Wireless Communications
Fundamentals of wireless communication
Fundamentals of wireless communication
Capacity of fading channels with channel side information
IEEE Transactions on Information Theory
Fading channels: information-theoretic and communications aspects
IEEE Transactions on Information Theory
IEEE Transactions on Information Theory
On the capacity of some channels with channel state information
IEEE Transactions on Information Theory
Opportunistic beamforming using dumb antennas
IEEE Transactions on Information Theory
Opportunistic transmission using large scale channel effects
IEEE Transactions on Communications
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We derive the optimal power control strategy to maximize the sum rate of a multiple access channel with two time-scale fading, where transmitters have access to each of the other usersý ýslowý fading information and the statistics of the ýfastý fading, but no knowledge of the instantaneous fast fading states. Assuming identical fast fading distributions for all users, it is found that the optimal strategy is to let at most one user transmit, with the user transmitting the one with the ýbestý slow fading conditions. An example with users undergoing lognormal shadowing and Rayleigh fast fading is considered, and capacity comparisons made. Simple sub-optimal power control schemes which provide close to optimal performance in certain favorable channel conditions are also proposed and analysed.