phy_init_lte_ue_signal was renamed init_lte_ue_signal in openair1/PHY/INIT/defs.h maybe it's the opposite that should have been done? Functions used in one file and defined in another may have been declared in the wrong header file.
This directory contains files related to initialization of variables/structures init_top.c : initialize top-level variables and signal buffers, FFT twiddle factors, etc. lte_init.c : LTE specific initlization routines (DLSCH/ULSCH signal buffers for RX, data buffers for TX, etc.) lte_param_init.c: used only in unitary simulations. initializes the global variables eNB and UE. lte_parms.c: contains init_frame_parms to initialize frame parameters structure