Prediction-Based Minimum Rate Maximization Link Adaptation Strategy Revisited

Minimum rate maximization (MRM) is a link adaptation strategy for CDMA-based systems such as UMTS. It offers to all users on the uplink a minimum QoS, in terms of a target signal-to-interference-plus-noise ratio (SINR), regardless of their respective fadings. This is achieved by appropriate power and rate allocation that maximizes the minimum user information rate. Auto-regressive channel prediction was proposed to improve MRM robustness to imperfect channel knowledge. The prediction yields better average minimum SINR. However, this enhancement is limited by the channel estimation errors. This paper proposes a new channel gain estimator and shows that the prediction error variance is minimized for a given AR order