Lattice-Aided Delay Phase Precoding for 6G THz Massive MIMO

Abstract

The future 6G wireless technology promotes applications like three-dimensional (3D) communication, extended virtual reality, digital twins, autonomous driven vehicles, etc. Such applications require tens of GHz bandwidth, such large bandwidth is promoted by Terahertz communication system. To compensate the effect of attenuation and to increase the coverage massive MIMO with traditional hybrid precoder is considered. The conventional hybrid precoder suffers from beam split effect, where the transmitted beams are oriented towards different direction leads to loss of array gain. To circumvent the array gain loss and to focus the orientation of all transmitted beams toward a particular direction a delay phase precoder (DPP) is considered. In delay phase precoding, the selected precoder is not redundant therefore consumes more power. To reduce the power consumption two lattice aided DPP namely: Boosted LLL aided DPP and Boosted KZ aided DPP were proposed. The performance in terms of array gain and data rate were plotted. The computational complexity analysis was also performed.