Detection using block QR decomposition for MIMO HetNets

Interference management between uncoordinated eNBs and UEs is a crucial aspect of Heterogeneous Networks in LTE, especially if the interference can be exploited at the receiver. In this paper, a novel preprocessing Block QR decomposition technique is proposed for a low-complexity maxlog-MAP receiver, for interference detection in a 4×4 HetNet scenario. The authors show that for various SNR, the proposed receiver detection scheme has minimal mutual information loss for Gaussian signals for the 4×4 and 8×8 case. The proposed preprocessing method is implemented in an LTE simulation test bench with practical codes and compared with a brute-force search max-log-MAP algorithm.