New designs of linear-phase transmitter and receiver filters fordigital transmission systems

摘要

New solutions to the issue of designing transmitter and receivernfilters for data transmission are proposed. In this design issue, goodnfrequency selectivity, matched filter pairs, transmit, and receivenfilters with a linear phase characteristic and zero intersymholninterference (ISI) are desired. As these properties cannotnbe-simultaneously achieved, most of the previously known algorithmsnrelax the phase-linearity constraint. We show that relaxing the exactnzero-ISI or the matched filter pair provides very efficient transmit andnreceive linear phase filters with high frequency selectivity. Two designnalgorithms are described: we propose matched filter pairs with very lownISI and nonmatched filter pairs with exact zero-ISI