A method of processing a broadcast signal in a transmitter, the method comprising: performing Forward Error Correction, FEC, encoding on Physical Layer Pipe, PLP, data; interleaving bits of the FEC encoded PLP data; mapping the interleaved bits of the PLP data to cells of the PLP data; Multi-input Multi-Output, MIMO, processing the cells of the PLP data; time interleaving the MIMO processed cells of the PLP data; building signal frames including the time-interleaved cells of the PLP data; and OFDM modulating each signal frame, wherein the OFDM modulating includes: inserting a preamble symbol into beginning of the signal frame; and inserting an additional preamble symbol into a next position to the preamble symbol of the signal frame, wherein the preamble symbol carries transmission parameters, wherein the additional preamble symbols carries additional transmission parameters, wherein the preamble symbol includes an effective part, a first portion positioned at a front portion of the effective part and a second portion positioned at an end portion of the effective part, wherein the first portion carries a frequency shifted version of a part of the effective part while the second portion conveys a frequency shifted version of the other part of the effective part, wherein fsh of frequency shift is applied to each of the first portion and second portion, wherein the additional preamble symbol includes an additional effective part, a third portion positioned at a front portion of the additional effective part and a fourth portion positioned at an end portion of the additional effective part, wherein the third portion carries a frequency shifted version of a part of the additional effective part while the fourth portion conveys a frequency shifted version of the other part of the additional effective part, wherein -fsh of frequency shift is applied to each of the third portion and fourth portion. performing Forward Error Correction, FEC, encoding on Physical Layer Pipe, PLP, data; interleaving bits of the FEC encoded PLP data; mapping the interleaved bits of the PLP data to cells of the PLP data; Multi-input Multi-Output, MIMO, processing the cells of the PLP data; time interleaving the MIMO processed cells of the PLP data; building signal frames including the time-interleaved cells of the PLP data; and OFDM modulating each signal frame, wherein the OFDM modulating includes: inserting a preamble symbol into beginning of the signal frame; and inserting an additional preamble symbol into a next position to the preamble symbol of the signal frame, wherein the preamble symbol carries transmission parameters, wherein the additional preamble symbols carries additional transmission parameters, wherein the preamble symbol includes an effective part, a first portion positioned at a front portion of the effective part and a second portion positioned at an end portion of the effective part, wherein the first portion carries a frequency shifted version of a part of the effective part while the second portion conveys a frequency shifted version of the other part of the effective part, wherein fsh of frequency shift is applied to each of the first portion and second portion, wherein the additional preamble symbol includes an additional effective part, a third portion positioned at a front portion of the additional effective part and a fourth portion positioned at an end portion of the additional effective part, wherein the third portion carries a frequency shifted version of a part of the additional effective part while the fourth portion conveys a frequency shifted version of the other part of the additional effective part, wherein -fsh of frequency shift is applied to each of the third portion and fourth portion. inserting a preamble symbol into beginning of the signal frame; and inserting an additional preamble symbol into a next position to the preamble symbol of the signal frame, wherein the preamble symbol carries transmission parameters, wherein the additional preamble symbols carries additional transmission parameters, wherein the preamble symbol includes an effective part, a first portion positioned at a front portion of the effective part and a second portion positioned at an end portion of the effective part, wherein the first portion carries a frequency shifted version of a part of the effective part while the second portion conveys a frequency shifted version of the other part of the effective part, wherein fsh of frequency shift is applied to each of the first portion and second portion, wherein the additional preamble symbol includes an additional effective part, a third portion positioned at a front portion of the additional effective part and a fourth portion positioned at an end portion of the additional effective part, wherein the third portion carries a frequency shifted version of a part of the additional effective part while the fourth portion conveys a frequency shifted version of the other part of the additional effective part, wherein -fsh of frequency shift is applied to each of the third portion and fourth portion.