ASIP implementation of a low complexity iterative BD precoder for MU-MIMO system

In this paper, we propose a low complexity MU(multi-user)-MIMO precoder and show its ASIP (application specific instruction-set processor) implementation result. To realize DL(downlink)-MU-MIMO transmission, the MU-MIMO precoder is required in AP (access point) side for canceling an IUI (inter-user interference). However, a conventional IBD (iterative block diagonalization) precoder has a high computational complexity problem. Therefore, we propose a LC(low complexity)-IBD precoder whose complexity is reduced by using null vectors from CSI (channel state information) decompression process. The implementation result shows that our precoder can reduce computational complexity and latency.