Fundamentals of wireless communication
Fundamentals of wireless communication
Single parameter optimization approach to the optimal power allocation of OFDM relaying system
ICASSP '09 Proceedings of the 2009 IEEE International Conference on Acoustics, Speech and Signal Processing
Practical algorithms for a family of waterfilling solutions
IEEE Transactions on Signal Processing
Distributed Adaptive Power Allocation for Wireless Relay Networks
IEEE Transactions on Wireless Communications
Improving amplify-and-forward relay networks: optimal power allocation versus selection
IEEE Transactions on Wireless Communications
Distributed power allocation strategies for parallel relay networks
IEEE Transactions on Wireless Communications
Subcarrier-pair based resource allocation for cooperative multi-relay OFDM systems
IEEE Transactions on Wireless Communications
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We investigate the power allocation problem for dual-hop parallel OFDM relaying networks where an aggregate power constraint is imposed on all of the amplify-and-forward relays. Based on Y. Zhao et al's recent work, we first formulate the problem to how to optimally allocate the total power among all subcarriers such that the system instantaneous information rate is maximized, then we decompose it into a group of subproblems which can be solved with Lagrange multiplier method. Considering the prohibitive complexity to calculate the optimal solution, we further propose a low-complexity iterative algorithm to construct a suboptimal solution which converges very quickly. The simulation results show the performance gap between suboptimal and the optimal solutions is negligible.