Diversity system

A diversity system for an angle modulated digital signal transmission utilizing a plurality of branches comprising

• a common local oscillator for generating local signals for all of said branches,
• a plurality of modulation means, each modulation means being included in one of said branches, for modulating a received periodic digital signal with one of said local signals, each said local signal having the same period as said received digital signal, and satisfying an orthogonal condition for all branches,
• a plurality of frequency mixers for mixing said received digital signal with the output of said modulation means of the respective branch,
• combining means for combining all the outputs of said frequency mixers,
• a differential detector, the input of which is connected to the output of said combining means, and
• an integrate-and-dump filter connected to the output of said differential detector.

A diversity system for an angle modulated digital signal transmission utilizing a plurality of branches comprising;

• a generator means for generating local signals,
• a plurality of modulation means provided for all branches for modulating an angle modulated periodic digital signal to be transmitted with said local signals, each said local signal having the same period as the digital signal, and satisfying an orthogonal condition for all branches,
• a plurality of transmitting means for transmitting each output of said modulating means provided at a transmission side,
• receiving means for receiving all of the branch signals provided at a reception side,
• a differential detector for detecting the output of said receiving means, and
• an integrate-and-dump filter connected to the output of said differential detector.