level communication protocols should be applied.
这篇文章介绍了一种基于OFDM的低压电力线载波通信系统。
低压电力线载波通信技术由于涉及到家庭自动化和家庭上网的良好前景而备受瞩目。
Powerline Communication(PLC) as a new connection measure for family wide-band network is becoming more attractive in the recent years.
低压电力线载波通信技术由于涉及到家庭自动化和家庭上网的良好前景而备受瞩目。
Powerline Communication(PLC) as a new connection measure for family wide-band network is becoming more attractive in the recent years.
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