Abstract: A method of time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) communication, including the steps of: preparing OFDM-body; generating pseudo random (PN) sequence as a training signal; manipulating the PN sequence to concentrate the energy distribution thereof to the same bandwidth of sub-carriers of the OFDM-body; offsetting the manipulated PN sequence to align with frequency spectrum of the sub-carriers; and inserting the offset PN sequence as prefix of a TDS-OFDM data frame. The manipulating step may include the step of repeating the PN sequence by N times, wherein the spectrum of the repeated PN sequence concentrates on discrete bundles of sub-carriers, i.e., on one sub-carrier every N sub-carriers or M adjacent sub-carriers every MN sub-carriers, where M is an integer determined by the time duration ratio of the OFDM body and prefix.

Abstract: A method of time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) communication, including the steps of: preparing OFDM-body 402; generating pseudo random (PN) sequence 403 as a training signal; manipulating the PN sequence 403 to concentrate the energy distribution thereof to the same bandwidth of sub-carriers of the OFDM-body; offsetting the manipulated PN sequence to align with frequency spectrum of the sub-carriers 406; and inserting the offset PN sequence as prefix 401 of a TDS-OFDM data frame 400. The manipulating step may include the step of repeating the PN sequence by N times, wherein the spectrum of the repeated PN sequence concentrates on discrete bundles of sub-carriers, i.e., on one sub-carrier every N sub-carriers or M adjacent sub-carriers every MN sub-carriers, where M is an integer determined by the time duration ratio of the OFDM body and prefix..