Within the last few years there has been significant interest in the Power Line Telecommunication (PLT) based on the Orthogonal Frequency Division Multiplexing (OFDM) technique . The majority of the research effort has concerned the performance of various modulation and coding schemes in the power line environment. Most of these capacity analysis concentrate simply on transmis- sion characteristics , and do not consider the real time operation of the system under a stochastically varying traffic load. In this paper we define suitable different data transmission speed classes. We have determined an effective capacity value for each class. Using these values it is easy to calculate the required capacity for a new user or to check whether a newly joining user will cause the degradation of the network performance under a certain Quality of Service (QoS) limit. These effec- tive capacity values allow simple PLT network design as well
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