Enhancement of Physical Layer Security Based on NB LDPC Coded Modulation

In this work, we propose a system for joint security and error correction at the physical layer. The proposed approach combines the ideas from the area of wiretap channel coding together with a variant of the McEliece public key cryptosystem. The system makes use of randomly chosen nonbinary low-density parity-check codes with quasi-cyclic base matrices. Such a choice allows for efficient hiding of the structure of the generator matrix of the code, thus allowing for protection of the data against the eavedropper's attacks. At the same time, it also supports an efficient error correction. The analysis of the complexity of the attacks and the simulation results demonstrate the advantages of the proposed system.