Some embodiments relate to an encoder (830) comprising a differential encoder (810) operable to provide a differentially encoded signal (811) based on an input signal (105) and a differential encoding rule; and an LDPC encoder (806) operable to provide an LDPC encoded signal (807) based on the differentially encoded signal (811) and based on an LDPC encoding rule corresponding to an M'S × N'S parity check matrix ( H ') comprising a plurality of S × S permutation sub-matrices with an even number of non-zero entries in each row of an S × S sub-matrix. Further embodiments relate to a decoder (840) comprising an LDPC decoder (822) operable to provide an output signal (823) based on an input signal (821) and based on an LDPC decoding rule corresponding to an M'S × N'S parity check matrix ( H ') comprising a plurality of S × S permutation sub-matrices with an even number of non-zero entries in each row of an S × S sub-matrix; and a differential decoder (818) operable to provide a decoded signal (819) based on the output signal (823) from the LDPC decoder (822) and a differential decoding rule.