Data transmission method and apparatus for use in low BW:Rs applications

摘要

A data transmission scheme for use in a low channel bandwidth-to-modulation symbol rate ratio (BW:RS) application employing a linear modulator for producing in-phase and quadrature (I and Q) components of a data stream inputted at a predetermined symbol rate. This transmission method allows for the recovery of signals having unfavorable delay spread characteristics. That is, a specialized function is used to process the I and Q components, whose time domain transfer characteristic remains within a predetermined range of a data constellation point for a duration that exceeds 25 percent of a symbol period corresponding to the predetermined symbol rate. The processed response is then band-limited to produce a modulation signal that is usable in the low BW:RS application.