H - Electricity – 04 – L
Patent
H - Electricity
04
L
354/141
H04L 27/22 (2006.01)
Patent
CA 1087318
ABSTRACT A method for detecting a predetermined code word contained in received signals in a transmission system which operates with four-phase or four-phase difference modulation at the transmitter and coherent demod- ulation at the receiver and in which successive signal increments are transmitted and received during successive clock periods, the code word being transmitted only as signals in two phases which are 180 apart, and the received signals being divided into orthogonal voltage components during demodulation. The method comprises: forming a representation of the al- gebraic sum and a representation of the algebraic difference of the ortho- gonal voltage components of a received signal increment, monitoring the algebraic signs of these components and producing a first state indication when the components hare the same sign and producing a second state indica- tion when the components have respectively opposite signs; selecting the algebraic sum representation when the first state indication is produced and selecting the algebraic difference representation when the second state indication is produced; and evaluating a received signal increment in ac- cordance with the algebraic sign of the selected representation.
323775
Ekstrom Bo
Milcz Wilhelm
Steinert Wolfgang
Fetherstonhaugh & Co.
Licentia Patent-Verwaltungs-Gmbh
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