A Time Domain Tracking Method for Limited-Rate Feedback Precoding in MIMO Systems

In this paper, a novel time domain tracking approach with limited-rate feedback is proposed. It can reduce the feedback rate by tracking the precoding matrices on Grassmann manifold according to the time domain correlation feature of channel fading. And the main idea of the proposed approach is to adjust the feedback overhead to the varying of channel fading adaptively. It makes sure that the optimal precoding matrices can be chosen by the precoder. Therefore, the degradation of performance can be neglected. The contribution of this paper is to propose an adaptive tracking algorithm on time domain. Compared with the limited feedback precoding, the proposed algorithm can reduce the feedback overhead to the half. In this paper, auto-regressive model is used for temporal correlative channel. Moreover, the numerical simulation results have been demonstrated and some critical factors have been analyzed.