System performance of three cell network with corner users using precoding, interference alignment and quantized limited channel feedback
DOI:
https://doi.org/10.3103/S0735272722070020Abstract
Users in the common corner of a three-cell downlink multi-user MIMO system suffer from low signal strength from their own cell as well as equal strength interference signal from their neighbour two cells. The schemes for interference mitigation are adopted to improve system sum-rate performance in this scenario. Further, the full CSI feedback by users to their base station puts high burden on the reverse feedback channel. Quantized reduced channel information feedback with interference alignment technique and suitable precoding can reduce the burden on the reverse channel as well as they can improve the system sum-rates. The LTE code book based precoding techniques provide improvements in the sum-rate. We design precoding using singular value decomposition (SVD) on the selected code vectors based on maximization of Equivalent Channel-Code vector (SVD-ECC) and maximization of SINR-Code vector (SVD-SINRC). Both these techniques show system sum-rate improvement over ZF based precoding technique, SVD-ECC providing more improvements than SVD-SINRC. We also experiment with users with orthogonal equivalent channels and the subsequent SVD on the selected users channel (SVD-ORT). We show results varying user SNR, number of selected user K and the total number of active user L in a cell.
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