A barrel shifter receiving N symbols, arranged n2 distinct groups of n1 symbols, applying a circular shift to the N symbols. The barrel shifter comprises n2 first barrel shifters, each applying a first circular shift to one of the groups of n1 symbols; a rearrangement module receiving the N symbols provided by the first barrel shifters and providing N symbols arranged, in a determined manner, in n1 distinct groups of n2 symbols; n1 second barrel shifters, each applying a second circular shift to one of the distinct groups of n2 symbols; a control module providing, to each first barrel shifter, an identical signal bs_ctrl1 representing the first shift, and providing, to each second barrel shifter, an identical signal bs_ctrl2 representing the second shift; and a switching module switching at least two of the symbols of the N symbols.