TY - JOUR
T1 - Power allocations in minimum-energy SER-constrained cooperative networks
AU - Maham, Behrouz
AU - Hjørungnes, Are
AU - Debbah, Mérouane
N1 - Funding Information:
This work was supported by the Research Council of Norway through the project 176773/S10 entitled “Optimized Heterogeneous Multiuser MIMO Networks—OptiMO” and the AURORA project entitled “Communications under uncertain topologies”. Preliminary version of a portion of this work appeared in Proc. IEEE Vehicular Technology Conference (VTC 2008-Spring).
PY - 2009/8
Y1 - 2009/8
N2 - In this paper, we propose minimum power allocation strategies for repetition-based amplify-and-forward (AF) relaying, given a required symbol error rate (SER) at the destination. We consider the scenario where one source and multiple relays cooperate to transmit messages to the destination. We derive the optimal power allocation strategy for two-hop AF cooperative network that minimizes the total relay power subject to the SER requirement at the destination. Two outstanding features of the proposed schemes are that the power coefficients have a simple solution and are independent of knowledge of instantaneous channel state information (CSI). We further extend the SER constraint minimum power allocation to the case of multibranch, multihop network and derive the closed-form solution for the power control coefficients. For the case of power-limited relays, we propose two iterative algorithms to find the power coefficients for the SER constraint minimum-energy cooperative networks. However, this power minimization strategy does not necessarily maximize the lifetime of battery-limited systems. Thus, we propose two other AF cooperative schemes which consider the residual battery energy, as well as the statistical CSI, for the purpose of lifetime maximization. Simulations show that the proposed minimum power allocation strategies could considerably save the total transmitted power compared to the equal transmit power scheme.
AB - In this paper, we propose minimum power allocation strategies for repetition-based amplify-and-forward (AF) relaying, given a required symbol error rate (SER) at the destination. We consider the scenario where one source and multiple relays cooperate to transmit messages to the destination. We derive the optimal power allocation strategy for two-hop AF cooperative network that minimizes the total relay power subject to the SER requirement at the destination. Two outstanding features of the proposed schemes are that the power coefficients have a simple solution and are independent of knowledge of instantaneous channel state information (CSI). We further extend the SER constraint minimum power allocation to the case of multibranch, multihop network and derive the closed-form solution for the power control coefficients. For the case of power-limited relays, we propose two iterative algorithms to find the power coefficients for the SER constraint minimum-energy cooperative networks. However, this power minimization strategy does not necessarily maximize the lifetime of battery-limited systems. Thus, we propose two other AF cooperative schemes which consider the residual battery energy, as well as the statistical CSI, for the purpose of lifetime maximization. Simulations show that the proposed minimum power allocation strategies could considerably save the total transmitted power compared to the equal transmit power scheme.
KW - Constrained cooperative networks
KW - Power allocation strategies
KW - Symbol error rate
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U2 - 10.1007/s12243-009-0099-9
DO - 10.1007/s12243-009-0099-9
M3 - Article
AN - SCOPUS:68449088800
VL - 64
SP - 545
EP - 555
JO - Annales des Telecommunications
JF - Annales des Telecommunications
SN - 0003-4347
IS - 7-8
ER -