Bit and Power Allocation in Constrained Multicarrier Systems: The Single-User Case

Παπανδρεου, Νικολαοσ; Antonakopoulos, Theodore

doi:10.1155/2008/643081

Cited by 100 publications

(85 citation statements)

References 18 publications

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“…However, since we obtain the global optimum for each sub-problem, the proposed AO algorithm converges to a stationary point of the objective function (15). This conclusion has been proved in Appendix 3 and verified by simulation examples in Section 8.…”

Section: Converge Of the Ao Algorithmsupporting

confidence: 57%

“…6 Signaling path gains see Fig. 9 Normalized path gains see Fig. 10 This indicates that θ {n} is a stationary point of (15).…”

Section: Discussionmentioning

confidence: 96%

“…As reported in [15] that to meet the ASC constraint on this traffic direction, the optimal power allocation at T 1 is the classical water-filling algorithm. In the second phase, the terminal T 2 replies information signal X…”

Section: Numerical Examplesmentioning

confidence: 99%

“…In the conventional one-way direct transmission (DT) system, the rate maximization (RM) and margin maximization (MM) problems are of duality to each other and admit a unique water-filling solution [15]. However, this fact does not hold when a relay node has been introduced.…”

Section: Introductionmentioning

confidence: 99%

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Joint terminals and relay optimization for two-way power line information exchange systems with QoS constraints

Rong

2015

EURASIP J. Adv. Signal Process.

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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.

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Section: Converge Of the Ao Algorithmsupporting

confidence: 57%

“…6 Signaling path gains see Fig. 9 Normalized path gains see Fig. 10 This indicates that θ {n} is a stationary point of (15).…”

Section: Discussionmentioning

confidence: 96%

Section: Numerical Examplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Joint terminals and relay optimization for two-way power line information exchange systems with QoS constraints

Rong

2015

EURASIP J. Adv. Signal Process.

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“…The algorithm is performed iteratively until the remaining power budget is not enough to increase the data rate in any band. This algorithm is similar to the bit-loading technique found in the literature, e.g., [10] and references therein.…”

Section: B Greedy Algorithmmentioning

confidence: 98%

Power Allocation for Multiband Coded OFDM Systems with Limited Feedback

Nguyen

Choi

et al. 2011

2011 IEEE Vehicular Technology Conference (VTC Fall)

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Abstract-In this paper, we study the power allocation for multiband coded OFDM systems. With limited feedback, we propose an effective power allocation method across OFDM bands to maximize the throughput and achieve the quality of service target. To facilitate the proposed method, two optimization algorithms based on greedy and dynamic programming principles are discussed. The trade-off between performance and complexity is provided. Simulation results show that the proposed power allocation mechanism allows a signal to noise ratio gain of 2 dB at a goodput of 2.5 bit per second per Hz over the multiband OFDM systems with equal power allocation.

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