{"title":"The Effects of Multipath on OFDM Systems for Broadband Power-Line Communications a Case of Medium Voltage Channel","authors":"Justinian Anatory, N. Theethayi, R. Thottappillil, C. Mwase, N.H. Mvungi","volume":30,"journal":"International Journal of Information and Communication Engineering","pagesStart":1272,"pagesEnd":1276,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/2909","abstract":"
Power-line networks are widely used today for broadband data transmission. However, due to multipaths within the broadband power line communication (BPLC) systems owing to stochastic changes in the network load impedances, branches, etc., network or channel capacity performances are affected. This paper attempts to investigate the performance of typical medium voltage channels that uses Orthogonal Frequency Division Multiplexing (OFDM) techniques with Quadrature Amplitude Modulation (QAM) sub carriers. It has been observed that when the load impedances are different from line characteristic impedance channel performance decreases. Also as the number of branches in the link between the transmitter and receiver increases a loss of 4dB\/branch is found in the signal to noise ratio (SNR). The information presented in the paper could be useful for an appropriate design of the BPLC systems.<\/p>\r\n","references":"[1] J. Anatory, N. Theethayi, R. Thottappillil, M. M. Kissaka, and N. H.\r\nMvungi, \"The influence of load impedance, line length and branches on\r\nunderground cable power-line communications (PLC) systems,\" IEEE\r\nTrans. Power Del., vol. 23, no. 1, pp. 180-187, Jan. 2008.\r\n[2] J. Anatory, N. Theethayi, R. Thottappillil, M. M. Kissaka, and N. H.\r\nMvungi, \"The effects of load impedance, line length and branches in the\r\nBPLC-transmission lines analysis for medium voltage channel,\" IEEE\r\nTrans. Power Del., vol. 22, no. 4, pp. 2156-2162, Oct. 2007.\r\n[3] J. Anatory, N. Theethayi, R. Thottappillil, M. M. Kissaka, and N. H.\r\nMvungi, \"The effects of load impedance, line length and branches in the\r\nBPLC-transmission lines analysis for indoor voltage channel,\" IEEE\r\nTrans. Power Del., vol. 22, no. 4, pp. 2150-2155, Oct. 2007.\r\n[4] R. Prasad, OFDM for Wireless Communications Systems, Boston, MA,\r\nArtech House, 2004.\r\n[5] P. Amirshahi, and M. Kavehrad, \"High-Frequency Characteristics of\r\nOverhead Multiconductor Power Lines for Broadband\r\nCommunications\", IEEEE Journal on Selected Areas in\r\nCommunications, Vol. 24, No. 7, July 2006, pp. 1292-1303.\r\n[6] M. Babic, J. Baush, T. Kistner and K. Dostert, \"Performance Analysis of\r\nCoded OFDM Systems at Statistically Representative PLC Channels,\r\nIEEE-ISPLC 2006, , pp 104-109, Orlando, FL, 2006.\r\n[7] J. Anatory, M.M. Kissaka and N.H. Mvungi, \"Channel Model for\r\nBroadband Powerline Communication\", IEEE Trans. On Power\r\nDelivery, Vol. 22, no. 1, January 2007, pp. 135-141.\r\n[8] J. Anatory, N. Theethayi, R. Thottappillil, M.M. Kissaka and N.H.\r\nMvungi, \"An Experimental Validation for Broadband Power-Line\r\nCommunication (BPLC) Model\", IEEE Transactions on Power Delivery,\r\nVol. 23, no. 3, July 2008, pp. 1380-1383.\r\n[9] T. Fukami, D. Umehara, M. Kawai, and Y. Morihiro, \"Noncoherent PSK\r\nOptimum Receiver over Impulsive Noise Channels\", International\r\nSympoium of Information Theory and Its Applications 2002, Xi-an,\r\nPRC, pp. 235-238, Oct. 2002.\r\n[10] D. Middleton, .Statistical-physical model of electromagnetic\r\ninterference, IEEE Trans. Electromagnetic Compat., vol. EMC-19, no. 3,\r\npp. 106.126, August 1977.\r\n[11] J. G. Proakis, \"Digital Communications\" McGraw-Hill International\r\nEdition, Fourth Edition, 2001.\r\n[12] P. Amirshashi, S. M. Navidpour and M. Kavehrad, \"Performance\r\nAnalysis of Uncoded and Coded OFDM Broadband Transmission Over\r\nLow Voltage Power-Line Channels with Impulsive Noise, IEEE\r\nTransactions on Power Delivery, Vol. 21, No. 4, October, 2006.\r\n[13] L. Ahlin, J. Zander and B. Slimane, Principles of Wireless\r\nCommunications\", Denmark Narayana Press, 2006.\r\n[14] L. Litwin and M, Pugel, \"The Principles of OFDM\", www.\r\nRfdesign.com, 2001.\r\n[15] A. Goldsmith, Wireless Communications, Cambridge University Press,\r\n2005.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 30, 2009"}