Lin Wenliang

A joint encryption and error correction method used in satellite communications

Due to the ubiquitous open air links and complex electromagnetic environment in the satellite communications, how to ensure the security and reliability of the information through the satellite communications is an urgent problem. This paper combines the AES(Advanced Encryption Standard) with LDPC(Low Density Parity Check Code) to design a secure and reliable error correction method -SEEC(Satellite Encryption and Error Correction).This method selects the LDPC codes, which is suitable for satellite communications, and uses the AES round key to control the encoding process, at the same time, proposes a new algorithm of round key generation. Based on a fairly good property in error correction in satellite communications, the method improves the security of the system, achieves a shorter key size, and then makes the key management easier. Eventually, the method shows a great error correction capability and encryption effect by the MATLAB simulation.

The uncertainty entropy of low-rate speech quality evaluation and the analyses of the gray correlation

The low-rate speech quality evaluation has an obvious error for the uncertain factors with multi-source, heterogeneous and time-varying. This paper proposed a new model to measure the error of the speech quality evaluation based on entropy (SQEE). The gray correlation analysis among the factors but also the uncertain entropy was designed to keep the model optimization and equivalence. What’s more, the parameters of determinacy and sensitivity were proposed to measure the accuracy and the efficiency. After the theory and simulation, the new method enhanced the error of the traditional methods (PESQ, PQSM) about 30% below the 250ms-delay.