Research On MIMO Receiver In The Downlink Of LTE

The long term evolution (LTE) of UTRAN is the new technical research and development project which is started by 3GPP in recent two years. It improved and enhanced the 3G air interface technology and used OFDM and MIMO as the only standard of its wireless network evolution.The MIMO receiver algorithms in the downlink of LTE is studied and discussed in datial in this thesis. The LTE downlink transmit diversity has used the space frequency block coding (SFBC). As a result of the orthogonality of the SFBC, the receiver usually uses the simple linear Combining (maximal ratio combining, MRC), but this method does not consider inter cell interference(ICI), in the OFDM system, the problem of ICI is more serious. In the thesis, a kind of multi-antenna combining algorithm -IRC(Interference Rejection Combining) which is able to estimate the statistical property of the interference, thus suppress the interference is studied. Based on the introduction of the principle of the IRC and SFBC, we analyzed the principle and implementation program of the algorithm under many kinds of scenes for the LTE downlink SFBC diversity technology theoretically, and gave the improvement measure, at the same time, we made comparison with the classical MRC and gave the simulation confirmation. We simulated the performance of the algorithms under each kind of scene dicussed in the thesis and different modulation types and code rates. The simulation result indicated that IRC algorithm has a good inhibitory effect on interference, especially in the single interference condition, its performance gain is very big, and the improvement measure also has certain performance promotion compared with the original method.