Competition Versus Cooperation on the MISO Interference Channel

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Executive Summary

The authors consider the problem of coordinating two competing multiple-antenna wireless systems (operators) that operate in the same spectral band. They formulate a rate region which is achievable by scalar coding followed by power allocation and beam-forming. They show that all interesting points on the Pareto boundary correspond to transmit strategies where both systems use the maximum available power. They then argue that there is a fundamental need for base station cooperation when performing spectrum sharing with multiple transmit antennas. More precisely, they show that if the systems do not cooperate, there is a unique Nash equilibrium which is inefficient in the sense that the achievable rate is bounded by a constant, regardless of the available transmit power.

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