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Base station cooperation improves the sum-rates that can be achieved incellular systems. Conventional cooperation techniques require sharing largeamounts of information over finite-capacity backhaul links and assume that basestations have full channel state information (CSI) of all the active users inthe system. In this paper, a new limited feedback strategy is proposed formulticell beamforming where cooperation is restricted to sharing only the CSIof active users among base stations. The system setup considered is a lineararray of cells based on the Wyner model. Each cell contains single-antennausers and multi-antenna base stations. Closed-form expressions for thebeamforming vectors that approximately maximize the sum-rates in a multicellsystem are first presented, assuming full CSI at the transmitter. For the morepractical case of a finite-bandwidth feedback link, CSI of the desired andinterfering channels is quantized at the receiver before being fed back to thebase station. An upper bound on the mean loss in sum rate due to random vectorquantization is derived. A new feedback-bit allocation strategy, to partitionthe available bits between the desired and interfering channels, is developedto approximately minimize the mean loss in sum-rate due to quantization. Theproposed feedback-bit partitioning algorithm is shown, using simulations, toyield sum-rates close to the those obtained using full CSI at base stations.

Adaptive Limited Feedback for Sum-Rate Maximizing Beamforming in Cooperative Multicell Systems