Broadband Power-Line Communications: The Channel Capacity Analysis

• Published in: IEEE transactions on power delivery Vol. 23; no. 1; pp. 164 - 170
• Main Authors: Anatory, J., Theethayi, N., Thottappillil, R., Kissaka, M.M., Mvungi, N.H.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.01.2008; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Additive white noise; Applied sciences; AWGN; Branched network; Broadband; Broadband communication; broadband power line; Channel capacity; Channels; Conductors; Density; Electrical engineering. Electrical power engineering; Electrical power engineering; Exact sciences and technology; frequency response; Gaussian noise; Grounds; Impedance; Indoor; indoor channel; low-voltage (LV) channel; Medium voltage; medium-voltage (MV) channel; Miscellaneous; multipath; Power networks and lines; power-line channel; Spectra; TECHNOLOGY; TEKNIKVETENSKAP; Terminals; transfer function; Transfer functions; Transformers; Users connections and in door installation; Electric energy transportation; indoor channel; Characteristic impedance; multipath; channel capacity; Power spectral density; Data transmission; Wide band transmission; low-voltage (LV) channel; Load impedance; Low voltage; Branched network; broadband power line; Indoor installation; Wide band; Carrier transmission on power lines; Medium voltage; medium-voltage (MV) channel; Frequency response; Transfer function; power-line channel; Power transmission line
• ISSN: 0885-8977; 1937-4208; 1937-4208
• DOI: 10.1109/TPWRD.2007.911001

The power line has been proposed as a solution to deliver broadband services to end users. Various studies in the recent past have reported a decrease in channel capacity with an increase in the number of branches for a given channel type whether it is an indoor or low-voltage (LV) or medium-voltage (MV) channel. Those studies, however, did not provide a clear insight as to how the channel capacity is related to the number of distributed branches along the line. This paper attempts to quantify and characterize the effects of channel capacity in relation to the number of branches and with different terminal loads for a given type of channel. It is shown that for a power spectral density (PSD) between 90 dBm/Hz to 30 dBm/Hz, the channel capacity decreases by a 20-30 Mb/s/branch, 14-24 Mb/s/branch, and a 20-25 Mb/s/branch for an MV channel, LV channel, and indoor channel, respectively. It is also shown that the channel capacity is minimum when the load impedance is terminated in characteristic impedances for any type of channel treated here. It is shown that there could be a significant loss in channel capacity if a ground return was used instead of a conventional adjacent conductor return. The analysis presented in this paper would help in designing appropriate power-line communication equipment for better and efficient data transfer.