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Base station coordination is envisioned as a key technology in future mobile networks. It reduces the interference between adjacent cells and promises enhancement of spectral efficiency. However, little is known about the penalties due to impairments. Channel errors may be caused by channel estimation, feedback delay as well as by synchronization errors among the base stations. Hence, the computation of the pre-coder relies on imprecise information and the orthogonality between the user data is disturbed. In this paper, the authors give an overview on potential impairment effects. They derive an accurate signal model capturing the effect of synchronization impairments depending on the feedback delay.
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