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This paper presents an efficient construction of two-dimensional (2D)complete complementary codes (CCCs) for their modern application asomnidirectional precoding matrices in massive MIMO systems to attain enhancedcell coverage. Unlike the traditional 1D CCCs, little progress has been made onefficient and systematic constructions of the 2D counterpart. In contrast tothe existing recursive constructions with the aid of various sequenceoperations, certain 1D seed sequences or 2D arrays, we propose to use 2Dgeneralized Boolean functions for direct synthesis of 2D CCCs. Simulationresults show that the proposed 2D CCCs appear to be good candidates forprecoding matrices to achieve omnidirectional transmission in massive MIMOsystems.

Designing Two-Dimensional Complete Complementary Codes for Omnidirectional Transmission in Massive MIMO Systems