Coordinated Multipoint Trials in the Downlink

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Executive Summary

Coordinated Multi-Point (CoMP) is a new class of transmission schemes for interference reduction in the next generation of mobile networks. The authors have implemented and tested a distributed CoMP transmission approach in the downlink of an LTE-Advanced trial system operating in real time over 20 MHz bandwidth. Enabling features such as network synchronization, cell- and user-specific pilots, feedback of multi-cell channel state information and synchronous data exchange between the base stations have been implemented. Interference-limited transmission experiments have been conducted using optimum combining with interference-aware link adaptation and cross-wise interference cancellation between the cells.

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