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Multi-cellular radio systems are often limited due to the presence of co-channel interference. Proposed physical layer concepts, e.g., coordinated joint transmission and interference rejection combining, try to strengthen the signal while combating the interference. It is well known that base station cooperation yields great capacity improvement for downlink multi-antenna cellular networks. However, the proposed solutions assume a central processing unit, coordinating the information exchange and thus determining the optimal resource allocation of the overall cellular network. Recently multi-user eigen-mode transmission was proposed to relax the constraint of channel state information at the transmitter. It requires the terminals to feed back their dominant eigen-modes only.
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