Signal acceptability criteria

The detailed study of interference of unwanted radio signals having arbitrary modulation, with a specified co-channel signal carrying the desired intelligence, forms the basis for this paper. Detailed information about the modulation characteristics, as well as the transfer function of the receiver from antenna to output channel, are needed in order to predict acceptance ratios, or what this author has called TSI ratios. In some cases, masking of one intelligence by another needs to be taken into account, in others, beat note interference is the prime culprit, while in still others, the mechanism is far more complex. Representative TSI ratios are deduced and presented for a large number of systems, but the set of figures is by no means complete.