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In this paper, we design a resource allocation framework for thedelay-sensitive Multi-User MIMO (MU-MIMO) broadcast system with limitedfeedback. Considering the scarcity and interrelation of the transmit power andfeedback bandwidth, it is imperative to optimize the two resources in a jointand efficient manner while meeting the delay-QoS requirement. Based on theeffective bandwidth theory, we first obtain a closed-form expression of averageviolation probability with respect to a given delay requirement as a functionof transmit power and codebook size of feedback channel. By minimizing thetotal resource cost, we derive an optimal joint resource allocation scheme,which can flexibly adjust the transmit power and feedback bandwidth accordingto the characteristics of the system. Moreover, through asymptotic analysis,some simple resource allocation schemes are presented. Finally, the theoreticalclaims are validated by numerical results.

Resource Allocation for Cost Minimization in Limited Feedback MU-MIMO Systems with Delay Guarantee