Data Communication Through the Atmospheric Burst Error Channel

Simple and easily utilized techniques are suggested for reliable transmission of binary data in the presence of atmospheric noise bursts. The techniques utilize the time statistics of the noise bursts, now known to be log-normal, and operate on one-way channels. Two modes of transmission are distinguished. The first mode involves double or triple transmission of an error detection code word. The second mode of transmission is based on burst error correction, provided either by a majority count principle or by the recurrent codes of Hagelbarger. Numerical calculations indicate the superior performance of the error detection techniques

A 2-bit Adaptive Delta Modulation System with Improved Performance

A 2-bit adaptive delta modulation system with improved performance is proposed in this paper. Its main characteristic is a new adaptation algorithm that incorporates both memory and look-ahead instantaneous step-size estimation and leads the modulator into generating a 2-bit output codeword. As shown by computer simulation results, the proposed system offers reduced overshoot and fast response to signal variations in comparison to other similar systems