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Dynamic Feedback Allocation Algorithms for Interference Management in MIMO Uplink

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Executive Summary

This paper investigates the impact of limited feedback on the uplink of a wireless network with multiple access points. The network adopts universal frequency re-use with each access point serving a set of users using orthogonal signalling. All wireless nodes are multiple-input-multiple-output-capable. Block Diagonalization, a popular technique for interference cancellation, is performed at each transmitter. Interference cancellation on the cell boundary is being considered in future wireless standards such as IEEE 802.16m and 3GPP Long Term Evolution Advanced. In such systems, the precoder is fed back to the mobile by its home base station. It follows that the rate achieved at the home as well as neighbouring access points is a function of the bandwidth of this feedback channel.

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