Method and apparatus for the simultaneous transmission of separate data signals

摘要

A method of simultaneously transmitting first and second data signals by the technique of spectrum spreading by direct sequence, comprises using the first data signal to modulate a spreading code produced by a code generator from a code clock and using the second data signal to modulate the delay of the spreading code. Modulation of the spreading code delay comprises either modifying the delay of the code delivered by the code generator, or modifying the code clock frequency. Apparatus for carrying out this method is also described.