The Transmission Performance in HF Crypto Communication

Speech quality evaluation of traditional way is using subjective tests such as mean opinion score (MOS). The transmission performance of the characteristics of ciphered MELP encoding information is reviewed, when the information of a cipher system is transmitted over a wireless HF fading channel. As such, a designed scheme for deciding the interleaving depth over a HF environment is described, and simulations confirm that the proposed efficient algorithm with a variable interleaving depth produces a better performance using MOS test method than a static depth with a fixed interleaving depth. Experimental results showed that the bit error rate performance of the proposed efficient interleaving scheme is higher than that of the fixed interleaving depth scheme.