A method for receiving a broadcast signal in a receiver, the method comprising: receiving a first broadcast signal being transmitted through at least one of first and second transmission antennae and receiving a second broadcast signal being transmitted through at least one of first and second transmission antennae, the first broadcast signal including a first frame and the second broadcast signal including a second frame, each of the first and second frames including data symbols, a preamble symbol and an additional preamble symbol located right after the preamble symbol, wherein each of the preamble symbols in the first and second frames include P1 signaling information indicating types of the first and second frames, respectively, wherein each of the additional preamble symbols in the first and second frames include transmission parameters; detecting the preamble symbol and the additional preamble symbol of the first frame from the received first broadcast signal, and estimating a transmission channel of the first broadcast signal based on at least one of the detected preamble symbol and the detected additional preamble symbol, thereby equalizing the first broadcast signal; detecting the preamble symbol and the additional preamble symbol of the second frame from the received second broadcast signal, and estimating a transmission channel of the second broadcast signal based on at least one of the detected preamble symbol and the detected additional preamble symbol, thereby equalizing the second broadcast signal, wherein the preamble symbol includes a main part, a first part and a second part, wherein the first part carries a frequency shifted version of a part of the main part while the second part conveys a frequency shifted version of the other part of the main part, wherein (fsh) of frequency shift is applied to the first and second parts, wherein the additional preamble symbol includes an additional main part, a third part and a fourth part, wherein the third part carries a frequency shifted version of a part of the additional main part while the fourth part conveys a frequency shifted version of the other part of the additional main part, and wherein (-fsh) of frequency shift is applied to the third and fourth parts, wherein length of the first part is different from length of the third part and length of the second part is different from length of the fourth part; parsing the data symbols of the first frame in the equalized first broadcast signal and the data symbols of the second frame in the equalized second broadcast signal, and outputting Physical Layer Pipe, PLP, data; time deinterleaving the PLP data; performing Multi-input Multi-Output, MIMO, decoding on the time deinterleaved PLP data; and de-interleaving bits of the MIMO decoded PLP data. receiving a first broadcast signal being transmitted through at least one of first and second transmission antennae and receiving a second broadcast signal being transmitted through at least one of first and second transmission antennae, the first broadcast signal including a first frame and the second broadcast signal including a second frame, each of the first and second frames including data symbols, a preamble symbol and an additional preamble symbol located right after the preamble symbol, wherein each of the preamble symbols in the first and second frames include P1 signaling information indicating types of the first and second frames, respectively, wherein each of the additional preamble symbols in the first and second frames include transmission parameters; detecting the preamble symbol and the additional preamble symbol of the first frame from the received first broadcast signal, and estimating a transmission channel of the first broadcast signal based on at least one of the detected preamble symbol and the detected additional preamble symbol, thereby equalizing the first broadcast signal; detecting the preamble symbol and the additional preamble symbol of the second frame from the received second broadcast signal, and estimating a transmission channel of the second broadcast signal based on at least one of the detected preamble symbol and the detected additional preamble symbol, thereby equalizing the second broadcast signal, wherein the preamble symbol includes a main part, a first part and a second part, wherein the first part carries a frequency shifted version of a part of the main part while the second part conveys a frequency shifted version of the other part of the main part, wherein (fsh) of frequency shift is applied to the first and second parts, wherein the additional preamble symbol includes an additional main part, a third part and a fourth part, wherein the third part carries a frequency shifted version of a part of the additional main part while the fourth part conveys a frequency shifted version of the other part of the additional main part, and wherein (-fsh) of frequency shift is applied to the third and fourth parts, wherein length of the first part is different from length of the third part and length of the second part is different from length of the fourth part; parsing the data symbols of the first frame in the equalized first broadcast signal and the data symbols of the second frame in the equalized second broadcast signal, and outputting Physical Layer Pipe, PLP, data; time deinterleaving the PLP data; performing Multi-input Multi-Output, MIMO, decoding on the time deinterleaved PLP data; and de-interleaving bits of the MIMO decoded PLP data.