Significance Analysis of HVXC Speech Coding Parameters at High Frequency

Future end-to-end network delivering allows us to access anytime and anywhere to the video based multimedia contents. Ionosphere communications is part of the future network convergence and interoperability. Thus, this paper evaluates the significance of MPEG-4 coded speech parameters at a very low bit rate, 2 and 4 kbps transmitted over long distance short wave channels at high frequencies (HF) such as 20 and 30 MHz. As typical at these frequencies, it was assumed 2400 symb/s, 8-QAM, 16-QAM, 32-QAM and 64-QAM. The results show that the most significant parameter is V/UV at SNR less than 6 dB and the least significant ones are the parameters related to the unvoiced frames. Therefore, any access control, unequal error protection, data partitioning and grouping strategies covering a wide range of SNRs can then be designed based on the significance results presented in this paper. We also propose a solution to increase the error resilience of MPEG4 speech encoded signals over HF channels.