A method for reducing the peak factor in a single-carrier signal transmission device, wherein the method comprises: • a first step of grouping symbols to be transmitted in blocks, the symbols to be transmitted being modulated by a 16QAM modulation, and, for each of the blocks of symbols to be transmitted: ∘ a second step of generating (103, 110) a single-carrier signal from said block of symbols to be transmitted, ∘ a third step of clipping said single-carrier signal derived from the second step according to a technique called deep clipping, ∘ a fourth step of generating (130, 104) a block of clipped symbols from said clipped single-carrier signal computed in the third step, ∘ a fifth step of generating a block of modified symbols from said block of clipped symbols of the first step, by defining a constraint zone around each symbol of the block of symbols to be transmitted such that the Euclidian distance, along the real axis and the imaginary axis respectively, or in terms of absolute value, between the symbols of the constraint zone and the corresponding symbol to be transmitted is lower than or equal to a non-zero maximum Euclidian distance, the modified symbols corresponding to the clipped symbols when they are located in the constraint zone of the corresponding symbol to be transmitted, and, when they are not, corresponding to the movement of the clipped symbol up to the closest position of the constraint zone of the corresponding symbol to be transmitted, ∘ a sixth step of generating and transmitting a single-carrier signal from said block of modified symbols computed in the fifth step, the second, third, fourth and fifth steps being performed iteratively, said block of symbols used in the second step of the iteration n being said block of modified symbols computed in the fifth step of the iteration n-1 from the second iteration. • a first step of grouping symbols to be transmitted in blocks, the symbols to be transmitted being modulated by a 16QAM modulation, and, for each of the blocks of symbols to be transmitted: ∘ a second step of generating (103, 110) a single-carrier signal from said block of symbols to be transmitted, ∘ a third step of clipping said single-carrier signal derived from the second step according to a technique called deep clipping, ∘ a fourth step of generating (130, 104) a block of clipped symbols from said clipped single-carrier signal computed in the third step, ∘ a fifth step of generating a block of modified symbols from said block of clipped symbols of the first step, by defining a constraint zone around each symbol of the block of symbols to be transmitted such that the Euclidian distance, along the real axis and the imaginary axis respectively, or in terms of absolute value, between the symbols of the constraint zone and the corresponding symbol to be transmitted is lower than or equal to a non-zero maximum Euclidian distance, the modified symbols corresponding to the clipped symbols when they are located in the constraint zone of the corresponding symbol to be transmitted, and, when they are not, corresponding to the movement of the clipped symbol up to the closest position of the constraint zone of the corresponding symbol to be transmitted, ∘ a sixth step of generating and transmitting a single-carrier signal from said block of modified symbols computed in the fifth step, ∘ a second step of generating (103, 110) a single-carrier signal from said block of symbols to be transmitted, ∘ a third step of clipping said single-carrier signal derived from the second step according to a technique called deep clipping, ∘ a fourth step of generating (130, 104) a block of clipped symbols from said clipped single-carrier signal computed in the third step, ∘ a fifth step of generating a block of modified symbols from said block of clipped symbols of the first step, by defining a constraint zone around each symbol of the block of symbols to be transmitted such that the Euclidian distance, along the real axis and the imaginary axis respectively, or in terms of absolute value, between the symbols of the constraint zone and the corresponding symbol to be transmitted is lower than or equal to a non-zero maximum Euclidian distance, the modified symbols corresponding to the clipped symbols when they are located in the constraint zone of the corresponding symbol to be transmitted, and, when they are not, corresponding to the movement of the clipped symbol up to the closest position of the constraint zone of the corresponding symbol to be transmitted, ∘ a sixth step of generating and transmitting a single-carrier signal from said block of modified symbols computed in the fifth step,