Abstract: A body communication system (100) is provided which comprises a first device (110) and a second device (130). The first device (110) comprises a first body coupled communication interface (114) for forming a body communication network (170) via a body transmission channel (160) following a body of a user (150) when the first body coupled communication interface (114) is in a direct vicinity of the body of the user (150). The second device (130) comprises a second body coupled communication interface (134) for forming the body communication network (170) with the first device (110) via the body transmission channel (160) when the second body coupled communication interface (134) is in the direct vicinity of the user (150). The first and second body coupled communication interfaces (114, 134) communicate information with each other via the body transmission channel (160).

Abstract: Receivers (1) for receiving frequency signals are, to improve their time synchronization accuracy, provided with synchronization stages (20) for performing a coarse time synchronization through autocorrelating samples of a group of preamble symbols (t1,t2,t3) and a fine time synchronization through crosscorrelating samples of a further group of preamble symbols (t10,G1) with predefined samples. The synchronization stages (20) also perform a coarse and a fine frequency synchronization through detecting and accumulating phases of samples of a yet further group of preamble symbols (t8,t9) and of another group of preamble symbols (T1,T2). The synchronization stages (20) have buffering units (21) and controlling units (22) for controlling mixing units (11) and transformating units (12) in processing stages (10). The preamble symbols have ten short preamble symbols (t1-t10), a guard interval preamble symbol (G 1) and two training symbols (T 1,T2).