Power Control for User Cooperation

Details Power Control for User Cooperation Power Control for User Cooperation

2006-01-30

arxiv.org/abs/cs/0601124v1

Computer Science

Information Theory

Submitted to IEEE Transactions on Wireless Communications, October 2005

Scientific paper

For a fading Gaussian multiple access channel with user cooperation, we obtain the optimal power allocation policies that maximize the rates achievable by block Markov superposition coding. The optimal policies result in a coding scheme that is simpler than the one for a general multiple access channel with generalized feedback. This simpler coding scheme also leads to the possibility of formulating an otherwise non-concave optimization problem as a concave one. Using the channel state information at the transmitters to adapt the powers, we demonstrate significant gains over the achievable rates for existing cooperative systems.

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