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Abstract
In this article, we investigate the use of half duplex time division relay protocols to possibly provide achievable rate improvements, power saving, and coverage extension in home power line communication (PLC) networks. We consider a network where the communication between the source and the destination nodes follows an opportunistic protocol, namely, the relay is used whenever it allows with respect to the direct transmission: (a) for achievable rate improvements, under a power spectral density (PSD) mask constraint; or (b) for power saving, under a PSD mask and a rate target constraint. Opportunistic decode and forward (ODF), and opportunistic amplify and forward (OAF) are considered. At the physical layer, we assume the use of multi-carrier modulation. Under these assumptions, we find the optimal resource allocation, namely, the optimal power and time slot allocation, between the source and the relay nodes that maximizes the achievable rate, or minimizes the total transmitted power for both ODF and OAF. For the power minimization problem of ODF, we show that the joint problem of power and time slot allocation of DF is very hard to be solved and thus implemented. Therefore, to reduce complexity, we propose a simplified algorithm that considers two convex sub-problems. Through numerical results, we show that its performance is very close to the optimum. Finally, since over in-home PLC networks, the relay can only be placed in accessible points of the network, i.e., in outlets, or in the main panel, or in derivation boxes, for each opportunistic protocol, we also investigate the influence on performances from the relay position. Results are obtained using both measured channel responses and generated ones; thanks to the use of a statistically representative simulator. They show that significant rate improvements and power savings can be obtained as a function of the relay position and network size.
Highlights
Power saving is playing an important role in developments of advanced communication devices
We investigate the use of cooperative half duplex time division relay protocols to possibly provide power savings, achievable rate improvements, and coverage extension to the in-home power line communication (PLC) networks whose communication devices adopt multi-carrier modulation at the physical (PHY) layer, i.e., orthogonal frequency division multiplexing (OFDM) [1]
We have investigated the use of half duplex time division Opportunistic decode and forward (ODF) and opportunistic amplify and forward (OAF) relay protocols to provide achievable rate improvements, power saving, and coverage extension over in-home PLC networks
Summary
Power saving is playing an important role in developments of advanced communication devices. As it is typically required by state-of-the-art communication standard, e.g., the wireless IEEE 802.11 standard, the power line IEEE P1901 standard, and the twisted pair xDSL standard, we assume that the signal transmitted by the network nodes has to satisfy a power spectral density (PSD) mask Under these assumptions and Gaussian noise model, we find the optimal resource allocation, namely, the optimal power and time slot allocation, at the source and relay nodes that maximizes achievable rate, or minimizes the total transmitted power for both ODF and OAF. In-home power line network topology As discussed in the Introduction, we are interested to see whether achievable rate improvements, power savings, and coverage extension are attainable through the use of ODF and OAF To this end, in the following, we describe a typical PLC network topology, which allows for understanding where relays can be placed, and it highlights the differences with the wireless context. It is representative of the majority of Italian and EU residential wiring structures [21]
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