Verfahren und Schaltungsanordnung zur verbesserten Datenübertragung

摘要

The invention relates to a method and a circuit arrangement for efficient use of multistage modulation methods using orthogonal base functions for the representation of a signal to be transmitted. A 16-QAM signal constellation can be used, for instance, in a simple and optimal way, for transmitting at low data rates. The circuit arrangement corresponding to said method comprises a source (1) which supplies a data stream (2) and is connected to a code converter (3) for converting the data stream. The output of the code converter (3) is connected to a modulator (4) in which the corresponding signal points are selected with the right probability. The data stream (2) is then transmitted over a channel (5), and a demodulator (6) situated downstream from a code converter (7) carries out the inverse operation.