Minimum distance based precoding for closed-loop QO-STBC systems with single-symbol decodable ML receiver

In this paper, we proposes a new minimum distance based precoding scheme for closed-loop quasi-orthogonal spacetime block code (QO-STBC) systems. By utilizing the minimum Euclidean distance maximizing criterion, the proposed scheme attains the near-optimal symbol error performance, while allowing lower feedback overhead. In addition, the proposed scheme still guarantees a simple maximum likelihood detection (called single-symbol decodable). Simulation results verify that our proposed approach provides further gains compared to the conventional closed-loop systems.