Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses

The present invention provides a method for generating a preamble symbol, a method for receiving a preamble symbol, a related method for generating a frequency domain symbol, and apparatuses thereof. The methods are characterized by comprising: generating a cyclic prefix according to an extracted part of a time domain main signal; generating a modulation signal according to the whole or a part of the extracted part of the time domain main signal; and generating time domain symbols according to at least one of the cyclic prefix, the time domain main signal and the modulation signal, the preamble symbol comprising at least one of the time domain symbols. Therefore, when the prefix is generated according to the whole or a part of a certain length of the time domain main signal, coherent detection can be implemented, which solves the problems of degradation of non-coherent detection performance and differential decoding failure under a complex frequency selective fading channel, and when the modulation signal serving as a suffix is generated according to the whole or a part of the extracted time domain main signal, the generated preamble symbol has good fractional frequency offset estimating performance and timing synchronization performance.