Wessam Mesbah and Timothy N. Davidson,
Power and resource allocation for orthogonal multiple access
relay systems.
EURASIP Journal on Advances in Signal Processing,
Article
ID 476125, 15 pages, 2008. doi:10.1155/2008/476125.
(Special issue on: Wireless Cooperative Networks).
We study the problem of joint power and channel resource allocation for orthogonal multiple access relay (MAR) systems in order to maximize the achievable rate region. Four relaying strategies are considered; namely, regenerative decode-and-forward (RDF), nonregenerative decode-and-forward (NDF), amplify-and-forward (AF), and compress-and-forward (CF). For RDF and NDF we show that the problem can be formulated as a quasiconvex problem, while for AF and CF we show that the problem can be made quasiconvex if the signal-to-noise ratios of the direct channels are at least -3 dB. Therefore, efficient algorithms can be used to obtain the jointly optimal power and channel resource allocation. Furthermore, we show that the convex subproblems in those algorithms admit a closed-form solution. Our numerical results show that the joint allocation of power and the channel resource achieves significantly larger achievable rate regions than those achieved by power allocation alone with fixed channel resource allocation. We also demonstrate that assigning different relaying strategies to different users together with the joint allocation of power and the channel resources can further enlarge the achievable rate region.
This paper went through five rounds of galley proofs. Unfortunately, even at that late stage some new errors were introduced. In particular, the optimization problem in (11) has been copied from the problem for the NDF case in (8), and does not apply to the CF case. However, this error is purely typographical, and the rest of the derivation for the CF case is correct. For convenience, the correct statement of the problem in (11) has been provided in the corrigenda for this paper (pdf file).
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