Abstract:

The different propagation times due to the distinct distance between the BSs and MSs result in intercell asynchronous interference, which severely destroy system performance. How to mitigate intercell asynchronous interference by making use of SLNR（Signal to Leakage Noise Ratio） precoding is the key to this paper. A framework of CoBS(Cooperative Base Station Systems) was developed and the delay between the cells was analyzed. A delaytolerance SLNR precoding was brought forward in LTE（Long Term Evolution） system  to suppress intercell asynchronous interference. And this method can also reduce the complication of terminal. The numerical delaytolerance SLNR precoding simulation results are presented based on cooperative base station LTE systems, the conclusions show that it can mitigate intercell asynchronous interference. And the method can reach a good performance under different antenna configuration compared with receive algorithm.The performance is affected by channel estimation error, but it can still be accepted.

Key words: multiinput multioutput（MIMO）, cooperative base station systems(Co-BS), precoding, signal to leakage noise ratio(SLNR), asynchronous interference