Distributed Rate Adaptation and Power Control in Fading Multiple Access Channels

Distributed power allocation in fast fading MIMO multiple access channels

In this paper we design distributed power allocation algorithms for multiple access channels. Considering competing transmitting users, equipped with several antennas each and common multiple antennas at the receiver, a game theoretic framework is conducted to derive the optimum precoding matrices such that each user maximizes his own ergodic transmission rate from the sole knowledge of the ove...

Optimal power control in multiple access fading channels with multiple antennas

This paper characterizes the optimal power control method for maximum sum capacity in a multiple access fading channel with multiple transmitter and receiver antennas when perfect channel side information is available at both the transmitters and the receiver. The profound benefit of multi-antenna diversity is demonstrated by a dimension counting argument. The optimal power allocation strategy ...

Optimum Power and Rate Allocation Strategies for Multiple Access Fading Channels

We obtain the (Shannon) optimal power and rate allocation strategies for the uplink on single cell systems. For an N user system, we show that successive decoding which is independent of channel state is optimal in the Shannon sense. Using this result, we frame a simple N dimensional convex optimization problem, which is solved to obtain optimum power and rate allocation as explicit functions o...

Full Rate Collaborative Diversity Scheme for Multiple Access Fading Channels

User cooperation is a well-known approach to achieve diversity without multiple antennas, however at the cost of inevitable loss of rate mostly due to the need of additional channels for relaying. A new collaborative diversity scheme is proposed here for multiple access fading channels to attain full rate with near maximum diversity. This is achieved by allowing two users and their correspondin...

Minimizing Transmit Power for Fading Multiple-Access Channels