Patent ID: 8654888

Claim:
A precoder circuit used for differential phase shift keying, comprising: a plurality of levels of parallel precoder units, each of which is configured to perform a precoding operation using a data signal having a plurality of symbols and one of a fixed value and a one-symbol preceding modulated signal output from a preceding-level parallel precoder unit so as to obtain a modulated signal, precoding operations of the parallel precoder units being simultaneously performed in a parallel fashion; a plurality of levels of re-timing units configured to synchronize the modulated signals output from the parallel precoder units; and a plurality of levels of offset units, each of which is configured to add a phase difference between the fixed value and the one-symbol preceding modulated signal to the modulated signals synchronized by the re-timing units, wherein the precoder circuit is configured such that the one-symbol preceding modulated signal output from the preceding-level parallel precoder unit is input via a corresponding one of the re-timing units to a next-level parallel precoder unit.