Patent ID: 8121018

Claim:
A signal transmitting method in an orthogonal frequency-division multiplexing (OFDM) system, wherein the OFDM system comprises a transmitter, the signal transmitting method at least comprising: receiving and converting a serial digital signal into a plurality of OFDM symbols, wherein the OFDM symbols comprise a plurality of data symbols, a plurality of first training symbols, and a plurality of second training symbols, and the OFDM symbols align along a time sequence of one first training symbol, a number of data symbols, one second training symbol and another number of data symbols repeatedly; wherein each of the data symbols comprises a plurality of first data sub-carriers, each of the first training symbols comprises a plurality of first pilot sub-carriers, and each of the second training symbols comprise a plurality of second pilot sub-carriers and a plurality of second data sub-carriers; and wherein a number of the second pilot sub-carriers is different from a number of the first pilot sub-carriers, and every part of the second data sub-carriers is placed between two of the second pilot sub-carriers in each of the second training symbols; transforming the OFDM symbols into a plurality of time domain signals; and serializing the time domain signals into a transmitted signal and transmitting the transmitted signal.