for this purpose values u03b8 0 and u03b8 1 are put in a buffer storage device 5 a fixed value storage device 6 contains matrix values u03c6 t k according to equation iii as already mentioned symbols u i of the partial sequences are known in advance so that named matrix values u03c6 t k can be calculated when implementing the receiving circuit coefficient vector h for both observation windows can thus be calculated from inverted matrix u03c6 1 according to equation ii with a calculation circuit 7 a changeover switch 8 on the output side of calculation circuit 7 is first in a switch position 8a and transfers all coefficients h 0 to a time delay element 9 thereafter it is switched to switch position 8b in which coefficients h 1 are given to multiplier 11 see fig3 and to a time delay element 13 time delay element 9 retains the coefficients for a period i 1 i 0 t t symbol duration then the coefficients of the first sampling window are transferred by a circuit 10 that forms the conjugate complex values to multiplier 11 in calculation circuit 12 m values are summed by an accumulator 16 the result is a complex.