Special Section on Cooperative Communications for Cellular Networks
Gain Matrix Design Method to Ensure Reciprocity in TDD MIMO Relay Systems
2011 Volume E94.B Issue 12 Pages 3395-3398
Details
2011 Volume E94.B Issue 12 Pages 3395-3398
This letter reveals that whole link reciprocity does not exist in general amplify-and-forward (AF) time division duplex (TDD) relay systems due to the gain matrix. To resolve this problem, a novel gain matrix design method is proposed. Any existing gain matrix design criterion can be adopted in the downlink (uplink) to ensure optimal performance, and the proposed scheme is used in the uplink (downlink), with small adjustment, to keep whole link reciprocity. Simulation results show that, the proposed method can maintain whole link reciprocity without performance loss.
