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Power Line Communications and Its Applications, 2005 International Symposium on

Date 6-8 April 2005

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  • 2005 International Symposium on Power Line Communications and Its Applications (IEEE Cat. No.05EX981)

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  • 2005 International Symposium on Power Line Communications and its Applications

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  • Copyright page

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  • Message from the ISPLC 2005 general chair

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  • General chair

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  • Table of contents

    Page(s): v - xi
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  • Medium voltage overhead power-line broadband communications; transmission capacity and electromagnetic interference

    Page(s): 2 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1838 KB) |  | HTML iconHTML  

    A channel model suitable for multi-wire overhead medium-voltage lines is proposed. This model is then employed in order to evaluate the multipath channel impulse response and the associated transmission capacity limit in actual overhead medium-voltage power distribution networks for broadband power-line communications applications. Electromagnetic interference limitations of such systems are discussed. View full abstract»

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  • Broadband powerline channel and capacity analysis

    Page(s): 7 - 11
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    Powerline channel has been considered as a medium not only for low-rate, control communications, but also for high-speed data communications, such as home networking and Internet access. In order to implement advanced communication technologies, the complete knowledge of the broadband powerline channel, including the analysis of the channel capacity, are required. This paper strives to widen the understanding of broadband indoor powerline channel by focusing on the properties of indoor powerline channels and its noise behavior. We use water-poring algorithm to optimize the channel capacity. View full abstract»

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  • Potential performance of PLC systems composed of several communication links

    Page(s): 12 - 16
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1678 KB) |  | HTML iconHTML  

    We consider data transmission over a bus system composed of several communication links. All users of the system simultaneously receive transmitted signals with different reliabilities depending on their distance from the sender. Two possible ways of organizing communication are analyzed. The first algorithm includes transmission in a few steps, where each step is devoted to a reliable delivery of the message from one intermediate user to another one. All other users exclude themselves from the system for this step. The second algorithm assumes that all users of the system are active all the time, and they receive side information from communication of intermediate users, which allows them to reduce uncertainty about the original message. Lower bounds on the time needed to deliver a message over the system that follow from the capacity arguments for both methods are given. These bounds are illustrated by numerical examples. View full abstract»

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  • In-home AV PLC MAC with neighboring networks support

    Page(s): 17 - 21
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    Audio/video (AV) devices are becoming more and more common in homes today. The immediate consequence is the need for interconnection of all these devices. Power line communications (PLC) may be an excellent candidate to become the networking solution only if several drawbacks are overcome. Power line technologies allow reaching aggregated throughputs of up to 200 Mbps. However, channels are noisy, and overall capacity must be shared among several nodes and different vendors that coexist in the same medium. Besides, FCC regulations impose low power transmission and notching. It is therefore essential to maximize the efficiency of the technology to reach performance levels competitive for audio/video technologies. View full abstract»

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  • Investigation of MAC protocols for single frequency network technique applied in powerline communications

    Page(s): 22 - 26
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    We investigate MAC protocols for large powerline communications (PLC) networks using single frequency network (SFN) technique. The performances of the MAC protocols are evaluated by both analytical and simulation modeling. The analytical and simulation results are similar, and in some cases are almost the same. We also see the difference performance behavior of slotted ALOHA in the PLC-SFN networks compared with traditional communication systems. View full abstract»

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  • Efficient framing and ARQ for high-speed PLC systems

    Page(s): 27 - 31
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    In powerline communications (PLC) more so than in many other media, there is a strong interaction between the medium access control (MAC) layer and the physical (PHY) layer. This paper investigates one of the manifestations of this interaction, that of MAC framing and error recovery with PHY transmission characteristics. MAC framing for high-speed PLC systems should be capable of concatenating multiple MAC service data units (MSDUs, e.g., Ethernet or IP packets) in order to amortize the high and fixed overheads associated with each MAC protocol data unit (MPDU). By itself, this is easy. However, transmission errors may damage portions of an MPDU, which can further rob a system of efficiency. This paper presents a 2-level MAC framing mechanism that enables efficient retransmission of corrupted data. Both analytical and simulation results are used to compare the performance of the proposed MAC framing scheme with other existing viable approaches. The results show that the proposed scheme is significantly superior to existing approaches. A slightly modified version of this 2-level framing mechanism provided in this paper was used in the new generation 200 Mbps class homeplug standard, homeplug A V. View full abstract»

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  • On multicarrier signal transmission for high-voltage power lines

    Page(s): 32 - 36
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    Orthogonal frequency division multiplexing (OFDM), as a type of multicarrier modulation, is becoming one of the preferred communication schemes to achieve reliable high-rate data transmission. In this paper, we propose a multicarrier signal transmission system to be applied in a high-voltage power line scenario and we demonstrate the gain of the proposed scheme with respect to a single carrier power line modem in terms of achievable bit-rate for a given quality of service requirement. View full abstract»

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  • Robust and high-bit rate communications over PLC channels: a bit-loading multi-carrier spread-spectrum solution

    Page(s): 37 - 41
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    In this paper, we present a finite-granularity loading algorithm for multicarrier spread-spectrum modulation systems. The proposed scheme attempts to give a robust solution to the power line communication challenging task. Throughout the paper, the particular case of an adapted version of multi-carrier code-division-multiple-access (MC-CDMA) is considered, which is currently called spread-spectrum multicarrier multiple-access (SS-MC-MA). The presented algorithm assigns subcarriers, spreading codes, bits and energy per code to each user of the network in order to maximize the minimum data rate at a target symbol error rate (SER) and for a given power spectral density (PSD). Simulation results of the new scheme are presented for different measured PLC channels with impulsive noise and are compared with those of the classical discrete multitone modulation (DMT) approach. Then, it is shown that the proposed scheme offers higher throughput than DMT or less sensitiveness to impulse noise effects. View full abstract»

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  • An OFDMA based modem for powerline communications over the low voltage distribution network

    Page(s): 42 - 46
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1732 KB) |  | HTML iconHTML  

    The paper describes an OFDMA based modem for multiple access powerline communications (PLC) over the low-voltage distribution network. Relying on a preliminary characterization of the French PLC network, a complete description of the modem is given. It concerns in particular the data frame structure, subcarrier allocation to users, the bit loading algorithm used for symbol coding, synchronization, and equalization. The proposed system is evaluated through simulations carried out using a simplified noise model. View full abstract»

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  • A study on adaptive modulation of data spread OFDM

    Page(s): 47 - 51
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    An adaptive sub-carrier modulation in OFDM transmission is an effective scheme in order to increase transmission rate because it is possible for OFDM to determine a modulation scheme of each sub-carrier independently according to its channel state information. However, in this case, it is necessary to transmit allocation information of modulation from the transmitter to the receiver and this leads to degradation of performance. In this paper, an adaptive modulation scheme for OFDM that makes possible less information transmission from the transmitter to the receiver for allocation information is proposed. Moreover, sub-carrier power control is combined in order to improve performance further. As the result of theoretical analysis and simulation, better performance of the proposed scheme was confirmed. View full abstract»

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  • Subchannels allocation on multiple pDSL lines

    Page(s): 52 - 56
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    The pDSL technology is used for providing multiple, high-speed broadband links over power lines in the indoor environment This work addresses the problem of bandwidth allocation between the various links of a pDSL network and proposes an algorithm for determining the allocation of the various subchannels during network activation and periodically during the normal network operation. The paper also demonstrates the performance of the proposed algorithm using an illustrative example. View full abstract»

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  • Secure and reliable wide-area power-line communication for soft-real-time applications within REMPLI

    Page(s): 57 - 60
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    The REMPLI project aims at designing and implementing a communication infrastructure for distributed data acquisition and remote control operation using the power grid as the communication medium. Aside of being a platform for automated meter reading with high time resolution, energy management and domotic applications, and the system provides status information about the power grid and its components, thus improving maintenance quality. In this paper we give an overview about the features and abilities of the REMPLI system, we show the system architecture, and we analyze the position of REMPLI in the market of power-line communication systems. View full abstract»

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  • A power line communication stack for metering, SCADA and large-scale domotic applications

    Page(s): 61 - 65
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    This paper describes the communication stack of the REMPLI system: a structure using power-lines and IP-based networks for communication, for data acquisition and control of energy distribution and consumption. It is furthermore prepared to use alternative communication media like GSM or analog modem connections. The REMPLI system provides communication service for existing applications, namely automated meter reading, energy billing and domotic applications. The communication stack, consisting of physical, network, transport, and application layer is described as well as the communication services provided by the system. We show how the peculiarities of the power-line communication influence the design of the communication stack, by introducing requirements to efficiently use the limited bandwidth, optimize traffic and implement fair use of the communication medium for the extensive communication partners. View full abstract»

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  • Security concept for a wide-area low-bandwidth power-line communication system

    Page(s): 66 - 70
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    Remote meter reading and data acquisition is gaining importance. Especially in situations where easily accessible communication media are used or multiple service providers are involved, security concerns appear which must be considered during the system design phase. This paper describes the security concept for the REMPLI system, a power-line-based communication infrastructure used to connect metering and control equipment to centrally located application servers. To efficiently cope with potential security threats, an asset and risk analysis was conducted which formed the basis for the setup of an appropriate security architecture. In addition, this article tackles selected problems of key distribution and the secure handling of data within a security token. View full abstract»

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  • Clock synchronization in powerline networks

    Page(s): 71 - 75
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    Although most aspects of clock synchronization are well investigated, most studies focus on high-speed, highly reliable and topologically stable networks. For the synchronization of a distributed system networked using powerline, however, essential modifications are needed in order to cope with the peculiar behaviour of power line as a communication medium. One of these special properties is the non-stable network topology caused by load balancing of the energy suppliers; another is the non-symmetric communication delay, as opposed to the common symmetry assumption in most state-of-the-art synchronization protocols. Finally, it is well understood that high-accuracy clock synchronization needs a very tight coupling of the protocol to the physical layer. This paper investigates a concept for synchronization in a powerline network and describes an approach which is taking advantage of a special clock synchronization hardware working closely together with a powerline physical layer. View full abstract»

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  • Data transparency in PLC-based SCADA and metering protocols

    Page(s): 76 - 79
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    Using a power line network as communication middleware between existing SCADA or metering applications and field devices, both not prepared to communicate over PLC, puts the burden on the communication system to ensure reliable communication within the timing constraints of the already existing protocols and devices. In this paper we show how the REMPLI communication system deals with the issues that arise when data transfer over multiple communication paths in the same communication medium is demanded together with the support of different, redundant communication media like ISDN or GSM while at the same transparently transporting application protocol requests, which the system is either not able or not allowed to modify. View full abstract»

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  • Influence of single frequency network transmission on the physical layer of a multi carrier modulation system

    Page(s): 80 - 84
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    The application requirements and existing experience in the PLC market show that it is necessary to cover large areas or long distances. In these kinds of PLC networks repeaters are necessary. A single frequency network, however, allows a very simple repeater concept, e.g.: all participants who have correctly received a packet from the master retransmit this packet at the same time, i.e. in the next time slot, which is reserved for the repetition, on the same medium and the same frequency. iAd has already presented a paper on this item at the ISPLC 2002(G. Bumiller, 2002) . The new paper now analyses the influence of transmission in a single frequency network on the physical layer of a multi carrier system. Several transmitters at various locations transmit identical information on the same medium and the same frequencies at the same time. The receivers see the superposition of the signals. In the first paper we showed, that it is possible to understand this superposition in the same way as multi path propagation and the bandwidth of the system has to be broad enough to overcome the notches of the transfer function on certain frequencies. Yet, in some cases it is not possible to meet this requirement. Furthermore, there are additional effects on the physical layer if phase and frequency of transmitters differ. These effects depend on each other and will be analysed. Due to these effects, the frequencies of the notches in the transfer function change over time. The paper discusses possibilities to use these effects for systems with smaller bandwidth. Here, the repetitions allow other concepts than used by broadcast systems. View full abstract»

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  • A decoding for low density parity check codes over impulsive noise channels

    Page(s): 85 - 89
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    Power line channel often suffers from impulsive interference generated by electrical appliances. Therefore, power line communication makes degradation due to such impulsive interference. We introduce Middleton's class a noise model into a statistical model of impulsive noise environment. In this paper, we apply LDPC (low density parity check) codes and sum-product decoding to additive white class a noise (AWAN) channels. We propose a sum-product decoding which is suitable for AWAN channels. In addition, we show the BER (bit error rate) performance of the proposed sum-product decoding in class a noise environment by computer simulation. View full abstract»

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