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The authors study the effects of residual Carrier Frequency Offset (CFO) on the performance of the distributed Zero-Forcing (ZF) beamformer. Coordinated transmissions, where multiple cells cooperate to simultaneously transmit toward one or multiple receivers, have gained much attention as a means to provide the spectral efficiency and data rate targeted by emerging standards. Such schemes exploit multiple transmitters to create a virtual array of antennas to mitigate the co-channel interference and provide the gains of multi-antenna systems. Here, they focus on a distributed scenario where the transmit nodes share the same data but have only the local knowledge of the channels.
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