Digital correlation receiver

Claim 1

In a digital correlation receiver, in particular for satellite communications transmission, in which the signal bursts, which are combined in a time division multiplex arrangement and provided with a preamble comprising a synchronizing word, from various ground stations, are time-staggered at the satellite end and, relative to the reference burst which marks the beginning of the frame, are combined to form a frame and retransmitted with time division multiple access, the combination of a shift register to which the incoming bit flow at the receiving end is supplied, comparator means to which the individual cells of the shift register are connected, and at whose second comparator inputs a logic state exists representing the synchronizing word, with which the received word in the respective shift register cells, following complete input thereof into the register, should coincide, a first group of adder stages to which is connected the respective outputs of the comparator means, a plurality of storage elements, each adder stage having a pair of outputs, respectively having the values 2 0 and 2 1 , each of which outputs is connected to a respective storage element, at least one second group of adder stages, to which outputs of said storage elements are connected in predetermined grouping, further storage elements to which the intermediate addition results of said second group of adder stages are respectively supplied, an analysis device, means for producing a data word, said means connected between said second group of adder stages and said analysis device to provide said data word as an input to said analysis device, said analysis device in the presence of a correct data word supplying a correlation signal, and timing means for controlling such shift register and the respective storage elements.