All these files' last modified dates is 2013. I don't think anybody uses them, but they take quite a lot of space.
This directory contains unitary testbenches/Monte Carlo Simulators for physical/transport channel processing: pbchsim.c // PBCH simulation testbench pdcchsim.c // PDCCH (DCI) simulation testbench, PCFICH + PHICH too (incomplete) dlsim.c // PDSCH simulation testbench ulsim.c // PUSCH simulation testbench pucchsim.c // PUCCH simulation testbench framegen.c // eNB Frame generator