Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device

A preamble symbol receiving device comprising:

• one or more processors;
• and
• a non-transitory computer readable medium storing a plurality of instructions that when executed control the one or more processors to:
• process a received signal;
• determine whether the received signal, which has been processed, contains the preamble symbol;
• and
• in response to determining that the received signal contain the preamble symbol, determine a position of the preamble symbol and resolve signalling information carried by the preamble symbol,
• wherein the preamble symbol received by the receiving and processing unit comprises at least one time-domain symbol generated by a transmitting end using a free combination of any number of first three-segment structures and second three-segment structures according to a predefined generation rule, wherein a first one of the time-domain symbols of the preamble symbol has the first three-segment structure;
• wherein the first three-segment structure containing:
• a time-domain main body signal, a prefix generated based on the entirety or a portion of the time-domain main body signal, and a postfix generated based on a portion, less than an entirety, of a partial time-domain main body signal, the length of the postfix being less than the length of the prefix;
• and
• wherein the second three-segment structure containing:
• the time-domain main body signal, a prefix generated based on the entirety or a portion of the time-domain main body signal, and a hyper prefix generated based on a portion, less than the entirety, of the partial time-domain main body signal, the length of the hyper prefix being less than the length of the prefix.