Mobility Investigate

A WiMAX-Based Implementation of Network MIMO for Indoor Wireless Systems

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Executive Summary

It is well known that Multiple-Input Multiple-Output (MIMO) techniques can bring numerous benefits, such as higher spectral efficiency, to point-to-point wireless links. More recently, there has been interest in extending MIMO concepts to multiuser wireless systems. The focus in this paper is on network MIMO, a family of techniques whereby each end user in a wireless access network is served through several access points within its range of influence. By tightly coordinating the transmission and reception of signals at multiple access points, network MIMO can transcend the limits on spectral efficiency imposed by cochannel interference. Taking prior information-theoretic analyses of network MIMO to the next level, one quantifies the spectral efficiency gains obtainable under realistic propagation and operational conditions in a typical indoor deployment.

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