Computer Science – Information Theory
Scientific paper
2012-03-07
Computer Science
Information Theory
Submitted to IEEE Transactions on Communications
Scientific paper
We derive the optimal power allocation of a practical half-duplex scheme for the multiple access channel with transmitter cooperation (MAC-TC). The system consists of two users in half-duplex mode communicating with one destination over a complex channel with additive white Gaussian noise. The transmission scheme is performed over 3 time slots, such that the users exchange part of their information during the first 2 and cooperatively transmit their information to the destination during the last time slot. This scheme is near capacity-achieving when the inter-user links are stronger than the links between the users and destination, it also includes partial decode-forward relaying as a special case. We propose efficient algorithms to find the optimal power allocation for maximizing either the individual or the sum rate and identify the corresponding optimal scheme for each channel configuration. As the inter-user link qualities increase, the optimal scheme moves from no cooperation to partial cooperation then to full cooperation, in which the users fully exchange their information and cooperatively send it to the destination.
Al Haija Ahmad Abu
Vu Mai
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