![]() Examples of OFDM-based SFN systems include digital video broadcasting-terrestrial (DVB-T), digital video broadcasting-handheld (DVB-H), digital audio broadcasting (DAB), digital multimedia broadcast-terrestrial (DMB-T) and media forward link only (Media-FLO). SFN has several advantages such as wide network coverage, excellent efficiency of frequency utilization, and the mobile user can receive the signal without switching to another frequency band in the network coverage as moving. SFN is a broadcasting network, and all transmitters transmit the same signal through the same frequency channel at the same time. The network framework of an OFDM system may be a multiple frequency network (MFN) or a single-frequency network (SFN). The OFDM modulation technology is used in wireless communication systems and digital audio and video broadcasting systems to perform high spectral efficiency transmission. Orthogonal frequency division multiplexing (OFDM) modulation technology based on multicarrier modulation is capable of resolving the problem of channel response of frequency selective fading and has thus become a mainstream technology in the application and development of wireless communication. ![]() If the multipath signal received by the receiver has a large delay spread, the coherent bandwidth of the multipath signal will be smaller than the coherent bandwidth of a single path signal, and the channel response of the multipath signal will result in frequency selective fading. Due to practical channel effects such as multipath reflection or propagation fading, the wireless signal received by the receiver may be distorted. In a wireless communication system, a transmitter is utilized to transmit a wireless signal to a receiver in the form of an electromagnetic wave through physical channels such as air. The invention relates in general to a transmission method of a wireless signal and a transmitter using the same, and more particularly to a transmission method of a wireless signal which possesses time frequency diversity and facilitates channel estimation and a transmitter using the same. 9, 2008, the subject matter of which is incorporated herein by reference. This application claims the benefit of Taiwan application Serial No.
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