H - Electricity – 03 – H
Patent
H - Electricity
03
H
H03H 11/16 (2006.01) H03H 7/18 (2006.01) H04L 27/20 (2006.01)
Patent
CA 2051021
ABSTRACT OF THE DISCLOSURE A method of generating a composite signal in the form of a QPSK signal on which an additional carrier signal is superposed, wherein a carrier signal is conducted through two series connected, switchable phase shifters. One of the phase shifters is controlled by one of two data signals. Both data signals are logically linked with one another by a logic circuit, and the resulting linkage signal used to control the other phase shifter. The phase states into which each phase shifter can be switched are selected in such a way and the linkage signal is formed from the data signals so that, with the available values of the data signals, the carrier signal passing through the phase shifters is brought into the phase positions that should exist with the addition- al carrier signal superposed. In an advantageous arrange- ment, each phase shifter can be switched between a 0° phase state and one other phase state. The data signals are preferably linked with one another hit-by-bit in an EXOR circuit and its output used to control one phase shifter so that if the linkage signal is a logic "0", the phase shifter it controls takes on the 0° phase state and if the linkage signal is a logic "1", the phase shifter takes on the other phase state. If the data signal controlling the other phase shifter is a logic "0", this other phase shifter takes on the 0° phase state and if the data signal is a logic "1", the other phase shifter takes on the other phase state. - 1 -
Alberty Michael
Steinert Wolfgang
Ant Nachrichtentechnik G.m.b.h.
Fetherstonhaugh & Co.
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