A Feedback Update Control Scheme for Limited Feedback Multiple Antennas Systems

Allowing the receiver in a multiple antenna wireless system to send a limited amount of Channel State Information (CSI) feedback is an effective way to enable channel adaptive signaling. This paper addresses the problem of controlling the feedback update period and feedback rate of limited feedback multiple antennas systems in temporally correlated channels. The challenge in the authors' problem is how to assign the feedback update period and feedback rate subject to a constraint on feedback overhead. The presented approach analyzes the required CSI feedback rate and feedback update period by maximizing a lower bound on the average normalized effective signal-to-noise ratio.