Mobility

Dynamic Cooperation Link Selection for Network MIMO Systems With Limited Backhaul Capacity

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Executive Summary

Base-Station (BS) cooperation in wireless cellular networks offers a promising approach for interference mitigation. However, the implementation of practical network Multi-Input Multi-Output (MIMO) system also faces the challenge of high capacity cost for sharing the user data over the backhaul connections. This paper considers a downlink multi-cell Orthogonal Frequency-Division Multiple-Access (OFDMA) network where the capacities of the backhaul links between the BSs are limited, and extends the single-antenna BS multi-cell system model considered in the authors' previous work to the multiple-antenna BS case. The BSs use zero-forcing precoding to spatially multiplex multiple users within each cell and to pre-subtract the interference from cooperating BSs that share user data with them.

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