In a time division duplex（TDD） system

the channel state information could be easily obtained at the trans-mitter side without feedback due to channel reciprocity and it could be used to increase dramatically the spectral effi-ciency of a multi-input multi-output（MIMO） system.However

the interference structure between transmission directions did not necessarily correlate at all.In such a case

the downlink modulation/coding parameters based on the uplink meas-urements might lead to excessively high frame error rates（FER）.Therefore

a simple closed-loop feedback method of in-terference adaptation was proposed

which made the transmit-side estimated interference be able to track the instantane-ous receive-side interference dynamically

and its performance in adaptive TDD MIMO-OFDM systems with HARQ was studied.Simulation results show that the tracking performance is well and the target FER requirement can be guaranteed.