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Decentralized Collaborative Uplink Beamforming with Robustness Against Channel Mismatches

We present a distributed algorithm for collaborative uplink transmit beamforming that provides robustness against uncertainties in the channel state information. Our algorithm is derived using the available information about the second-order statistics of the channel and the possibly erroneous channel state. It can be applied to both line-of-sight propagation and flat fading channels. The beamforming coefficients of each terminal are computed locally using the available information about its channel and a single parameter that is broadcasted from the base station to all the cooperating terminals.