Signal transmission method

DETAILED DESCRIPTION The invention has the object of creating a signal transmission method in accordance with the principle of quadrature/amplitude modulation, in which method digital data occurring at a time interval T are formed into a transmit signal with the aid of pulse shapers having a given unit pulse response r(t) in a transmitter, the transmit signal is transmitted by means of a carrier oscillation via a channel having a channel unit pulse response h(t), when an additive white noise w(t) is superimposed on it, so that a receive signal y(t) is present at a receiver and the receive signal y(t) is preprocessed by channel-matched filters in the receiver, and in which an estimation of the channel is possible with a high resolution.
The way of achieving the object consists in the channel-matched filters being matched to a filter cascade H(t), formed by pulse shapers and channel as a whole.
Thus, the core of the invention lies in the fact that it is not the channel h(t) per se which is estimated but only the filter cascade H(t) formed by the pulse shaper and channel together.
If the known numeric methods are applied to this filter cascade H(t), the numeric instabilities no longer occur.
In particular, it must be noted that the instabilities do not even occur if the estimated filter cascade H(t) is convoluted with a filter r.
sup.
-1 (t), which is inverse to the pulse shaper, in order to obtain the unit pulse response h(t) of the channel itself.
Preferred embodiments of the invention are found in the subclaims.