Title :
Relay Power Optimization for Wireless Cooperative Networks over OFDM Fading Channels
Author :
Wang, Di ; Li, Zhaoquan ; Wang, Xin
Author_Institution :
Dept. of Comput. & Electr. Eng. & Comput. Sci., Florida Atlantic Univ., Boca Raton, FL, USA
Abstract :
We consider adaptive subcarrier assignment and fair power control strategy that minimizes a cost function of average relay powers for multi-user wireless OFDM networks, where relays assist communication between sources and destinations with an amplify-and-forward strategy. Using a class of beta-fair cost functions to balance the tradeoff between energy efficiency and fairness, jointly optimal subcarrier and power allocation schemes at the relays are derived in the quasi-closed form. In addition, we develop novel stochastic optimization algorithms capable of dynamically learning the intended wireless channels on-the-fly to approach the optimal policy. Numerical results are provided to evaluate the proposed schemes for multi-user OFDM relay networks over block fading channels.
Keywords :
OFDM modulation; amplify and forward communication; cooperative communication; fading channels; multi-access systems; stochastic processes; OFDM fading channels; adaptive subcarrier assignment; amplify-and-forward strategy; beta-fair cost functions; block fading channels; energy efficiency; fair power control strategy; multiuser wireless OFDM networks; optimal subcarrier; power allocation; relay power optimization; stochastic optimization algorithms; wireless cooperative networks; Cost function; Fading; OFDM; Power control; Relays; Resource management; Wireless communication;
Conference_Titel :
Global Telecommunications Conference (GLOBECOM 2011), 2011 IEEE
Conference_Location :
Houston, TX, USA
Print_ISBN :
978-1-4244-9266-4
Electronic_ISBN :
1930-529X
DOI :
10.1109/GLOCOM.2011.6133772