Partial Unit Memory Coding and Physical Layer Security

Cryptography and coding techniques are combined to implement most of the secure communication system. In order to use coding technique, secure communication linked by the physical layer is designed with efficient coding, which provides less security gaps. In order to design such an efficient security in the physical layer, partial unit memory code (PUM) code, is investigated with few popular codes. For the completion of research, trellis encoding and decoding techniques are used throughout the simulations. Here, (8, 6, 4) PUM and (8, 4, 4) block codes are considered but (8, 6, 4) provide better security gap than other block code even though it has a higher rate. In this analysis, not only security gap is reduced for the maximum security but also it has the ability to increase the information rate within the same bandwidth. Using this (8, 6, 4) PUM encoder and decoder, information can be sent safely through the physical layer. There is a trade-off between complexity and security gap. It is obvious because it has higher information rate than other known block code.