NAF, OAF, or noncooperation: which protocol to choose?
EURASIP Journal on Advances in Signal Processing
Energy balancing cooperative diversity for wireless sensor networks
International Journal of Communication Networks and Distributed Systems
EURASIP Journal on Wireless Communications and Networking - Special issue on optimization techniques in wireless communications
A distributed on-off amplify-and-forward protocol for the fading parallel relay channel
IEEE Communications Letters
Power allocation in wireless multi-user relay networks
IEEE Transactions on Wireless Communications
Impact of CSI on distributed space-time coding in wireless relay networks
IEEE Transactions on Wireless Communications
Adaptive power allocation for regenerative relaying with multiple antennas at the destination
IEEE Transactions on Wireless Communications
A correction in "distributed adaptive power allocation for wireless relay networks"
IEEE Transactions on Wireless Communications
Single and multiple relay selection schemes and their achievable diversity orders
IEEE Transactions on Wireless Communications
Distributed power allocation schemes for amplify-and-forward networks
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Joint allocation of power and subcarriers for OFDMA relay network
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
A new relay selection scheme for wireless relay networks
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Optimal power allocation for DAF cooperative communication with multiple relays
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
A novel relay selection scheme with simplified power allocation for wireless relay networks
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
On the optimal power control of parallel OFDM relaying networks
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Power allocation for beamforming relay networks under channel uncertainties
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Modulation-adaptive cooperation in Rayleigh fading channels with imperfect CSI
Proceedings of the 6th International Wireless Communications and Mobile Computing Conference
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Centralized and distributed power allocation in multi-user wireless relay networks
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Power-optimized multi-hop multi-branch amplify-and-forward cooperative systems
ISWPC'10 Proceedings of the 5th IEEE international conference on Wireless pervasive computing
IEEE Communications Letters
Adaptive resource allocation in multiuser cooperative networks with proportional rate constraints
International Journal of Sensor Networks
Wireless Communications & Mobile Computing
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In this paper, we consider a 2-hop wireless diversity relay network. We explore transmit power allocation among the source and relays to maximize the received signal to noise ratio (SNR) at the destination. We consider two relay protocols, "amplify and forward" (AAF) and "decode and forward" (DAF) and design the respective power allocations for both uneeded and coded systems. For a 2-hop relay system with one relay node, we derive a closed-form power allocation solution and, based on it, we propose a relay activation condition. If and only if the fading channel coefficients satisfy this condition, the relay transmits the signals to the destination; otherwise, the relay will stay in the idle state. For a system with more than one relay node, general closed-form power allocation solutions based on an exact SNR expression are difficult to derive; we hence, calculate a SNR upper bound and derive a sub-optimum power allocation solution based on this bound. The simulation results show that for a 2-hop diversity relay channel with one relay node the proposed adaptive power allocation (APA) scheme yields about 1- 2 dB SNR gains compared to the equal power allocation. This SNR gain increases monotonically as the number of relays increases