Abstract
The quality-of-service (QoS) criteria (measured in terms of the minimum capacity requirement in this paper) are very important to practical indoor power line communication (PLC) applications as they greatly affect the user experience. With a two-way multicarrier relay configuration, in this paper we investigate the joint terminals and relay power optimization for the indoor broadband PLC environment, where the relay node works in the amplify-and-forward (AF) mode. As the QoS-constrained power allocation problem is highly non-convex, the globally optimal solution is computationally intractable to obtain. To overcome this challenge, we propose an alternating optimization (AO) method to decompose this problem into three convex/quasi-convex sub-problems. Simulation results demonstrate the fast convergence of the proposed algorithm under practical PLC channel conditions. Compared with the conventional bidirectional direct transmission (BDT) system, the relay-assisted two-way information exchange (R2WX) scheme can meet the same QoS requirement with less total power consumption.
Highlights
With the emerging concept of smart grid, communication infrastructures used in the power grid have received much research interest recently
Depending on the signal processing used at the relay node, relay transmission systems can be classified into two groups, namely regenerative and non-regenerative relay systems
The problem formulated is a joint optimization of power allocation between two terminals and one relay node, subjecting to minimum capacity requirements on each traffic direction
Summary
With the emerging concept of smart grid, communication infrastructures used in the power grid have received much research interest recently. The authors of [12] considered an AF scheme for two-way relaying over orthogonal frequency-division multiplexing (OFDM) system They performed power allocation at the relay and both terminals, as well as tone permutation at the relay node, in order to maximize the sum capacity. We set the QoS criteria as the lower-bounds of the capacity of the data traffic from one terminal to the other Since this QoS-constrained power allocation problem is highly non-convex, the globally optimal solution is computationally intractable to obtain. The problem formulated is a joint optimization of power allocation between two terminals and one relay node, subjecting to minimum capacity requirements on each traffic direction. 1st phase 2nd phase (a) Fig. 2 a R2WX system; b conventional BDT system (b) time
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